dnl Process this file with autoconf to produce a configure script.
dnl Use autoconf 2.52 or newer.

AC_INIT(netgen, 1.3, eda-dev@opencircuitdesign.com)
AC_PREREQ(2.52)
AC_CONFIG_SRCDIR(rules.mak)
AC_CONFIG_AUX_DIR(.)

AC_CANONICAL_SYSTEM

dnl pass the version string on the the makefiles
PACKAGE=netgen
NETGEN_VERSION=`cat ../VERSION | cut -d. -f1-2`
NETGEN_REVISION=`cat ../VERSION | cut -d. -f3`
AC_DEFINE_UNQUOTED(NETGEN_VERSION, "${NETGEN_VERSION}")
AC_DEFINE_UNQUOTED(NETGEN_REVISION, "${NETGEN_REVISION}")

dnl Override default target when compiling under TCL
ALL_TARGET="standard"
INSTALL_TARGET="install-netgen"

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CPP
AC_ISC_POSIX
AC_PROG_INSTALL
AC_PROG_RANLIB

dnl GNU M4 is preferred due to some of the option switches.
AC_PATH_PROGS([M4], [gm4 gnum4 m4], [no])
if test x$M4 = xno; then
  AC_MSG_ERROR([M4 is required])
fi

dnl check size of pointer for correct behavior on 64-bit systems
dnl If the C preprocessor is GCC, we need to force the flag to
dnl assert that input files are of type C, or else the preprocessing
dnl stage will not execute correctly on the ".in" files in the scmos
dnl directory.

if test "$CPP" = "$CC -E" ; then
   CPP="$CPP -x c"
fi

dnl check if the linker is a GNU linker

#------------------------------------------------------------
# AC_PROG_LD - find the path to the GNU or non-GNU linker
# (This stuff ripped from libtool)
#------------------------------------------------------------
AC_DEFUN([AC_PROG_LD],
[AC_ARG_WITH(gnu-ld,
[  --with-gnu-ld           assume the C compiler uses GNU ld [[default=no]]],
test "$withval" = no || with_gnu_ld=yes, with_gnu_ld=no)
AC_REQUIRE([AC_PROG_CC])dnl
AC_REQUIRE([AC_CANONICAL_HOST])dnl
dnl ###not for PostgreSQL### AC_REQUIRE([AC_CANONICAL_BUILD])dnl
ac_prog=ld
if test "$GCC" = yes; then
  # Check if gcc -print-prog-name=ld gives a path.
  AC_MSG_CHECKING([for ld used by GCC])
  case $host in
  *-*-mingw*)
    # gcc leaves a trailing carriage return which upsets mingw
    ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
  *)
    ac_prog=`($CC -print-prog-name=ld) 2>&5` ;;
  esac
  case "$ac_prog" in
    # Accept absolute paths.
changequote(,)dnl
    [\\/]* | [A-Za-z]:[\\/]*)
      re_direlt='/[^/][^/]*/\.\./'
changequote([,])dnl
      # Canonicalize the path of ld
      ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
      while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
        ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
      done
      test -z "$LD" && LD="$ac_prog"
      ;;
  "")
    # If it fails, then pretend we aren't using GCC.
    ac_prog=ld
    ;;
  *)
    # If it is relative, then search for the first ld in PATH.
    with_gnu_ld=unknown
    ;;
  esac
elif test "$with_gnu_ld" = yes; then
  AC_MSG_CHECKING([for GNU ld])
else
  AC_MSG_CHECKING([for non-GNU ld])
fi
AC_CACHE_VAL(ac_cv_path_LD,
[if test -z "$LD"; then
  IFS="${IFS=   }"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
  for ac_dir in $PATH; do
    test -z "$ac_dir" && ac_dir=.
    if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
      ac_cv_path_LD="$ac_dir/$ac_prog"
      # Check to see if the program is GNU ld.  I'd rather use --version,
      # but apparently some GNU ld's only accept -v.
      # Break only if it was the GNU/non-GNU ld that we prefer.
      if "$ac_cv_path_LD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
        test "$with_gnu_ld" != no && break
      else
        test "$with_gnu_ld" != yes && break
      fi
    fi
  done
  IFS="$ac_save_ifs"
else
  ac_cv_path_LD="$LD" # Let the user override the test with a path.
fi])
LD="$ac_cv_path_LD"
if test -n "$LD"; then
  AC_MSG_RESULT($LD)
else
  AC_MSG_RESULT(no)
fi
test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
AC_PROG_LD_GNU
])

AC_DEFUN([AC_PROG_LD_GNU],
[AC_CACHE_CHECK([if the linker ($LD) is GNU ld], ac_cv_prog_gnu_ld,
[# I'd rather use --version here, but apparently some GNU ld's only accept -v.
if $LD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
  ac_cv_prog_gnu_ld=yes
else
  ac_cv_prog_gnu_ld=no
fi])
with_gnu_ld=$ac_cv_prog_gnu_ld
])

AC_PROG_LD

AC_CHECK_SIZEOF([void *], 4)
AC_CHECK_SIZEOF([unsigned int], 4)
AC_CHECK_SIZEOF([unsigned long], 4)
AC_CHECK_SIZEOF([unsigned long long], 8)

dnl Check byte arrangement for doubleint routines
AC_C_BIGENDIAN

dnl Check for required header files
AC_HEADER_STDC

dnl Need either setenv or putenv
AC_CHECK_FUNCS(setenv putenv)

dnl Check for vfork
AC_CHECK_FUNC(vfork)

dnl Check for <dirent.h>
AC_CHECK_HEADERS(dirent.h)

dnl Check for <limits.h>
AC_CHECK_HEADERS(limits.h)

dnl Check for <param.h>
AC_CHECK_HEADERS(param.h)

dnl Check for Python3
AC_CHECK_PROG(HAVE_PYTHON3, python3, yes, no)

dnl Check for va_copy
AC_CACHE_CHECK([for va_copy], ac_cv_c_va_copy,
 AC_TRY_LINK(
   [#include <stdarg.h>],
   [va_list ap1, ap2;
    va_copy(ap1,ap2);
   ],
   [ac_cv_c_va_copy="yes"],
   [ac_cv_c_va_copy="no"])
 )
if test "$ac_cv_c_va_copy" = "yes"
then
    AC_DEFINE(HAVE_VA_COPY, 1, [Define if we have va_copy])
fi
AC_CACHE_CHECK([for __va_copy], ac_cv_c___va_copy,
 AC_TRY_LINK(
   [#include <stdarg.h>],
   [va_list ap1, ap2;
    __va_copy(ap1,ap2);
   ],
   [ac_cv_c___va_copy="yes"],
   [ac_cv_c___va_copy="no"])
 )
if test "$ac_cv_c___va_copy" = "yes"
then
    AC_DEFINE(HAVE___VA_COPY, 1, [Define if we have __va_copy])
fi

