diff --git a/build.sh b/build.sh
index 1dfdb9b0b..79555a24f 100755
--- a/build.sh
+++ b/build.sh
@@ -1,731 +1,731 @@
-#!/bin/bash
-
-#
-# KLayout Layout Viewer
-# Copyright (C) 2006-2021 Matthias Koefferlein
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-#
-
-CURR_DIR=`pwd`
-RUN_MAKE=1
-IS_MAC="no"
-IS_WINDOWS="no"
-IS_LINUX="no"
-
-HAVE_QTBINDINGS=1
-HAVE_QT_UITOOLS=1
-HAVE_QT_NETWORK=1
-HAVE_QT_SQL=1
-HAVE_QT_SVG=1
-HAVE_QT_PRINTSUPPORT=1
-HAVE_QT_MULTIMEDIA=1
-HAVE_QT_DESIGNER=1
-HAVE_QT_XML=1
-HAVE_64BIT_COORD=0
-HAVE_QT=1
-HAVE_QT5="" # not set
-HAVE_CURL=0
-HAVE_EXPAT=0
-
-RUBYINCLUDE=""
-RUBYINCLUDE2=""
-RUBYLIBFILE=""
-RUBYVERSIONCODE=""
-
-PYTHONINCLUDE=""
-PYTHONLIBFILE=""
-PYTHONEXTSUFFIX=""
-
-QMAKE=""
-RUBY=""
-PYTHON=""
-BUILD=""
-BIN=""
-RPATH=""
-
-MAKE_OPT=""
-
-CONFIG="release"
-BUILD_EXPERT=0
-
-# Check if building on Mac OSX Darwin family
-case `uname` in
-    Linux*)
-        IS_LINUX="yes"
-        ;;
-    MINGW*)
-        IS_WINDOWS="yes"
-        ;;
-    CYGWIN*)
-        IS_WINDOWS="yes"
-        ;;
-    Darwin*)
-        IS_MAC="yes"
-        ;;
-    *)
-        ;;
-esac
-
-# Check, whether build.sh is run from the top level folder
-if ! [ -e src ] || ! [ -e src/klayout.pro ]; then
-  echo "*** ERROR: run build.sh from the top level folder"
-  exit 1
-fi
-
-while [ "$*" != "" ]; do
-
-  a=$1
-  shift
-
-  case $a in
-  -without-qt)
-    HAVE_QT=0
-    ;;
-  -with-qtbinding)
-    HAVE_QTBINDINGS=1
-    ;;
-  -without-qtbinding)
-    HAVE_QTBINDINGS=0
-    ;;
-  -without-qt-uitools)
-    HAVE_QT_UITOOLS=0
-    ;;
-  -without-qt-network)
-    HAVE_QT_NETWORK=0
-    ;;
-  -without-qt-sql)
-    HAVE_QT_SQL=0
-    ;;
-  -without-qt-svg)
-    HAVE_QT_SVG=0
-    ;;
-  -without-qt-printsupport)
-    HAVE_QT_PRINTSUPPORT=0
-    ;;
-  -without-qt-multimedia)
-    HAVE_QT_MULTIMEDIA=0
-    ;;
-  -without-qt-designer)
-    HAVE_QT_DESIGNER=0
-    ;;
-  -without-qt-xml)
-    HAVE_QT_XML=0
-    ;;
-  -with-64bit-coord)
-    HAVE_64BIT_COORD=1
-    ;;
-  -without-64bit-coord)
-    HAVE_64BIT_COORD=0
-    ;;
-  -release)
-    CONFIG="release"
-    ;;
-  -debug)
-    CONFIG="debug"
-    ;;
-  -expert)
-    BUILD_EXPERT=1
-    ;;
-  -python)
-    PYTHON="$1"
-    shift
-    ;;
-  -nopython)
-    PYTHON="-"
-    ;;
-  -pyinc)
-    PYTHONINCLUDE="$1"
-    shift
-    ;;
-  -pylib)
-    PYTHONLIBFILE="$1"
-    shift
-    ;;
-  -pyextsuffix)
-    PYTHONEXTSUFFIX="$1"
-    shift
-    ;;
-  -qmake)
-    QMAKE="$1"
-    shift
-    ;;
-  -ruby)
-    RUBY="$1"
-    shift
-    ;;
-  -noruby)
-    RUBY="-"
-    ;;
-  -rbvers)
-    RUBYVERSIONCODE="$1"
-    shift
-    ;;
-  -rbinc)
-    RUBYINCLUDE="$1"
-    shift
-    ;;
-  -rbinc2)
-    RUBYINCLUDE2="$1"
-    shift
-    ;;
-  -rblib)
-    RUBYLIBFILE="$1"
-    shift
-    ;;
-  -build)
-    BUILD="$1"
-    shift
-    ;;
-  -bin|-prefix)
-    BIN="$1"
-    shift
-    ;;
-  -rpath)
-    RPATH="$1"
-    shift
-    ;;
-  -qt4)
-    HAVE_QT5=0
-    ;;
-  -qt5)
-    HAVE_QT5=1
-    ;;
-  -dry-run)
-    RUN_MAKE=0
-    ;;
-  -libcurl)
-    HAVE_CURL=1
-    ;;
-  -libexpat)
-    HAVE_EXPAT=1
-    ;;
-  -option)
-    MAKE_OPT="$MAKE_OPT $1"
-    shift
-    ;;
-  -h|--help|-help)
-    echo "usage: build [options]"
-    echo ""
-    echo "options:"
-    echo ""
-    echo "  -debug                Run a debug build"
-    echo "  -release              Run a release build [default]"
-    echo ""
-    echo "  -qmake <prog>         Use qmake 'prog'"
-    echo ""
-    echo "  -noruby               Don't build with Ruby support"
-    echo "  -ruby <prog>          Use Ruby interpreter 'prog'"
-    echo ""
-    echo "  -nopython             Don't build with Python support"
-    echo "  -python <prog>        Use Python interpreter 'prog'"
-    echo ""
-    echo "  -build <path>         Directory where to do the build"
-    echo "  -bin|-prefix <path>   Directory where to install the binary"
-    echo "  -rpath <rpath>        Specifies the RPATH to use (default: same as -bin)"
-    echo "  -option <option>      'make' options (i.e. -j2)"
-    echo ""
-    echo "  -with-qtbinding       Create Qt bindings for ruby scripts [default]"
-    echo "  -without-qtbinding    Don't create Qt bindings for ruby scripts"
-    echo "  -without-qt-uitools   Don't include uitools in Qt binding"
-    echo "  -with-64bit-coord     Use long (64bit) coordinates - EXPERIMENTAL FEATURE"
-    echo "                          (only available for gcc>=4.4 for 64bit build)"
-    echo "  -without-64bit-coord  Don't use long (64bit) coordinates [default]"
-    echo "  -without-qt           Qt-less build of the core libraries (including pymod)"
-    echo "                          (implies -without-qtbinding)"
-    echo ""
-    echo "  -dry-run              Don't build, just run qmake"
-    echo ""
-    echo "Special options (usually auto-selected from ruby/python/Qt installation):"
-    echo ""
-    echo "  -qt4|-qt5             Use Qt4 or Qt5 API [default: auto detect]"
-    echo ""
-    echo "  -rblib <file>         Location of the .so/.dll to link for Ruby support"
-    echo "  -rbinc <dir>          Location of the Ruby headers (in particular 'ruby.h')"
-    echo "                          -rbinc and -rblib must be set to enable Ruby support"
-    echo "  -rbinc2 <dir>         Second include path for Ruby 1.9 (containing 'ruby/config.h')"
-    echo "  -rbvers <xyyzz>       Ruby version code"
-    echo ""
-    echo "  -pylib <file>         Location of the .so/.dll to link for Python support"
-    echo "  -pyinc <dir>          Location of the Python headers (in particular 'Python.h')"
-    echo ""
-    echo "  -libcurl              Use libcurl instead of QtNetwork (for Qt<4.7)"
-    echo "  -libexpat             Use libexpat instead of QtXml"
-    echo ""
-    echo "Environment Variables:"
-    echo ""
-    echo "  QMAKE_CCACHE=1        Adds CONFIG+=ccache to qmake command (only works if Qt>=5.9.2)"
-    echo ""
-    exit 0
-    ;;
-  *)
-    MAKE_OPT="$MAKE_OPT $a"
-    ;;
-  esac
-
-done
-
-echo "Scanning installation .."