# Note that it is essential to disable the DBUG packages, as it is
# not ANSI-compliant and won't compile without quite a bit of work.
AC_DEFINE(DBUG_OFF)

stub_defs=""
extra_defs="$extra_defs -DCAD_DIR=\\\"\${LIBDIR}\\\""
X_LIBS=
X_CFLAGS=
CPPFLAGS=
INC_SPECS=
DEPEND_FLAG=
SHLIB_CFLAGS=""
LD_RUN_PATH=""
WISH_EXE=""
TCLSH_EXE=""
CXX=

modules=""
unused=""
cadinstall=""
extra_libs=""
other_srcs=""
top_extra_libs=""
sub_extra_libs=""
ld_extra_libs=""
ld_extra_objs=""
programs=""
rl_defs=
rl_libs=
gr_cflags=
gr_dflags=
gr_libs=
gr_srcs=
gr_hsrcs=
gr_hprog=

netgen_with_tcl="yes"
netgen_with_tk="yes"
netgen_with_tcl_includes=""
netgen_with_tk_includes=""
netgen_with_tcl_libraries=""
netgen_with_tk_libraries=""

dnl We will attempt to configure with Tcl/Tk and OpenGL.  However,
dnl if checks for the appropriate header and library files fail,
dnl we will revert to non-Tcl and/or non-OpenGL compilation.
dnl Compilation for Tcl/Tk may be explicitly prohibited by using
dnl --with-tcl=no or --with-interpreter=no, and OpenGL may be
dnl disabled with --with-opengl=no

usingTcl=1
usingX11=

dnl Compile-time options below. . .

# For distributed installs, where the run-time files are installed in a
# place that is a temporary staging area, like DESTDIR, but unlike DESTDIR,
# the prefix is replaced by the destination directory, rather than appended
# to it.
dist_prefix="\${exec_prefix}"
AC_ARG_WITH(distdir,
[  --with-distdir=DIR       install into location DIR for distribution], [
  if test "$withval" = "no" -o "$withval" = "NO" ; then
     dist_prefix="\${exec_prefix}"
  else
     dist_prefix=$arg
  fi
], )

AC_ARG_WITH(interpreter,
[  --with-interpreter=[arg]	enable interpreter], [
  if test "$withval" = "no" -o "$withval" = "NO"; then
    usingTcl=
  elif test "$withval" = "scheme" -o "$withval" = "SCHEME"; then
    usingScheme=1
    usingTcl=
  elif test "$withval" != "tcl" -a "$withval" != "TCL"; then
    echo "Unknown option to --with-interpreter:  Must be scheme, tcl, or no."
    exit 1
  fi
], )

AC_ARG_WITH(tcl,
[  --with-tcl=DIR          Find tclConfig.sh in DIR], [
  netgen_with_tcl=$withval
  if test "$withval" = "no" -o "$withval" = "NO"; then
    usingTcl=
  elif test $usingScheme ; then
    echo Attempt to enable both Tcl and Scheme interpreters.
    echo Disabling Tcl, and using Scheme instead.
    usingTcl=
  fi
], )

dnl ----------------------------------------------------------------
dnl Do our best to find Tcl/Tk.  If we can't, then flag a warning
dnl and don't set the usingTcl variable.
dnl
dnl This has been broken up into a number of sections, each of which
dnl depends independently on the setting of usingTcl.
dnl ----------------------------------------------------------------

AC_ARG_WITH(tk,         [  --with-tk=DIR           Find tkConfig.sh in DIR],
  netgen_with_tk=$withval)
AC_ARG_WITH(tclincls,   [  --with-tclincls=DIR     Find tcl.h in DIR],
  netgen_with_tcl_includes=$withval)
AC_ARG_WITH(tkincls,    [  --with-tkincls=DIR      Find tk.h in DIR],
  netgen_with_tk_includes=$withval)
AC_ARG_WITH(tcllibs,    [  --with-tcllibs=DIR      Find Tcl library in DIR],
  netgen_with_tcl_libraries=$withval)
AC_ARG_WITH(tklibs,     [  --with-tklibs=DIR       Find Tk library in DIR],
  netgen_with_tk_libraries=$withval)

# -----------------------------------------------------------------------
# Find the Tcl build configuration file "tclConfig.sh"
# -----------------------------------------------------------------------

if test $usingTcl ; then
  TCL_INC_DIR="."
  TK_INC_DIR="."

  AC_MSG_CHECKING([for tclConfig.sh])
  tcl_config_sh=""

  if test "$netgen_with_tcl" = "no" ; then
    netgen_with_tcl=""
  elif test "$netgen_with_tcl" != "yes" ; then
    #
    # Verify that a tclConfig.sh file exists in the directory specified
    # by --with-tcl.
    #
    for dir in \
     $netgen_with_tcl
    do
      if test -r "$dir/tclConfig.sh" ; then
        tcl_config_sh="$dir/tclConfig.sh"
        break
      elif test -r "$dir/lib/tclConfig.sh" ; then
        tcl_config_sh="$dir/lib/tclConfig.sh"
        break
      elif test -r "$dir/unix/tclConfig.sh" ; then
        tcl_config_sh="$dir/unix/tclConfig.sh"
        break
      fi
    done
  else
    #
    # Otherwise, search for Tcl configuration file.
    #

    #  1. Search previously named locations.

    for dir in \
     $ac_default_prefix \
     $exec_prefix
    do
      if test -r "$dir/tclConfig.sh" ; then
        tcl_config_sh="$dir/tclConfig.sh"
        break
      elif test -r "$dir/lib/tclConfig.sh" ; then
        tcl_config_sh="$dir/lib/tclConfig.sh"
        break
      elif test -r "$dir/unix/tclConfig.sh" ; then
        tcl_config_sh="$dir/unix/tclConfig.sh"
        break
      fi
    done

    #  2. Search standard locations.

    if test "x$tcl_config_sh" = "x" ; then
      for dir in \
       `ls -dr /usr/local/tcl/tcl[[7-9]].[[0-9]]* 2>/dev/null` \
       /usr/local/tcl \
       /usr/local/lib \
       /usr/lib64 \
       /usr/local \
       `ls -dr /usr/lib/tcl[[7-9]].[[0-9]]* 2>/dev/null` \
       /sw/lib \
       /usr
      do
        if test -r "$dir/tclConfig.sh" ; then
          tcl_config_sh="$dir/tclConfig.sh"
          break
        elif test -r "$dir/lib/tclConfig.sh" ; then
          tcl_config_sh="$dir/lib/tclConfig.sh"
          break
        fi
      done
    fi
  fi

  AC_MSG_RESULT([${tcl_config_sh}])

  if test "x$tcl_config_sh" = "x" ; then
    echo "Can't find Tcl configuration script \"tclConfig.sh\""
    echo "Reverting to non-Tcl compilation"
    usingTcl=
  fi
fi

# -----------------------------------------------------------------------
# Find the Tk build configuration file "tkConfig.sh"
# -----------------------------------------------------------------------

if test $usingTcl ; then

  AC_MSG_CHECKING([for tkConfig.sh])
  tk_config_sh=""
  if test "$netgen_with_tk" != "yes"; then
    #
    # Verify that a tkConfig.sh file exists in the directory specified
    # by --with-tcl or --with-tk.
    #
    for dir in \
     $netgen_with_tk \
     $netgen_with_tcl
    do
      if test -r "$dir/tkConfig.sh" ; then
        tk_config_sh="$dir/tkConfig.sh"
        break
      elif test -r "$dir/lib/tkConfig.sh" ; then
        tk_config_sh="$dir/lib/tkConfig.sh"
        break
      elif test -r "$dir/unix/tkConfig.sh" ; then
        tk_config_sh="$dir/unix/tkConfig.sh"
        break
      fi
    done
  else
    #
    # Search for Tk configuration file.
    #

    #
    #  1. Search previously named locations.
    #
    for dir in \
     $ac_default_prefix \
     $exec_prefix
    do
      if test -r "$dir/tkConfig.sh" ; then
        tk_config_sh="$dir/tkConfig.sh"
        break
      elif test -r "$dir/lib/tkConfig.sh" ; then
        tk_config_sh="$dir/lib/tkConfig.sh"
        break
      elif test -r "$dir/unix/tkConfig.sh" ; then
        tk_config_sh="$dir/unix/tkConfig.sh"
        break
      fi
    done
    #
    #  2. Search standard locations.
    #
    if test "x$tk_config_sh" = "x" ; then
      for dir in \
	`ls -dr /usr/local/tcl/tcl[[7-9]].[[0-9]]* 2>/dev/null` \
	`ls -dr /usr/local/tk/tk[[7-9]].[[0-9]]* 2>/dev/null` \
	/usr/local/tcl \
	/usr/local/lib \
	/usr/lib64 \
	/usr/local \
	`ls -dr /usr/lib/tcl[[7-9]].[[0-9]]* 2>/dev/null` \
	`ls -dr /usr/lib/tk[[7-9]].[[0-9]]* 2>/dev/null` \
	/sw/lib \
	${x_libraries} \
	/usr
      do
        if test -r "$dir/tkConfig.sh" ; then
          tk_config_sh="$dir/tkConfig.sh"
          break
        elif test -r "$dir/lib/tkConfig.sh" ; then
          tk_config_sh="$dir/lib/tkConfig.sh"
          break
        fi
      done
    fi
  fi
  AC_MSG_RESULT([${tk_config_sh}])

  if test "x$tk_config_sh" = "x" ; then
    echo "can't find Tk configuration script \"tkConfig.sh\""
    echo "Reverting to non-Tcl compilation"
    usingTcl=
  fi
fi

# -----------------------------------------------------------------------
# Source in the Tcl/Tk configuration scripts.
# -----------------------------------------------------------------------

if test $usingTcl ; then
  . $tcl_config_sh
  . $tk_config_sh

  # Should probably trust the config file contents, but this configure
  # file checks the Tcl and Tk include and lib directories.  Since
  # the config file doesn't separate out the libraries from the strings
  # passed to the compiler/linker, do it manually here.
  #
  # Extract TCL_LIB_DIR from TCL_LIB_SPEC
  # Extract TK_LIB_DIR from TK_LIB_SPEC
  # Extract TCL_INC_DIR from TCL_INCLUDE_SPEC
  # Extract TK_INC_DIR from TK_INCLUDE_SPEC
  #
  # These will be the defaults unless overridden by configure command line

  tmpstr=${TCL_LIB_SPEC#*-L}
  TCL_LIB_DIR=${tmpstr% -l*}
  tmpstr=${TK_LIB_SPEC#*-L}
  TK_LIB_DIR=${tmpstr% -l*}
  TCL_INC_DIR=${TCL_INCLUDE_SPEC#*-I}
  TK_INC_DIR=${TK_INCLUDE_SPEC#*-I}

  if test "$TCL_VERSION" = "7.6" -a "$TK_VERSION" = "4.2" ; then
    :
  elif test "$TCL_VERSION" = "7.5" -a "$TK_VERSION" = "4.1" ; then
    :
  elif test "$TCL_VERSION" = "$TK_VERSION" ; then
    :
  else
    echo "Mismatched Tcl/Tk versions ($TCL_VERSION != $TK_VERSION)"
    echo "Reverting to non-Tcl compile"
    usingTcl=
  fi
fi