-echo ""
-
-# Import version info
-. ./version.sh
-
-echo "Version Info:"
-echo "    Version: $KLAYOUT_VERSION"
-echo "    Date: $KLAYOUT_VERSION_DATE"
-echo "    Revision: $KLAYOUT_VERSION_REV"
-echo ""
-
-# if not given, try to detect the qmake binary
-if [ "$QMAKE" = "" ]; then
-  for qmake in "qmake5" "qmake-qt5" "qmake4" "qmake-qt4" "qmake"; do
-    if [ "$QMAKE" = "" ] && [ "`$qmake -v 2>/dev/null`" != "" ]; then
-      QMAKE="$qmake"
-    fi
-  done
-fi
-if [ "$QMAKE" = "" ]; then
-  echo "*** ERROR: unable to find qmake tool in path"
-  exit 1
-fi
-
-# if not given, try to detect the qt major version to use
-if [ "$HAVE_QT5" = "" ]; then
-  qt_major=`$QMAKE -v | grep 'Using Qt version' | sed 's/.*version  *\([0-9][0-9]*\).*/\1/'`
-  if [ "$qt_major" = "4" ]; then
-    HAVE_QT5=0
-  elif [ "$qt_major" = "5" ]; then
-    HAVE_QT5=1
-  else
-    echo "*** ERROR: could not determine Qt version from '$QMAKE -v'"
-    exit 1
-  fi
-fi
-
-echo "Using qmake: $QMAKE"
-echo ""
-
-# if not given, locate ruby interpreter (prefer 1.9, then default, finally 1.8 as fallback)
-if [ "$RUBY" = "" ]; then
-  for ruby in "ruby2.4" "ruby2.3" "ruby2.2" "ruby2.1" "ruby2" "ruby1.9" "ruby" "ruby1.8"; do
-    if [ "$RUBY" = "" ] && [ "`$ruby -e 'puts 1' 2>/dev/null`" = "1" ]; then
-      RUBY="$ruby"
-    fi
-  done
-fi
-if [ "$RUBY" != "" ] && [ "$RUBY" != "-" ]; then
-
-  echo "Using Ruby interpreter: $RUBY"
-
-  if [ "`$RUBY -e 'puts 1' 2>/dev/null`" != "1" ]; then
-    echo "*** ERROR: unable to run Ruby interpreter $RUBY"
-    exit 1
-  fi
-
-  # Get ruby version
-  if [ "$RUBYVERSIONCODE" = "" ]; then
-    RUBYVERSIONCODE=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['MAJOR'] || 0).to_i*10000+(RbConfig::CONFIG['MINOR'] || 0).to_i*100+(RbConfig::CONFIG['TEENY'] || 0).to_i"`
-  fi
-
-  # Get ruby installation files
-  if [ "$RUBYLIBFILE" = "" ]; then
-    RUBYLIBFILENAME=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['LIBRUBY'] || '')"`
-    RUBYLIBFILENAME_SO=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['LIBRUBY_SO'] || '')"`
-    RUBYLIBFILENAME_A=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['LIBRUBY_A'] || '')"`
-    if [ "$RUBYLIBFILENAME_A" = "" ] && [ "$RUBYLIBFILENAME_SO" = "" ] && [ "RUBYLIBFILENAME" = "" ]; then
-      echo "*** WARNING: Could not get Ruby library name"
-    else
-      RUBYLIBFILEPATH=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['archlibdir'] || '')"`
-      if [ "$RUBYLIBFILEPATH" = "" ] || ! [ -e "$RUBYLIBFILEPATH" ]; then
-        RUBYLIBFILEPATH=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['libdir'] || '')"`
-      fi
-      if [ "$RUBYLIBFILEPATH" = "" ]; then
-        echo "*** WARNING: Could not get Ruby library path"
-      elif [ -f "$RUBYLIBFILEPATH/$RUBYLIBFILENAME" ]; then
-        RUBYLIBFILE="$RUBYLIBFILEPATH/$RUBYLIBFILENAME"
-        echo "    Ruby library found: $RUBYLIBFILE"
-      elif [ -f "$RUBYLIBFILEPATH/$RUBYLIBFILENAME_SO" ]; then
-        RUBYLIBFILE="$RUBYLIBFILEPATH/$RUBYLIBFILENAME_SO"
-        echo "    Ruby library found: $RUBYLIBFILE"
-      elif [ -f "$RUBYLIBFILEPATH/$RUBYLIBFILENAME_A" ]; then
-        RUBYLIBFILE="$RUBYLIBFILEPATH/$RUBYLIBFILENAME_A"
-        echo "    Ruby library found: $RUBYLIBFILE"
-      else
-        echo "*** WARNING: Could not locate Ruby library"
-        echo "    Candidates are:"
-        echo "      $RUBYLIBFILEPATH/$RUBYLIBFILENAME"
-        echo "      $RUBYLIBFILEPATH/$RUBYLIBFILENAME_SO"
-        echo "      $RUBYLIBFILEPATH/$RUBYLIBFILENAME_A"
-        echo "    (none of them could be found)"
-      fi
-    fi
-  fi
-
-  if [ "$RUBYLIBFILE" != "" ]; then
-    RUBYHDRDIR=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['rubyhdrdir'] || '')"`
-    if [ "$RUBYHDRDIR" = "" ]; then
-      if [ "$RUBYINCLUDE" = "" ]; then
-        RUBYINCLUDE=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['archdir'] || '')"`
-      fi
-      echo "    Ruby headers found: $RUBYINCLUDE"
-    else
-      if [ "$RUBYINCLUDE" = "" ]; then
-        RUBYINCLUDE="$RUBYHDRDIR"
-      fi
-      if [ "$RUBYINCLUDE2" = "" ]; then
-        RUBYINCLUDE2=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['rubyarchhdrdir'] || '')"`
-      fi
-      if [ "$RUBYINCLUDE2" = "" ]; then
-        RUBYINCLUDE2="$RUBYHDRDIR"/`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['arch'] || '')"`
-      fi
-      echo "    Ruby headers found: $RUBYINCLUDE and $RUBYINCLUDE2"
-    fi
-  fi
-
-  echo "    Ruby installation is in:"
-  echo "    - $RUBYLIBFILE (lib)"
-  echo "    - $RUBYINCLUDE (headers)"
-  echo "    - $RUBYINCLUDE2 (arch headers)"
-  echo "    Ruby version code is $RUBYVERSIONCODE"
-  echo ""
-
-fi
-
-# if not given, locate Python interpreter
-if [ "$PYTHON" = "" ]; then
-  for python in "python3.5" "python3.4" "python3.3" "python3.2" "python3.1" "python3" "python2.8" "python2.7" "python2" "python"; do
-    if [ "$PYTHON" = "" ] && [ "`$python -c 'print(1)' 2>/dev/null`" = "1" ]; then
-      PYTHON="$python"
-    fi
-  done
-fi
-if [ "$PYTHON" != "" ] && [ "$PYTHON" != "-" ]; then
-
-  echo "Using Python interpreter: $PYTHON"