if test $usingTcl ; then
  if test "x${netgen_with_tcl_includes}" != "x" ; then
    if test -r "${netgen_with_tcl_includes}/tcl.h" ; then
      TCL_INC_DIR=${netgen_with_tcl_includes}
    else
      echo "Can't find tcl.h in \"${netgen_with_tcl_includes}\""
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  else
    for dir in \
     ${TCL_PREFIX}/include/tcl${TCL_MAJOR_VERSION}.${TCL_MINOR_VERSION} \
     ${TCL_PREFIX}/include \
     ${TCL_SRC_DIR}/generic \
     ${TCL_INC_DIR}
    do
      if test -r "$dir/tcl.h" ; then
        TCL_INC_DIR=$dir
        break
      fi
    done
    if test "x${TCL_INC_DIR}" = "x" ; then
      echo "Can't find tcl.h header file"
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  fi
fi

if test $usingTcl ; then
  if test "x${netgen_with_tk_includes}" != "x" ; then
    if test -r "${netgen_with_tk_includes}/tk.h" ; then
      TK_INC_DIR=${netgen_with_tk_includes}
    else
      echo "Can't find tk.h in \"${netgen_with_tk_includes}\""
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  else
    for dir in \
     ${TK_PREFIX}/include/tk${TK_MAJOR_VERSION}.${TK_MINOR_VERSION} \
     ${TK_PREFIX}/include \
     ${TK_SRC_DIR}/generic \
     ${TK_INC_DIR} \
     ${TCL_INC_DIR}
    do
      if test -r "$dir/tk.h" ; then
        TK_INC_DIR=$dir
        break
      fi
    done
    if test "x${TK_INC_DIR}" = "x" ; then
      echo "Can't find tk.h header file"
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  fi
fi

if test $usingTcl ; then
  case $target in
    *-sunos4*|*-*-netbsd*|NetBSD-*|FreeBSD-*|OpenBSD-*)
      TCL_LIB_NAME="tcl${TCL_MAJOR_VERSION}${TCL_MINOR_VERSION}"
      TK_LIB_NAME="tk${TK_MAJOR_VERSION}${TK_MINOR_VERSION}"
      ;;
    *)
      TCL_LIB_NAME="tcl${TCL_MAJOR_VERSION}.${TCL_MINOR_VERSION}"
      TK_LIB_NAME="tk${TK_MAJOR_VERSION}.${TK_MINOR_VERSION}"
      ;;
  esac

  loclib=`echo ${TCL_LIB_SPEC} | sed -e 's/.*-L//' -e 's/ .*//'`

  if test "x${TCL_LIB_SPEC}" = "x" ; then
     TCL_LIB_SPEC="-l${TCL_LIB_NAME}"
  fi
  if test "x${TK_LIB_SPEC}" = "x" ; then
     TK_LIB_SPEC="-l${TK_LIB_NAME}"
  fi

# Find the version of "wish" that corresponds to TCL_EXEC_PREFIX
# We really ought to run "ldd" to confirm that the linked libraries match.

  AC_MSG_CHECKING([for wish executable])
  for dir in \
   ${TK_EXEC_PREFIX}/bin \
   ${TK_EXEC_PREFIX}
  do
    for wishexe in \
      wish \
      wish${TK_VERSION} \
      wish.exe \
      wish${TK_VERSION}.exe
    do
      if test -r "$dir/$wishexe" ; then
        WISH_EXE=$dir/$wishexe
        break
      fi
    done
    if test "x${WISH_EXE}" != "x" ; then
      break
    fi
  done
  if test "x${WISH_EXE}" = "x" ; then
    echo "Warning: Can't find executable for \"wish\".  You may have to"
    echo "manually set the value for WISH_EXE in the netgen startup script."
    AC_MSG_RESULT(no)
  else
    AC_MSG_RESULT([${WISH_EXE}])
  fi

# Find the version of "tclsh" that corresponds to TCL_EXEC_PREFIX

  AC_MSG_CHECKING([for tclsh executable])
  for dir in \
   ${TK_EXEC_PREFIX}/bin \
   ${TK_EXEC_PREFIX}
  do
    for tclshexe in \
      tclsh \
      tclsh${TK_VERSION} \
      tclsh.exe \
      tclsh${TK_VERSION}.exe
    do
      if test -r "$dir/$tclshexe" ; then
        TCLSH_EXE=$dir/$tclshexe
        break
      fi
    done
    if test "x${TCLSH_EXE}" != "x" ; then
      break
    fi
  done
  if test "x${TCLSH_EXE}" = "x" ; then
    echo "Warning: Can't find executable for \"tclsh\"."
    AC_MSG_RESULT(no)
  else
    AC_MSG_RESULT([${TCLSH_EXE}])
  fi

# Have to define SHDLIB_EXT here even though we have to do it below, too.
  case $target in
     *-hpux*)
        SHDLIB_EXT=".sl"
	SHDLIB_EXT_ALT=".sl"
        ;;
     *cygwin*)
        SHDLIB_EXT=".dll"
	SHDLIB_EXT_ALT=".dll.a"
	;;
     *darwin*)
        SHDLIB_EXT=".dylib"
	SHDLIB_EXT_ALT=".dylib"
        ;;
     *)
        SHDLIB_EXT=".so"
	SHDLIB_EXT_ALT=".so"
        ;;
  esac

  if test "x${netgen_with_tcl_libraries}" != "x" ; then
    for libname in \
     "${netgen_with_tcl_libraries}/lib${TCL_LIB_FILE}" \
     "${netgen_with_tcl_libraries}/lib${TCL_LIB_NAME}${SHDLIB_EXT}" \
     "${netgen_with_tcl_libraries}/lib${TCL_LIB_NAME}${SHDLIB_EXT_ALT}"
    do
      if test -r "$libname" ; then
        TCL_LIB_DIR="${netgen_with_tcl_libraries}"
        break
      fi
    done

    if test "x${TCL_LIB_DIR}" = "x" ; then
      echo "Can't find tcl library in \"${netgen_with_tcl_libraries}\""
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  else
    for libname in \
     "${loclib:=${TCL_EXEC_PREFIX}/lib}/lib${TCL_LIB_NAME}${SHDLIB_EXT}" \
     "${loclib:=${TCL_EXEC_PREFIX}/lib}/lib${TCL_LIB_NAME}${SHDLIB_EXT_ALT}" \
     "${loclib:=${TCL_EXEC_PREFIX}/lib64}/lib${TCL_LIB_NAME}${SHDLIB_EXT}"
    do
      if test -r "$libname" ; then
        TCL_LIB_DIR="${TCL_EXEC_PREFIX}/lib"
        break
      fi
    done
    if test "x${TCL_LIB_DIR}" = "x" ; then
      echo "Can't find tcl library"
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  fi
fi

if test $usingTcl ; then
  if test "x${netgen_with_tk_libraries}" != "x" ; then
    for libname in \
     "${netgen_with_tk_libraries}/${TCL_LIB_FILE}" \
     "${netgen_with_tk_libraries}/lib${TK_LIB_NAME}${SHDLIB_EXT}" \
     "${netgen_with_tk_libraries}/lib${TK_LIB_NAME}${SHDLIB_EXT_ALT}"
    do
      if test -r "$libname" ; then
        TK_LIB_DIR="${netgen_with_tk_libraries}"
        break
      fi
    done
    if test "x${TK_LIB_DIR}" = "x" ; then
      echo "Can't find tk library in \"${netgen_with_tk_libraries}\""
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  else
    for libname in \
     "${loclib:=${TK_EXEC_PREFIX}/lib}/lib${TK_LIB_NAME}${SHDLIB_EXT}" \
     "${loclib:=${TK_EXEC_PREFIX}/lib}/lib${TK_LIB_NAME}${SHDLIB_EXT_ALT}" \
     "${loclib:=${TK_EXEC_PREFIX}/lib64}/lib${TK_LIB_NAME}${SHDLIB_EXT}"
    do
      if test -r "$libname" ; then
        TK_LIB_DIR="${TK_EXEC_PREFIX}/lib"
        break
      fi
    done
    if test "x${TK_LIB_DIR}" = "x" ; then
      echo "Can't find tk library"
      echo "Reverting to non-Tcl compile"
      usingTcl=
    fi
  fi
fi

dnl ----------------------------------------------------
dnl End of Tcl/Tk search
dnl ----------------------------------------------------

dnl The X11 version of the non-Tcl-based netgen is so awful
dnl we don't really want to advertise it.  So, you have to
dnl specifically do "--with-widgets=" to get HAVE_X11 set;
dnl otherwise, you get the command-line interface, which is
dnl much more pleasant.

AC_ARG_WITH(widgets,
[  --with-widgets=[arg]            select widget set], [
   if test "$withval" = "xw" -o "$withval" = "Xw"; then
      usingX11=1
      usingTcl=
      gr_dflags="${gr_dflags} -DHAVE_X11 -DX11_HP_WIDGETS"
      gr_libs="${gr_libs} -lXw -lXt"
   elif test "$withval" = "Xm" -o "$withval" = "Motif"; then
      usingX11=1
      usingTcl=
      gr_dflags="${gr_dflags} -DHAVE_X11 -DX11_MOTIF_WIDGETS"
      gr_libs="${gr_libs} -lXm -lXt"
   else
      usingX11=1
      usingTcl=
      gr_dflags="${gr_dflags} -DHAVE_X11 -DX11_ATHENA_WIDGETS"
      gr_libs="${gr_libs} -lXaw -lXmu -lXt -lXext"
   fi
], )

dnl Check for X enabled/disabled

AC_PATH_XTRA
if test "x$no_x" != "x"; then
  if test $usingX11 ; then
     echo Cannot find X11---will attempt to compile anyway.
     echo Graphics options will be NULL only!
     usingX11=
  fi
  if test $usingTcl ; then
    echo "Cannot compile TCL version without X11, disabling."
    usingTcl=
  fi
fi

dnl ----------------------------------------------------------------
dnl Once we're sure what, if any, interpreter is being compiled,
dnl set all the appropriate definitions.  For Tcl/Tk, override
dnl the default install targets: allows compiling tcl version with
dnl "make" instead of requiring "make tcl"
dnl ----------------------------------------------------------------

if test $usingTcl ; then
  usingX11=1
  cadinstall="$cadinstall tcltk"
  modules="$modules tcltk"
  programs="$programs tcltk"
  ALL_TARGET="tcl"
  INSTALL_TARGET="install-tcl"
  AC_DEFINE(TCL_NETGEN)
  extra_libs="$extra_libs \${NETGENDIR}/tcltk/libtcltk.o"
  extra_defs="$extra_defs -DTCL_DIR=\\\"\${TCLDIR}\\\""
  stub_defs="$stub_defs -DUSE_TCL_STUBS -DUSE_TK_STUBS"
else
  programs="$programs netgen"
  unused="$unused tcltk"
fi

dnl If usingAthena is set, and we are using X11, then no widget
dnl set has been selected with "--with-widgets", so we default
dnl to the X11 Athena widget set.

dnl ----------------------------------------------------------------
dnl Handle graphics based on the setting of "usingTcl", "usingX11",
dnl "usingOGL", and "usingBLT"
dnl ----------------------------------------------------------------

if test $usingTcl ; then
  if test $usingX11 ; then
     gr_dflags="$gr_dflags -DX11 -DXLIB"
     gr_libs="$gr_libs -lX11"
     gr_srcs="$gr_srcs \${TK_SRCS}"
  else
     gr_srcs="$gr_srcs \${NULL_SRCS}"
  fi
else
  if test $usingX11 ; then
    gr_dflags="$gr_dflags -DX11 -DXLIB"
    gr_libs="$gr_libs -lX11"
    gr_srcs="$gr_srcs \${X11_SRCS}"
  fi
fi

dnl ----------------------------------------------------------------
dnl Define system-specific settings
dnl ----------------------------------------------------------------