-
-  if [ "`$PYTHON -c 'print(1)' 2>/dev/null`" != "1" ]; then
-    echo "*** ERROR: unable to run Python interpreter $PYTHON"
-    exit 1
-  fi
-
-  # Get Python installation files
-  if [ "$PYTHONLIBFILE" = "" ]; then
-    PYTHONLIBFILENAME=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('LDLIBRARY')[0])" 2>/dev/null`
-    if [ "$PYTHONLIBFILENAME" = "" ]; then
-      PYTHONLIBFILENAME=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('LIBRARY')[0])" 2>/dev/null`
-    fi
-    if [ "$PYTHONLIBFILENAME" = "" ]; then
-      PYTHONLIBFILENAME=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('LDLIBRARY')[0])" 2>/dev/null`
-    fi
-    if [ "$PYTHONLIBFILENAME" = "" ]; then
-      PYTHONLIBFILENAME=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('LIBRARY')[0])" 2>/dev/null`
-    fi
-    if [ "$PYTHONLIBFILENAME" = "" ]; then
-      echo "*** WARNING: Could not get Python library name"
-    else
-      PYTHONLIBFILEPATH=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('LIBDIR')[0])" 2>/dev/null`
-      if [ "$PYTHONLIBFILEPATH" = "" ]; then
-        PYTHONLIBFILEPATH=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('LIBDIR')[0])" 2>/dev/null`
-      fi
-      if [ "$PYTHONLIBFILEPATH" = "" ]; then
-        echo "*** WARNING: Could not get Python library path"
-      else
-        PYTHONLIBFILE="$PYTHONLIBFILEPATH/$PYTHONLIBFILENAME"
-        if [ ! -f "$PYTHONLIBFILE" ]; then
-          echo "    INFO: Python library not in default path, trying to use MULTIARCH"
-          PYTHONMULTIARCH=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('MULTIARCH')[0])" 2>/dev/null`
-          PYTHONLIBFILE="$PYTHONLIBFILEPATH/$PYTHONMULTIARCH/$PYTHONLIBFILENAME"
-        fi
-        echo "    Python library found: $PYTHONLIBFILE"
-      fi
-    fi
-  fi
-
-  if [ "$PYTHONINCLUDE" = "" ]; then
-    PYTHONINCLUDE=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('INCLUDEPY')[0])" 2>/dev/null`
-    if [ "$PYTHONINCLUDE" = "" ]; then
-      PYTHONINCLUDE=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('INCLUDEPY')[0])" 2>/dev/null`
-    fi
-    echo "    Python headers found: $PYTHONINCLUDE"
-  fi
-
-  if [ "$PYTHONEXTSUFFIX" = "" ]; then
-    PYTHONEXTSUFFIX=$($PYTHON -c "import sysconfig; print(sysconfig.get_config_var('EXT_SUFFIX') or sysconfig.get_config_var('SO'))" 2>/dev/null)
-    if [ "$PYTHONEXTSUFFIX" = "" ]; then
-      if [ "$IS_WINDOWS" = "yes" ]; then
-        PYTHONEXTSUFFIX=.dll
-      elif [ "$IS_MAC" = "yes" ]; then
-        PYTHONEXTSUFFIX=.dylib
-      else
-        PYTHONEXTSUFFIX=.so
-      fi
-    fi
-    echo "    Python extension suffix: $PYTHONEXTSUFFIX"
-  fi
-
-  echo "    Python installation is in:"
-  echo "    - $PYTHONLIBFILE (lib)"
-  echo "    - $PYTHONINCLUDE (includes)"
-  echo ""
-
-fi
-
-if [ $HAVE_QT = 0 ]; then
-  HAVE_QTBINDINGS=0
-fi
-
-echo "Features:"
-if [ $HAVE_QT = 0 ]; then
-  echo "    Qt not used at all"
-fi
-if [ $HAVE_QTBINDINGS != 0 ]; then
-  if [ "$HAVE_QT5" != "0" ]; then
-    echo "    Qt bindings enabled (Qt 5 API)"
-  else
-    echo "    Qt bindings enabled (Qt 4 API)"
-  fi
-fi
-if [ $HAVE_64BIT_COORD != 0 ]; then
-  echo "    64 bit coordinates enabled"
-fi
-if [ $HAVE_EXPAT != 0 ]; then
-  echo "    Uses libexpat for XML parsing"
-fi
-if [ $HAVE_CURL != 0 ]; then
-  echo "    Uses libcurl for network access"
-fi
-if [ "$RPATH" = "" ]; then
-  RPATH="$BIN"
-fi
-
-# Check Ruby installation
-if [ "$RUBYINCLUDE" != "" ]; then
-  HAVE_RUBY=1
-  if [ "$RUBYLIBFILE" = "" ]; then
-    echo "*** ERROR: -rblib not specified or library path cannot be determined from Ruby installation"
-    exit 1
-  fi
-  if [ "$RUBYVERSIONCODE" = "" ]; then
-    echo "*** ERROR: -rbvers not specified or version cannot be determined from Ruby installation"
-    exit 1
-  fi
-  if [ ! -f "$RUBYINCLUDE/ruby.h" ]; then
-    echo "*** ERROR: wrong -rbinc path: $RUBYINCLUDE/ruby.h does not exist or is not a file"
-    exit 1
-  fi
-  if [ "$RUBYINCLUDE2" != "" ] && [ ! -f "$RUBYINCLUDE2/ruby/config.h" ]; then
-    echo "*** ERROR: wrong -rbinc2 path: $RUBYINCLUDE2/ruby/config.h does not exist or is not a file"
-    exit 1
-  fi
-  if [ ! -f "$RUBYLIBFILE" ]; then
-    echo "*** ERROR: wrong -rblib path: $RUBYLIBFILE does not exist or not a file"
-    exit 1
-  fi
-else
-  HAVE_RUBY=0
-fi
-
-# Check Python installation
-if [ "$PYTHONINCLUDE" != "" ]; then
-  HAVE_PYTHON=1
-  if [ "$PYTHONLIBFILE" = "" ]; then
-    echo "*** ERROR: -pylib not specified or library path cannot be determined from Python installation"
-    exit 1
-  fi
-  if [ ! -f "$PYTHONINCLUDE/Python.h" ]; then
-    echo "*** ERROR: wrong -pyinc path: $PYTHONINCLUDE/Python does not exist or is not a file"
-    exit 1
-  fi
-  if [ ! -f "$PYTHONLIBFILE" ]; then
-    echo "*** ERROR: wrong -pylib path: $PYTHONLIBFILE does not exist or not a file"
-    exit 1
-  fi
-else
-  HAVE_PYTHON=0
-fi
-
-if [ "$BUILD" = "" ]; then
-  BUILD=$CURR_DIR/build-$CONFIG
-fi
-
-if [ "$BIN" = "" ]; then
-  BIN=$CURR_DIR/bin-$CONFIG
-fi
-
-if [ "$QMAKE_CCACHE" = 1 ]; then
-  echo "    Compilation caching is activated."
-else
-  echo "    Compilation caching is deactivated!"
-fi
-echo "    Installation target: $BIN"
-echo "    Build directory: $BUILD"
-
-mkdir -p $BUILD
-
-# source the version script
-. $(dirname $(which $0))/version.sh
-
-# qmake needs absolute paths, so we get them now:
-#   OSX does not have `readlink -f` command. Use equivalent Perl script.
-if [ "$IS_MAC" = "no" ]; then
-  BUILD=`readlink -f $BUILD`
-  BIN=`readlink -f $BIN`
-else
-  BUILD=`perl -MCwd -le 'print Cwd::abs_path(shift)' $BUILD`
-  BIN=`perl -MCwd -le 'print Cwd::abs_path(shift)' $BIN`
-fi
-
-if [ "$IS_MAC" = "no" ]; then
-  if ( gmake -v >/dev/null 2>/dev/null ); then
-    MAKE_PRG=gmake
-  else
-    MAKE_PRG=make
-  fi
-else
-  MAKE_PRG=make
-fi
-
-PLUGINS=""
-cd $CURR_DIR/src/plugins
-for plugin in `echo *`; do
-  if [ -e $plugin/$plugin.pro ]; then
-    PLUGINS="$PLUGINS$plugin "
-  fi
-done
-cd $CURR_DIR
-
-echo "    Building plugins: $PLUGINS"
-echo ""
-
-echo "Running $QMAKE .."
-cd $BUILD
-
-# chose the right qmake
-if [ $HAVE_QT5 = 0 ]; then
-  export QT_SELECT=4
-else
-  export QT_SELECT=5
-fi
-
-$QMAKE -v
-
-# Force a minimum rebuild because of version info
-touch $CURR_DIR/src/version/version.h
-
-qmake_options=(
-  -recursive
-  CONFIG+="$CONFIG"
-  RUBYLIBFILE="$RUBYLIBFILE"
-  RUBYVERSIONCODE="$RUBYVERSIONCODE"
-  HAVE_RUBY="$HAVE_RUBY"
-  PYTHON="$PYTHON"
-  PYTHONLIBFILE="$PYTHONLIBFILE"
-  PYTHONINCLUDE="$PYTHONINCLUDE"
-  PYTHONEXTSUFFIX="$PYTHONEXTSUFFIX"
-  HAVE_PYTHON="$HAVE_PYTHON"
-  HAVE_QTBINDINGS="$HAVE_QTBINDINGS"
-  HAVE_QT_UITOOLS="$HAVE_QT_UITOOLS"
-  HAVE_QT_NETWORK="$HAVE_QT_NETWORK"
-  HAVE_QT_SQL="$HAVE_QT_SQL"
-  HAVE_QT_SVG="$HAVE_QT_SVG"
-  HAVE_QT_PRINTSUPPORT="$HAVE_QT_PRINTSUPPORT"
-  HAVE_QT_MULTIMEDIA="$HAVE_QT_MULTIMEDIA"
-  HAVE_QT_DESIGNER="$HAVE_QT_DESIGNER"
-  HAVE_QT_XML="$HAVE_QT_XML"
-  HAVE_64BIT_COORD="$HAVE_64BIT_COORD"
-  HAVE_QT="$HAVE_QT"
-  HAVE_QT5="$HAVE_QT5"
-  HAVE_CURL="$HAVE_CURL"
-  HAVE_EXPAT="$HAVE_EXPAT"
-  PREFIX="$BIN"
-  RPATH="$RPATH"
-  KLAYOUT_VERSION="$KLAYOUT_VERSION"
-  KLAYOUT_VERSION_DATE="$KLAYOUT_VERSION_DATE"
-  KLAYOUT_VERSION_REV="$KLAYOUT_VERSION_REV"
-)
-
-# NOTE: qmake does not like include paths which clash with paths built into the compiler
-# hence we don't add RUBYINCLUDE or RUBYINCLUDE2 in this case (found on CentOS 8 where Ruby
-# headers are installed in /usr/include)
-if [ "$RUBYINCLUDE" != "/usr/include" ] && [  "$RUBYINCLUDE" != "/usr/local/include" ]; then
-  qmake_options+=( RUBYINCLUDE="$RUBYINCLUDE" )
-fi
-if [ "$RUBYINCLUDE2" != "/usr/include" ] && [  "$RUBYINCLUDE2" != "/usr/local/include" ]; then
-  qmake_options+=( RUBYINCLUDE2="$RUBYINCLUDE2" )
-fi
-
-# This should speed up build time considerably
-# https://ortogonal.github.io/ccache-and-qmake-qtcreator/
-if [ "$QMAKE_CCACHE" = 1 ]; then
-  qmake_options+=(
-    CONFIG+="ccache"
-  )
-fi
-
-if [ $BUILD_EXPERT = 1 ]; then
-  qmake_options+=(
-    QMAKE_AR="$AR cqs"
-    QMAKE_LINK_C="$CC"
-    QMAKE_LINK_C_SHLIB="$CC"
-    QMAKE_LINK="$CXX"
-    QMAKE_LINK_SHLIB="$CXX"
-    QMAKE_OBJCOPY="$OBJCOPY"
-    QMAKE_RANLIB=
-    QMAKE_STRIP=
-    QMAKE_CC="$CC"
-    QMAKE_CXX="$CXX"
-    QMAKE_CFLAGS="$CFLAGS"
-    QMAKE_CFLAGS_RELEASE=
-    QMAKE_CFLAGS_DEBUG=
-    QMAKE_CXXFLAGS="$CXXFLAGS"
-    QMAKE_CXXFLAGS_RELEASE=
-    QMAKE_CXXFLAGS_DEBUG=
-    QMAKE_LFLAGS="$LDFLAGS"
-    QMAKE_LFLAGS_RELEASE=
-    QMAKE_LFLAGS_DEBUG=
-  )
-fi
-
-echo $QMAKE "$CURR_DIR/src/klayout.pro" "${qmake_options[@]}"
-$QMAKE "$CURR_DIR/src/klayout.pro" "${qmake_options[@]}"
-
-cd $CURR_DIR
-echo ""
-
-if [ $RUN_MAKE = 0 ]; then
-  exit 0
-fi
-
-# -- Running build  --
-
-echo "Running build ($MAKE_PRG $MAKE_OPT all) .."
-cd $BUILD
-$MAKE_PRG $MAKE_OPT || exit 1
-cd $CURR_DIR
-echo ""
-
-# -- Installing binaries  --
-
-echo "Installing binaries .."
-cd $BUILD
-$MAKE_PRG install
-cd $CURR_DIR
-echo ""
-echo "Build successfully done."