case $target in
  *-linux*)
    AC_DEFINE(linux)
    AC_DEFINE(SYSV)
    dnl Defining "ISC" prevents compiler failure on redefinition of "wchar_t"
    AC_DEFINE(ISC)
    dnl 64-bit support for AMD Opteron
    case $target in
        *x86_64*)
            CFLAGS="${CFLAGS} -m64 -fPIC"
            ;;
    esac
    if test -f /usr/lib/libbsd-compat.a ; then
      gr_libs="$gr_libs -lbsd-compat"
    elif test -f /usr/lib/libbsd.a ; then
      gr_libs="$gr_libs -lbsd"
    fi
    ;;
  *solaris*)
    AC_DEFINE(SYSV)
    ;;
  *irix*)
    AC_DEFINE(SYSV)
    AC_DEFINE(IRIX)
    AC_DEFINE(_BSD_SIGNALS)
    ;;
  *sysv*)
    AC_DEFINE(SYSV)
    ;;
  *cygwin*)
    AC_DEFINE(CYGWIN)
    AC_DEFINE(i386)
    ;; 
  *darwin*)
    $as_echo "#define macosx macos" >> confdefs.h
    if test "$CPP" = "cc -E" ; then
       CPPFLAGS="$CPPFLAGS -no-cpp-precomp"
    fi
    ;;
esac
# -----------------------------------------------------------------------
# Tcl/Tk configuration
# -----------------------------------------------------------------------

if test $usingTcl ; then
    LIB_SPECS_NOSTUB="${LIB_SPECS}"

# -----------------------------------------------------------------------
#
# Tk libraries and header files
#
# -----------------------------------------------------------------------
  if test "${TK_INC_DIR}" != "/usr/include" ; then
    INC_SPECS="${INC_SPECS} -I${TK_INC_DIR}"
  fi
  if test "${TK_LIB_DIR}" = "/usr/lib" -o \
        "${TK_LIB_DIR}" = "/usr/lib64" ; then
    LIB_SPECS_NOSTUB="${LIB_SPECS_NOSTUB} ${TK_LIB_SPEC}"
    LIB_SPECS="${LIB_SPECS} ${TK_STUB_LIB_SPEC}"
  else
    LIB_SPECS_NOSTUB="${LIB_SPECS_NOSTUB} -L${TK_LIB_DIR} ${TK_LIB_SPEC}"
    LIB_SPECS="${LIB_SPECS} -L${TK_LIB_DIR} ${TK_STUB_LIB_SPEC}"
    if test "x${loader_run_path}" = "x" ; then
      loader_run_path="${TK_LIB_DIR}"
    else
      loader_run_path="${TK_LIB_DIR}:${loader_run_path}"
    fi
  fi

# -----------------------------------------------------------------------
#
# Tcl libraries and header files
#
# Add a header file directory specification only if the Tcl headers reside
# in a different directory from Tk's.
#
## -----------------------------------------------------------------------
  if test "${TCL_INC_DIR}" != "/usr/include" -a \
        "${TCL_INC_DIR}" != "${TK_INC_DIR}" ; then
    INC_SPECS="${INC_SPECS} -I${TCL_INC_DIR}"
  fi

  if test "${TCL_LIB_DIR}" = "/usr/lib" -o \
        "${TCL_LIB_DIR}" = "/usr/lib64" -o \
        "${TCL_LIB_DIR}" = "${TK_LIB_DIR}" ; then
    LIB_SPECS_NOSTUB="${LIB_SPECS_NOSTUB} ${TCL_LIB_SPEC}"
    LIB_SPECS="${LIB_SPECS} ${TCL_STUB_LIB_SPEC}"
  else
    LIB_SPECS_NOSTUB="${LIB_SPECS_NOSTUB} -L${TCL_LIB_DIR} ${TCL_LIB_SPEC}"
    LIB_SPECS="${LIB_SPECS} -L${TCL_LIB_DIR} ${TCL_STUB_LIB_SPEC}"
    if test "x${loader_run_path}" = "x" ; then
      loader_run_path="${TCL_LIB_DIR}"
    else
      loader_run_path="${TCL_LIB_DIR}:${loader_run_path}"
    fi
  fi

#--------------------------------------------------------------------
#
# Check if we can generate shared libraries on this system.  Set flags
# to generate shared libraries for systems that we know about.  Start
# with the values found in tclConfig.sh, make changes as we know about
# the different systems.
#
#--------------------------------------------------------------------

# Initialize shared library build variables

  SHLIB_LD=""
  LDDL_FLAGS="-shared"
  SHDLIB_EXT=".so"
  EXTRA_LIB_SPECS=""

  build_shared="yes"

  case $target in
    *-aix4.[[2-9]]*)
      # No Position-Independent flags needed

      # Use the installed export file or the one found in the source directory.

      if test -r "${TCL_LIB_DIR}/lib${TCL_LIB_NAME}.exp" ; then
        tcl_exp="${TCL_LIB_DIR}/lib${TCL_LIB_NAME}.exp"
      else
        tcl_exp="${TCL_SRC_DIR}/unix/lib.exp"
      fi
      if test -r "${TK_LIB_DIR}/lib${TK_LIB_NAME}.exp" ; then
        tk_exp="${TK_LIB_DIR}/lib${TK_LIB_NAME}.exp"
      else
        tk_exp="${TK_SRC_DIR}/unix/lib.exp"
      fi

      full_src_path=`cd ${srcdir}; pwd`

      # Use shell-script to link shared library
      LD="${full_src_path}/cf/ldAix /bin/ld -bhalt:4 -bM:SRE -bE:lib.exp -H512 -T512 -bnoentry -bI:${tk_exp} -bI:${tcl_exp}"

      SHLIB_LIB_SPECS="${aix_lib_specs} -lc"

      LDFLAGS="-L${loader_run_path}"
      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-aix*)
      # No Position-Independent flags needed