-echo "Artefacts were installed to $BIN"
-
-exit 0
-
+#!/bin/bash
+
+#
+# KLayout Layout Viewer
+# Copyright (C) 2006-2021 Matthias Koefferlein
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+CURR_DIR=`pwd`
+RUN_MAKE=1
+IS_MAC="no"
+IS_WINDOWS="no"
+IS_LINUX="no"
+
+HAVE_QTBINDINGS=1
+HAVE_QT_UITOOLS=1
+HAVE_QT_NETWORK=1
+HAVE_QT_SQL=1
+HAVE_QT_SVG=1
+HAVE_QT_PRINTSUPPORT=1
+HAVE_QT_MULTIMEDIA=1
+HAVE_QT_DESIGNER=1
+HAVE_QT_XML=1
+HAVE_64BIT_COORD=0
+HAVE_QT=1
+HAVE_QT5="" # not set
+HAVE_CURL=0
+HAVE_EXPAT=0
+
+RUBYINCLUDE=""
+RUBYINCLUDE2=""
+RUBYLIBFILE=""
+RUBYVERSIONCODE=""
+
+PYTHONINCLUDE=""
+PYTHONLIBFILE=""
+PYTHONEXTSUFFIX=""
+
+QMAKE=""
+RUBY=""
+PYTHON=""
+BUILD=""
+BIN=""
+RPATH=""
+
+MAKE_OPT=""
+
+CONFIG="release"
+BUILD_EXPERT=0
+
+# Check if building on Mac OSX Darwin family
+case `uname` in
+    Linux*)
+        IS_LINUX="yes"
+        ;;
+    MINGW*)
+        IS_WINDOWS="yes"
+        ;;
+    CYGWIN*)
+        IS_WINDOWS="yes"
+        ;;
+    Darwin*)
+        IS_MAC="yes"
+        ;;
+    *)
+        ;;
+esac
+
+# Check, whether build.sh is run from the top level folder
+if ! [ -e src ] || ! [ -e src/klayout.pro ]; then
+  echo "*** ERROR: run build.sh from the top level folder"
+  exit 1
+fi
+
+while [ "$*" != "" ]; do
+
+  a=$1
+  shift
+
+  case $a in
+  -without-qt)
+    HAVE_QT=0
+    ;;
+  -with-qtbinding)
+    HAVE_QTBINDINGS=1
+    ;;
+  -without-qtbinding)
+    HAVE_QTBINDINGS=0
+    ;;
+  -without-qt-uitools)
+    HAVE_QT_UITOOLS=0
+    ;;
+  -without-qt-network)
+    HAVE_QT_NETWORK=0
+    ;;
+  -without-qt-sql)
+    HAVE_QT_SQL=0
+    ;;
+  -without-qt-svg)
+    HAVE_QT_SVG=0
+    ;;
+  -without-qt-printsupport)
+    HAVE_QT_PRINTSUPPORT=0
+    ;;
+  -without-qt-multimedia)
+    HAVE_QT_MULTIMEDIA=0
+    ;;
+  -without-qt-designer)
+    HAVE_QT_DESIGNER=0
+    ;;
+  -without-qt-xml)
+    HAVE_QT_XML=0
+    ;;
+  -with-64bit-coord)
+    HAVE_64BIT_COORD=1
+    ;;
+  -without-64bit-coord)
+    HAVE_64BIT_COORD=0
+    ;;
+  -release)
+    CONFIG="release"
+    ;;
+  -debug)
+    CONFIG="debug"
+    ;;
+  -expert)
+    BUILD_EXPERT=1
+    ;;
+  -python)
+    PYTHON="$1"
+    shift
+    ;;
+  -nopython)
+    PYTHON="-"
+    ;;
+  -pyinc)
+    PYTHONINCLUDE="$1"
+    shift
+    ;;
+  -pylib)
+    PYTHONLIBFILE="$1"
+    shift
+    ;;
+  -pyextsuffix)
+    PYTHONEXTSUFFIX="$1"
+    shift
+    ;;
+  -qmake)
+    QMAKE="$1"
+    shift
+    ;;
+  -ruby)
+    RUBY="$1"
+    shift
+    ;;
+  -noruby)
+    RUBY="-"
+    ;;
+  -rbvers)
+    RUBYVERSIONCODE="$1"
+    shift
+    ;;
+  -rbinc)
+    RUBYINCLUDE="$1"
+    shift
+    ;;
+  -rbinc2)
+    RUBYINCLUDE2="$1"
+    shift
+    ;;
+  -rblib)
+    RUBYLIBFILE="$1"
+    shift
+    ;;
+  -build)
+    BUILD="$1"
+    shift
+    ;;
+  -bin|-prefix)
+    BIN="$1"
+    shift
+    ;;
+  -rpath)
+    RPATH="$1"
+    shift
+    ;;
+  -qt4)
+    HAVE_QT5=0
+    ;;
+  -qt5)
+    HAVE_QT5=1
+    ;;
+  -dry-run)
+    RUN_MAKE=0
+    ;;
+  -libcurl)
+    HAVE_CURL=1
+    ;;
+  -libexpat)
+    HAVE_EXPAT=1
+    ;;
+  -option)
+    MAKE_OPT="$MAKE_OPT $1"
+    shift
+    ;;
+  -h|--help|-help)
+    echo "usage: build [options]"
+    echo ""
+    echo "options:"
+    echo ""
+    echo "  -debug                Run a debug build"
+    echo "  -release              Run a release build [default]"
+    echo ""
+    echo "  -qmake <prog>         Use qmake 'prog'"
+    echo ""
+    echo "  -noruby               Don't build with Ruby support"
+    echo "  -ruby <prog>          Use Ruby interpreter 'prog'"
+    echo ""
+    echo "  -nopython             Don't build with Python support"
+    echo "  -python <prog>        Use Python interpreter 'prog'"
+    echo ""
+    echo "  -build <path>         Directory where to do the build"
+    echo "  -bin|-prefix <path>   Directory where to install the binary"
+    echo "  -rpath <rpath>        Specifies the RPATH to use (default: same as -bin)"
+    echo "  -option <option>      'make' options (i.e. -j2)"
+    echo ""
+    echo "  -with-qtbinding       Create Qt bindings for ruby scripts [default]"
+    echo "  -without-qtbinding    Don't create Qt bindings for ruby scripts"
+    echo "  -without-qt-uitools   Don't include uitools in Qt binding"
+    echo "  -with-64bit-coord     Use long (64bit) coordinates - EXPERIMENTAL FEATURE"
+    echo "                          (only available for gcc>=4.4 for 64bit build)"
+    echo "  -without-64bit-coord  Don't use long (64bit) coordinates [default]"
+    echo "  -without-qt           Qt-less build of the core libraries (including pymod)"
+    echo "                          (implies -without-qtbinding)"
+    echo ""
+    echo "  -dry-run              Don't build, just run qmake"
+    echo ""
+    echo "Special options (usually auto-selected from ruby/python/Qt installation):"
+    echo ""
+    echo "  -qt4|-qt5             Use Qt4 or Qt5 API [default: auto detect]"
+    echo ""
+    echo "  -rblib <file>         Location of the .so/.dll to link for Ruby support"
+    echo "  -rbinc <dir>          Location of the Ruby headers (in particular 'ruby.h')"
+    echo "                          -rbinc and -rblib must be set to enable Ruby support"
+    echo "  -rbinc2 <dir>         Second include path for Ruby 1.9 (containing 'ruby/config.h')"
+    echo "  -rbvers <xyyzz>       Ruby version code"
+    echo ""
+    echo "  -pylib <file>         Location of the .so/.dll to link for Python support"
+    echo "  -pyinc <dir>          Location of the Python headers (in particular 'Python.h')"
+    echo ""
+    echo "  -libcurl              Use libcurl instead of QtNetwork (for Qt<4.7)"
+    echo "  -libexpat             Use libexpat instead of QtXml"
+    echo ""
+    echo "Environment Variables:"
+    echo ""
+    echo "  QMAKE_CCACHE=1        Adds CONFIG+=ccache to qmake command (only works if Qt>=5.9.2)"
+    echo ""
+    exit 0
+    ;;
+  *)
+    MAKE_OPT="$MAKE_OPT $a"
+    ;;
+  esac
+
+done
+
+echo "Scanning installation .."
+echo ""
+
+# Import version info
+. ./version.sh
+
+echo "Version Info:"
+echo "    Version: $KLAYOUT_VERSION"
+echo "    Date: $KLAYOUT_VERSION_DATE"
+echo "    Revision: $KLAYOUT_VERSION_REV"
+echo ""
+
+# if not given, try to detect the qmake binary
+if [ "$QMAKE" = "" ]; then
+  for qmake in "qmake5" "qmake-qt5" "qmake4" "qmake-qt4" "qmake"; do
+    if [ "$QMAKE" = "" ] && [ "`$qmake -v 2>/dev/null`" != "" ]; then
+      QMAKE="$qmake"
+    fi
+  done
+fi
+if [ "$QMAKE" = "" ]; then
+  echo "*** ERROR: unable to find qmake tool in path"
+  exit 1
+fi
+
+# if not given, try to detect the qt major version to use
+if [ "$HAVE_QT5" = "" ]; then
+  qt_major=`$QMAKE -v | grep 'Using Qt version' | sed 's/.*version  *\([0-9][0-9]*\).*/\1/'`
+  if [ "$qt_major" = "4" ]; then
+    HAVE_QT5=0
+  elif [ "$qt_major" = "5" ]; then
+    HAVE_QT5=1
+  else
+    echo "*** ERROR: could not determine Qt version from '$QMAKE -v'"
+    exit 1
+  fi
+fi
+
+echo "Using qmake: $QMAKE"
+echo ""
+
+# if not given, locate ruby interpreter (prefer 1.9, then default, finally 1.8 as fallback)
+if [ "$RUBY" = "" ]; then
+  for ruby in "ruby2.4" "ruby2.3" "ruby2.2" "ruby2.1" "ruby2" "ruby1.9" "ruby" "ruby1.8"; do
+    if [ "$RUBY" = "" ] && [ "`$ruby -e 'puts 1' 2>/dev/null`" = "1" ]; then
+      RUBY="$ruby"
+    fi
+  done
+fi
+if [ "$RUBY" != "" ] && [ "$RUBY" != "-" ]; then
+
+  echo "Using Ruby interpreter: $RUBY"
+
+  if [ "`$RUBY -e 'puts 1' 2>/dev/null`" != "1" ]; then
+    echo "*** ERROR: unable to run Ruby interpreter $RUBY"
+    exit 1
+  fi
+
+  # Get ruby version
+  if [ "$RUBYVERSIONCODE" = "" ]; then
+    RUBYVERSIONCODE=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['MAJOR'] || 0).to_i*10000+(RbConfig::CONFIG['MINOR'] || 0).to_i*100+(RbConfig::CONFIG['TEENY'] || 0).to_i"`
+  fi
+
+  # Get ruby installation files
+  if [ "$RUBYLIBFILE" = "" ]; then
+    RUBYLIBFILENAME=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['LIBRUBY'] || '')"`
+    RUBYLIBFILENAME_SO=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['LIBRUBY_SO'] || '')"`
+    RUBYLIBFILENAME_A=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['LIBRUBY_A'] || '')"`
+    if [ "$RUBYLIBFILENAME_A" = "" ] && [ "$RUBYLIBFILENAME_SO" = "" ] && [ "RUBYLIBFILENAME" = "" ]; then
+      echo "*** WARNING: Could not get Ruby library name"
+    else
+      RUBYLIBFILEPATH=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['archlibdir'] || '')"`
+      if [ "$RUBYLIBFILEPATH" = "" ] || ! [ -e "$RUBYLIBFILEPATH" ]; then
+        RUBYLIBFILEPATH=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['libdir'] || '')"`
+      fi
+      if [ "$RUBYLIBFILEPATH" = "" ]; then
+        echo "*** WARNING: Could not get Ruby library path"
+      elif [ -f "$RUBYLIBFILEPATH/$RUBYLIBFILENAME" ]; then
+        RUBYLIBFILE="$RUBYLIBFILEPATH/$RUBYLIBFILENAME"
+        echo "    Ruby library found: $RUBYLIBFILE"
+      elif [ -f "$RUBYLIBFILEPATH/$RUBYLIBFILENAME_SO" ]; then
+        RUBYLIBFILE="$RUBYLIBFILEPATH/$RUBYLIBFILENAME_SO"
+        echo "    Ruby library found: $RUBYLIBFILE"
+      elif [ -f "$RUBYLIBFILEPATH/$RUBYLIBFILENAME_A" ]; then
+        RUBYLIBFILE="$RUBYLIBFILEPATH/$RUBYLIBFILENAME_A"
+        echo "    Ruby library found: $RUBYLIBFILE"
+      else
+        echo "*** WARNING: Could not locate Ruby library"
+        echo "    Candidates are:"
+        echo "      $RUBYLIBFILEPATH/$RUBYLIBFILENAME"
+        echo "      $RUBYLIBFILEPATH/$RUBYLIBFILENAME_SO"
+        echo "      $RUBYLIBFILEPATH/$RUBYLIBFILENAME_A"
+        echo "    (none of them could be found)"
+      fi
+    fi
+  fi
+
+  if [ "$RUBYLIBFILE" != "" ]; then
+    RUBYHDRDIR=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['rubyhdrdir'] || '')"`
+    if [ "$RUBYHDRDIR" = "" ]; then
+      if [ "$RUBYINCLUDE" = "" ]; then
+        RUBYINCLUDE=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['archdir'] || '')"`
+      fi
+      echo "    Ruby headers found: $RUBYINCLUDE"
+    else
+      if [ "$RUBYINCLUDE" = "" ]; then
+        RUBYINCLUDE="$RUBYHDRDIR"
+      fi
+      if [ "$RUBYINCLUDE2" = "" ]; then
+        RUBYINCLUDE2=`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['rubyarchhdrdir'] || '')"`
+      fi
+      if [ "$RUBYINCLUDE2" = "" ]; then
+        RUBYINCLUDE2="$RUBYHDRDIR"/`$RUBY -rrbconfig -e "puts (RbConfig::CONFIG['arch'] || '')"`
+      fi
+      echo "    Ruby headers found: $RUBYINCLUDE and $RUBYINCLUDE2"
+    fi
+  fi
+
+  echo "    Ruby installation is in:"
+  echo "    - $RUBYLIBFILE (lib)"
+  echo "    - $RUBYINCLUDE (headers)"
+  echo "    - $RUBYINCLUDE2 (arch headers)"
+  echo "    Ruby version code is $RUBYVERSIONCODE"
+  echo ""
+
+fi
+
+# if not given, locate Python interpreter
+if [ "$PYTHON" = "" ]; then
+  for python in "python3.5" "python3.4" "python3.3" "python3.2" "python3.1" "python3" "python2.8" "python2.7" "python2" "python"; do
+    if [ "$PYTHON" = "" ] && [ "`$python -c 'print(1)' 2>/dev/null`" = "1" ]; then
+      PYTHON="$python"
+    fi
+  done
+fi
+if [ "$PYTHON" != "" ] && [ "$PYTHON" != "-" ]; then
+
+  echo "Using Python interpreter: $PYTHON"
+