      # Use the installed export file or the one found in the source directory.

      if test -r "${TCL_LIB_DIR}/lib${TCL_LIB_NAME}.exp" ; then
        tcl_exp="${TCL_LIB_DIR}/lib${TCL_LIB_NAME}.exp"
      else
        tcl_exp="${TCL_SRC_DIR}/unix/lib.exp"
      fi
      if test -r "${TK_LIB_DIR}/lib${TK_LIB_NAME}.exp" ; then
        tk_exp="${TK_LIB_DIR}/lib${TK_LIB_NAME}.exp"
      else
        tk_exp="${TK_SRC_DIR}/unix/lib.exp"
      fi

      full_src_path=`cd ${srcdir}/cf; pwd`

      # Use shell-script to link shared library

      LD="${full_src_path}/ldAix /bin/ld -bhalt:4 -bM:SRE -bE:lib.exp -H512 -T512 -bnoentry -bI:${tk_exp} -bI:${tcl_exp}"
      SHLIB_LIB_SPECS="${aix_lib_specs} -lc"
      LDFLAGS="-L${loader_run_path}"
      EXTRA_LIB_SPECS="-lld"
      ;;

    *-bsdi2*|*-bsdi3*)
      LD="shlicc"
      LDDL_FLAGS="-r"
      EXTRA_LIB_SPECS="-ldl"
      ;;

    *darwin*)
      SHDLIB_EXT=".dylib"
      LDDL_FLAGS="-dynamiclib -flat_namespace -undefined suppress -noprebind"
      LDFLAGS="${LDFLAGS} ${LIB_SPECS}"
      CFLAGS="${CFLAGS} ${X_CFLAGS} ${INC_SPECS} -I/sw/include -fno-common"
      ;;

    *cygwin*)
      SHDLIB_EXT=".dll"
      AC_DEFINE(USE_DL_IMPORT)
      LDDL_FLAGS='-shared -Wl,--enable-auto-image-base'
      if test "x${loader_run_path}" != "x" ; then
        LD_RUN_PATH="${LD_RUN_PATH} -Wl,-rpath,${loader_run_path}"
      fi
      ld_extra_libs=${LIB_SPECS}
      sub_extra_libs='-L${NETGENDIR}/netgen -ltclnetgen'
      ;;

    *-bsdi4*)
      SHLIB_CFLAGS="-export-dynamic -fPIC"
      LDDL_FLAGS='-shared -Wl,-E -Wl,-soname,$@'
      ;;

    *-dgux*)
      SHLIB_CFLAGS="-K PIC"
      LDDL_FLAGS="-G"
     EXTRA_LIB_SPECS="-ldl"
      ;;

    *-hpux*)
      if test "$GCC" = "no" ; then
        AC_DEFINE(_HPUX_SOURCE)
      fi
      AC_CHECK_LIB(dld, shl_load, [found=yes], [found=no])
      if test "${found}" = "yes" ; then
        SHLIB_CFLAGS="+z"
        LDDL_FLAGS="-b -E -n +s +b,${loader_run_path}:."
        SHDLIB_EXT=".sl"

        # The run path is included in both LDFLAGS and LDDL_FLAGS
        # because SHLIB_LD is ld and LD is cc/gcc.

        LDFLAGS="-Wl,-E -Wl,+s,+b,${loader_run_path}:."
        EXTRA_LIB_SPECS="-ldld"
      fi
      ;;

    *-irix64-6.5*)
      LDDL_FLAGS="-32 -shared -rdata_shared"
      if test "x${loader_run_path}" != "x" ; then
        LD_RUN_PATH="${LD_RUN_PATH} -Wl,-rpath,${loader_run_path}"
      fi
      ;;

    *-irix-[56].*|*-irix64-*)
      LDDL_FLAGS="-shared -rdata_shared"
      if test "x${loader_run_path}" != "x" ; then
        LD_RUN_PATH="${LD_RUN_PATH} -Wl,-rpath,${loader_run_path}"
      fi
      LDFLAGS=""
      if test "$GCC" = "yes" ; then
        SHLIB_CFLAGS="-mabi=n32 $SHLIB_CFLAGS"
        LDDL_FLAGS="-mabi=n32 $LDDL_FLAGS"
        LDFLAGS="-mabi=n32 $LDFLAGS"
      else
        CFLAGS="-n32 $CFLAGS"
        LDFLAGS="-n32 $LDFLAGS"
      fi
      ;;

    *-linux*)
      LDDL_FLAGS=' -shared -Wl,-soname,$@'
      if test "x${loader_run_path}" != "x" ; then
        LD_RUN_PATH="${LD_RUN_PATH} -Wl,-rpath,${loader_run_path}"
      fi
      LDFLAGS=""
      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-mp-ras-02*)
      SHLIB_CFLAGS="-G -K PIC"
      LDDL_FLAGS=""
      ;;

    *-mp-ras-*)
      SHLIB_CFLAGS="-G -K PIC"
      LDDL_FLAGS="-Wl,-Bexport"
      ;;

    *-ncr-sysv4-*2*)
      SHLIB_CFLAGS="-K PIC"
      LDDL_FLAGS="-G"

      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-ncr-sysv4*)
      SHLIB_CFLAGS="-K PIC"
      LDDL_FLAGS="-G -Wl,-Bexport"

      LDFLAGS="-Wl,-Bexport"
      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-freebsd*)
      # Not available on all versions:  check for include file.
      SHLIB_CFLAGS="-fpic"
      LDDL_FLAGS="-shared ${LIB_SPECS}"
      CFLAGS="${CFLAGS} -L/usr/X11R6/include"
      ;;

    *-netbsd*|*-openbsd*)
      # Not available on all versions:  check for include file.
      AC_CHECK_HEADER(dlfcn.h, test_ok=yes, test_ok=no)
      if test "$test_ok" = yes; then
        SHLIB_CFLAGS="-fPIC"
        LDDL_FLAGS="-shared ${LIB_SPEC}"
      fi
      ;;

    *-nextstep*)
      LDDL_FLAGS="-nostdlib -r"
      ;;

    *-osf1-1.[012]*)
      # OSF/1 1.[012] from OSF, and derivatives, including Paragon OSF/1

      # Warning: Ugly Makefile Hack
      # Make package name same as library name

      SHLIB_LD='ld -R -export $@:'
      ;;

    *-osf1-1.*)
      # OSF/1 1.3 from OSF using ELF, and derivatives, including AD2

      SHLIB_CFLAGS="-fpic"
      SHLIB_LD="ld -shared"
      ;;

    *-osf1V*)
      # Digital OSF/1

      LDDL_FLAGS='-shared -expect_unresolved "*"'
      if test "x${loader_run_path}" != "x" ; then
        LD_RUN_PATH="${LD_RUN_PATH} -Wl,-rpath,${loader_run_path}"
      fi
      LDFLAGS=""
      ;;

    *-sco*)
      # Note, dlopen is available only on SCO 3.2.5 and greater.  However,
      # this test works, since "uname -s" was non-standard in 3.2.4 and
      # below.

      SHLIB_CFLAGS="-Kpic -belf"
      LDDL_FLAGS="-G"
      LDFLAGS="-belf -Wl,-Bexport"
      ;;

    *-sni-sysv*)

      SHLIB_CFLAGS="-K PIC"
      LDDL_FLAGS="-G"

      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-sunos4*)

      SHLIB_CFLAGS="-PIC"
      LDDL_FLAGS="-assert pure-text"

      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-solaris2*)

      if test "$with_gnu_ld" = "yes" ; then
        LDDL_FLAGS='-shared -Wl,-E -Wl,-soname,$@ ${LIB_SPEC}'
        if test "x${loader_run_path}" != "x" ; then
          LD_RUN_PATH="${LD_RUN_PATH} -Wl,-rpath,${loader_run_path}"
        fi
      else
        LDDL_FLAGS="-shared -mimpure-text"
        if test "x${loader_run_path}" != "x" ; then
          LD_RUN_PATH="${LD_RUN_PATH} -R ${loader_run_path}"
        fi
      fi
      EXTRA_LIB_SPECS="-ldl"
    ;;

    *-mips-dde-sysv*)

      SHLIB_CFLAGS="-KPIC"
      LDDL_FLAGS="-G"

      EXTRA_LIB_SPECS="-ldl"
      ;;

    *-pc-sysv4* | *-unixware-5*)
      SHLIB_CFLAGS="-G -KPIC"
      LDDL_FLAGS=" -Wl,-Bexport"
      ;;

  esac

# If we're running gcc, then set SHLIB_CFLAGS flags for compiling
# shared libraries for gcc, instead of those of the vendor's compiler.

  if test "$GCC" = "yes" ; then
    case $target in
      *cygwin*)
        ;;
      *)
        SHLIB_CFLAGS="-fPIC"
        ;;
    esac
  fi
  if test "$with_gnu_ld" = "yes" ; then
    LDDL_FLAGS="${LDDL_FLAGS} -Wl,--version-script=\${NETGENDIR}/netgen/symbol.map"
  fi

  AC_SUBST(SHDLIB_EXT)
  AC_SUBST(SHLIB_LD)
  AC_SUBST(LD)
  AC_SUBST(LDDL_FLAGS)
  AC_SUBST(SHLIB_LIB_SPECS)

  AC_SUBST(EXTRA_LIB_SPECS)
  AC_SUBST(LDFLAGS)
  AC_SUBST(INC_SPECS)
  AC_SUBST(LIB_SPECS)
  AC_SUBST(LIB_SPECS_NOSTUB)
  AC_SUBST(WISH_EXE)
  AC_SUBST(TCLSH_EXE)
  AC_SUBST(TCL_LIB_DIR)

fi

if test "$GCC" = "yes" ; then
   DEPEND_FLAG="-MM"
fi

dnl Substitute all variables

AC_SUBST(VERSION)
AC_SUBST(PACKAGE)
AC_SUBST(SCRIPTS)
AC_SUBST(extra_libs)
AC_SUBST(extra_defs)
AC_SUBST(stub_defs)
AC_SUBST(ld_extra_libs)
AC_SUBST(ld_extra_objs)
AC_SUBST(top_extra_libs)
AC_SUBST(sub_extra_libs)
AC_SUBST(modules)
AC_SUBST(unused)
AC_SUBST(programs)
AC_SUBST(cadinstall)
AC_SUBST(dist_prefix)

AC_SUBST(gr_cflags)
AC_SUBST(gr_dflags)
AC_SUBST(gr_libs)
AC_SUBST(gr_srcs)
AC_SUBST(HAVE_PYTHON3)

AC_SUBST(X_LIBS)
AC_SUBST(X_CFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(CFLAGS)
AC_SUBST(DEPEND_FLAG)
AC_SUBST(SHLIB_CFLAGS)
AC_SUBST(LD_RUN_PATH)

AC_SUBST(ALL_TARGET)
AC_SUBST(INSTALL_TARGET)

AC_OUTPUT(defs.mak)

dnl
dnl Print configuration and report problems

ECHO_N=printf

echo
echo "-----------------------------------------------------------"
echo "Configuration Summary (principle requirements):"
echo

${ECHO_N} "Tcl/Tk:      "
if test $usingTcl ; then
   echo "yes"
else
   echo "no"
   echo
   echo "   Without Tcl/Tk, you cannot run the enhanced version of netgen"
   echo "   with scripting ability, console window, convenience commands"
   echo "   such as \"lvs\", and other useful features.  If you did not"
   echo "   specifically disable Tcl/Tk on the configure command line, then" 
   echo "   getting this message means that you do not have Tcl/Tk headers"
   echo "   and/or libraries installed, or they are not in a standard path."
   echo "   Try using configure options --with-tcl=<DIR> and --with-tk=<DIR>."
   echo
fi

${ECHO_N} "Python3:    "
if test "${HAVE_PYTHON3}" == "yes"; then
   echo "yes"
else
   echo "no"
   echo
   echo "   Without Python3, you cannot run the GUI interface to netgen."
   echo "   This is purely optional, as it contains no features not"
   echo "   available in the command-line (Tcl/Tk) version.  If you want"
   echo "   python3 support, make sure that you have installed python3"
   echo "   on your system."
   echo
fi

echo "-----------------------------------------------------------"
echo

echo "Use 'make' to compile and 'make install' to install."
echo
echo "Errors may not be printed to stdout:  see files 'make.log' "
echo "   and 'install.log' for a complete error summary."
echo
echo "-----------------------------------------------------------"
echo

dnl Put "defs.mak" in the top-level directory
cp defs.mak ..