+  if [ "`$PYTHON -c 'print(1)' 2>/dev/null`" != "1" ]; then
+    echo "*** ERROR: unable to run Python interpreter $PYTHON"
+    exit 1
+  fi
+
+  # Get Python installation files
+  if [ "$PYTHONLIBFILE" = "" ]; then
+    PYTHONLIBFILENAME=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('LDLIBRARY')[0])" 2>/dev/null`
+    if [ "$PYTHONLIBFILENAME" = "" ]; then
+      PYTHONLIBFILENAME=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('LIBRARY')[0])" 2>/dev/null`
+    fi
+    if [ "$PYTHONLIBFILENAME" = "" ]; then
+      PYTHONLIBFILENAME=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('LDLIBRARY')[0])" 2>/dev/null`
+    fi
+    if [ "$PYTHONLIBFILENAME" = "" ]; then
+      PYTHONLIBFILENAME=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('LIBRARY')[0])" 2>/dev/null`
+    fi
+    if [ "$PYTHONLIBFILENAME" = "" ]; then
+      echo "*** WARNING: Could not get Python library name"
+    else
+      PYTHONLIBFILEPATH=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('LIBDIR')[0])" 2>/dev/null`
+      if [ "$PYTHONLIBFILEPATH" = "" ]; then
+        PYTHONLIBFILEPATH=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('LIBDIR')[0])" 2>/dev/null`
+      fi
+      if [ "$PYTHONLIBFILEPATH" = "" ]; then
+        echo "*** WARNING: Could not get Python library path"
+      else
+        PYTHONLIBFILE="$PYTHONLIBFILEPATH/$PYTHONLIBFILENAME"
+        if [ ! -f "$PYTHONLIBFILE" ]; then
+          echo "    INFO: Python library not in default path, trying to use MULTIARCH"
+          PYTHONMULTIARCH=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('MULTIARCH')[0])" 2>/dev/null`
+          PYTHONLIBFILE="$PYTHONLIBFILEPATH/$PYTHONMULTIARCH/$PYTHONLIBFILENAME"
+        fi
+        echo "    Python library found: $PYTHONLIBFILE"
+      fi
+    fi
+  fi
+
+  if [ "$PYTHONINCLUDE" = "" ]; then
+    PYTHONINCLUDE=`$PYTHON -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars('INCLUDEPY')[0])" 2>/dev/null`
+    if [ "$PYTHONINCLUDE" = "" ]; then
+      PYTHONINCLUDE=`$PYTHON -c "import sysconfig; print(sysconfig.get_config_vars('INCLUDEPY')[0])" 2>/dev/null`
+    fi
+    echo "    Python headers found: $PYTHONINCLUDE"
+  fi
+
+  if [ "$PYTHONEXTSUFFIX" = "" ]; then
+    PYTHONEXTSUFFIX=$($PYTHON -c "import sysconfig; print(sysconfig.get_config_var('EXT_SUFFIX') or sysconfig.get_config_var('SO'))" 2>/dev/null)
+    if [ "$PYTHONEXTSUFFIX" = "" ]; then
+      if [ "$IS_WINDOWS" = "yes" ]; then
+        PYTHONEXTSUFFIX=.dll
+      elif [ "$IS_MAC" = "yes" ]; then
+        PYTHONEXTSUFFIX=.dylib
+      else
+        PYTHONEXTSUFFIX=.so
+      fi
+    fi
+    echo "    Python extension suffix: $PYTHONEXTSUFFIX"
+  fi
+
+  echo "    Python installation is in:"
+  echo "    - $PYTHONLIBFILE (lib)"
+  echo "    - $PYTHONINCLUDE (includes)"
+  echo ""
+
+fi
+
+if [ $HAVE_QT = 0 ]; then
+  HAVE_QTBINDINGS=0
+fi
+
+echo "Features:"
+if [ $HAVE_QT = 0 ]; then
+  echo "    Qt not used at all"
+fi
+if [ $HAVE_QTBINDINGS != 0 ]; then
+  if [ "$HAVE_QT5" != "0" ]; then
+    echo "    Qt bindings enabled (Qt 5 API)"
+  else
+    echo "    Qt bindings enabled (Qt 4 API)"
+  fi
+fi
+if [ $HAVE_64BIT_COORD != 0 ]; then
+  echo "    64 bit coordinates enabled"
+fi
+if [ $HAVE_EXPAT != 0 ]; then
+  echo "    Uses libexpat for XML parsing"
+fi
+if [ $HAVE_CURL != 0 ]; then
+  echo "    Uses libcurl for network access"
+fi
+if [ "$RPATH" = "" ]; then
+  RPATH="$BIN"
+fi
+
+# Check Ruby installation
+if [ "$RUBYINCLUDE" != "" ]; then
+  HAVE_RUBY=1
+  if [ "$RUBYLIBFILE" = "" ]; then
+    echo "*** ERROR: -rblib not specified or library path cannot be determined from Ruby installation"
+    exit 1
+  fi
+  if [ "$RUBYVERSIONCODE" = "" ]; then
+    echo "*** ERROR: -rbvers not specified or version cannot be determined from Ruby installation"
+    exit 1
+  fi
+  if [ ! -f "$RUBYINCLUDE/ruby.h" ]; then
+    echo "*** ERROR: wrong -rbinc path: $RUBYINCLUDE/ruby.h does not exist or is not a file"
+    exit 1
+  fi
+  if [ "$RUBYINCLUDE2" != "" ] && [ ! -f "$RUBYINCLUDE2/ruby/config.h" ]; then
+    echo "*** ERROR: wrong -rbinc2 path: $RUBYINCLUDE2/ruby/config.h does not exist or is not a file"
+    exit 1
+  fi
+  if [ ! -f "$RUBYLIBFILE" ]; then
+    echo "*** ERROR: wrong -rblib path: $RUBYLIBFILE does not exist or not a file"
+    exit 1
+  fi
+else
+  HAVE_RUBY=0
+fi
+
+# Check Python installation
+if [ "$PYTHONINCLUDE" != "" ]; then
+  HAVE_PYTHON=1
+  if [ "$PYTHONLIBFILE" = "" ]; then
+    echo "*** ERROR: -pylib not specified or library path cannot be determined from Python installation"
+    exit 1
+  fi
+  if [ ! -f "$PYTHONINCLUDE/Python.h" ]; then
+    echo "*** ERROR: wrong -pyinc path: $PYTHONINCLUDE/Python does not exist or is not a file"
+    exit 1
+  fi
+  if [ ! -f "$PYTHONLIBFILE" ]; then
+    echo "*** ERROR: wrong -pylib path: $PYTHONLIBFILE does not exist or not a file"
+    exit 1
+  fi
+else
+  HAVE_PYTHON=0
+fi
+
+if [ "$BUILD" = "" ]; then
+  BUILD=$CURR_DIR/build-$CONFIG
+fi
+
+if [ "$BIN" = "" ]; then
+  BIN=$CURR_DIR/bin-$CONFIG
+fi
+
+if [ "$QMAKE_CCACHE" = 1 ]; then
+  echo "    Compilation caching is activated."
+else
+  echo "    Compilation caching is deactivated!"
+fi
+echo "    Installation target: $BIN"
+echo "    Build directory: $BUILD"
+
+mkdir -p $BUILD
+
+# source the version script
+. $(dirname $(which $0))/version.sh
+
+# qmake needs absolute paths, so we get them now:
+#   OSX does not have `readlink -f` command. Use equivalent Perl script.
+if [ "$IS_MAC" = "no" ]; then
+  BUILD=`readlink -f $BUILD`
+  BIN=`readlink -f $BIN`
+else
+  BUILD=`perl -MCwd -le 'print Cwd::abs_path(shift)' $BUILD`
+  BIN=`perl -MCwd -le 'print Cwd::abs_path(shift)' $BIN`
+fi
+
+if [ "$IS_MAC" = "no" ]; then
+  if ( gmake -v >/dev/null 2>/dev/null ); then
+    MAKE_PRG=gmake
+  else
+    MAKE_PRG=make
+  fi
+else
+  MAKE_PRG=make
+fi
+
+PLUGINS=""
+cd $CURR_DIR/src/plugins
+for plugin in `echo *`; do
+  if [ -e $plugin/$plugin.pro ]; then
+    PLUGINS="$PLUGINS$plugin "
+  fi
+done
+cd $CURR_DIR
+
+echo "    Building plugins: $PLUGINS"
+echo ""
+
+echo "Running $QMAKE .."
+cd $BUILD
+
+# chose the right qmake
+if [ $HAVE_QT5 = 0 ]; then
+  export QT_SELECT=4
+else
+  export QT_SELECT=5
+fi
+
+$QMAKE -v
+
+# Force a minimum rebuild because of version info
+touch $CURR_DIR/src/version/version.h
+
+qmake_options=(
+  -recursive
+  CONFIG+="$CONFIG"
+  RUBYLIBFILE="$RUBYLIBFILE"
+  RUBYVERSIONCODE="$RUBYVERSIONCODE"
+  HAVE_RUBY="$HAVE_RUBY"
+  PYTHON="$PYTHON"
+  PYTHONLIBFILE="$PYTHONLIBFILE"
+  PYTHONINCLUDE="$PYTHONINCLUDE"
+  PYTHONEXTSUFFIX="$PYTHONEXTSUFFIX"
+  HAVE_PYTHON="$HAVE_PYTHON"
+  HAVE_QTBINDINGS="$HAVE_QTBINDINGS"
+  HAVE_QT_UITOOLS="$HAVE_QT_UITOOLS"
+  HAVE_QT_NETWORK="$HAVE_QT_NETWORK"
+  HAVE_QT_SQL="$HAVE_QT_SQL"
+  HAVE_QT_SVG="$HAVE_QT_SVG"
+  HAVE_QT_PRINTSUPPORT="$HAVE_QT_PRINTSUPPORT"
+  HAVE_QT_MULTIMEDIA="$HAVE_QT_MULTIMEDIA"
+  HAVE_QT_DESIGNER="$HAVE_QT_DESIGNER"
+  HAVE_QT_XML="$HAVE_QT_XML"
+  HAVE_64BIT_COORD="$HAVE_64BIT_COORD"
+  HAVE_QT="$HAVE_QT"
+  HAVE_QT5="$HAVE_QT5"
+  HAVE_CURL="$HAVE_CURL"
+  HAVE_EXPAT="$HAVE_EXPAT"
+  PREFIX="$BIN"
+  RPATH="$RPATH"
+  KLAYOUT_VERSION="$KLAYOUT_VERSION"
+  KLAYOUT_VERSION_DATE="$KLAYOUT_VERSION_DATE"
+  KLAYOUT_VERSION_REV="$KLAYOUT_VERSION_REV"
+)
+
+# NOTE: qmake does not like include paths which clash with paths built into the compiler
+# hence we don't add RUBYINCLUDE or RUBYINCLUDE2 in this case (found on CentOS 8 where Ruby
+# headers are installed in /usr/include)
+if [ "$RUBYINCLUDE" != "/usr/include" ] && [  "$RUBYINCLUDE" != "/usr/local/include" ]; then
+  qmake_options+=( RUBYINCLUDE="$RUBYINCLUDE" )
+fi
+if [ "$RUBYINCLUDE2" != "/usr/include" ] && [  "$RUBYINCLUDE2" != "/usr/local/include" ]; then
+  qmake_options+=( RUBYINCLUDE2="$RUBYINCLUDE2" )
+fi
+
+# This should speed up build time considerably
+# https://ortogonal.github.io/ccache-and-qmake-qtcreator/
+if [ "$QMAKE_CCACHE" = 1 ]; then
+  qmake_options+=(
+    CONFIG+="ccache"
+  )
+fi
+
+if [ $BUILD_EXPERT = 1 ]; then
+  qmake_options+=(
+    QMAKE_AR="$AR cqs"
+    QMAKE_LINK_C="$CC"
+    QMAKE_LINK_C_SHLIB="$CC"
+    QMAKE_LINK="$CXX"
+    QMAKE_LINK_SHLIB="$CXX"
+    QMAKE_OBJCOPY="$OBJCOPY"
+    QMAKE_RANLIB=
+    QMAKE_STRIP=
+    QMAKE_CC="$CC"
+    QMAKE_CXX="$CXX"
+    QMAKE_CFLAGS="$CFLAGS"
+    QMAKE_CFLAGS_RELEASE=
+    QMAKE_CFLAGS_DEBUG=
+    QMAKE_CXXFLAGS="$CXXFLAGS"
+    QMAKE_CXXFLAGS_RELEASE=
+    QMAKE_CXXFLAGS_DEBUG=
+    QMAKE_LFLAGS="$LDFLAGS"
+    QMAKE_LFLAGS_RELEASE=
+    QMAKE_LFLAGS_DEBUG=
+  )
+fi
+
+echo $QMAKE "$CURR_DIR/src/klayout.pro" "${qmake_options[@]}"
+$QMAKE "$CURR_DIR/src/klayout.pro" "${qmake_options[@]}"
+
+cd $CURR_DIR
+echo ""
+
+if [ $RUN_MAKE = 0 ]; then
+  exit 0
+fi
+
+# -- Running build  --
+
+echo "Running build ($MAKE_PRG $MAKE_OPT all) .."
+cd $BUILD
+$MAKE_PRG $MAKE_OPT || exit 1
+cd $CURR_DIR
+echo ""
+
+# -- Installing binaries  --
+
+echo "Installing binaries .."
+cd $BUILD
+$MAKE_PRG install
+cd $CURR_DIR
+echo ""
+echo "Build successfully done."
+echo "Artefacts were installed to $BIN"
+
+exit 0
+