diff --git a/src/klayout.pri b/src/klayout.pri
index 092bb5c3a..a34f144b9 100644
--- a/src/klayout.pri
+++ b/src/klayout.pri
@@ -121,6 +121,7 @@ msvc {
       -Wno-strict-aliasing \
       -Wno-deprecated-declarations \
       -Wno-reserved-user-defined-literal \
+      -std=c++11 \
 
   win32 {
     QMAKE_LFLAGS += -Wl,--exclude-all-symbols
diff --git a/src/plugins/tools/net_tracer/lay_plugin/layNetTracerDialog.cc b/src/plugins/tools/net_tracer/lay_plugin/layNetTracerDialog.cc
index bcdd8038e..8b6858afa 100644
--- a/src/plugins/tools/net_tracer/lay_plugin/layNetTracerDialog.cc
+++ b/src/plugins/tools/net_tracer/lay_plugin/layNetTracerDialog.cc
@@ -49,7 +49,7 @@
 
 namespace db
 {
-  DB_PLUGIN_PUBLIC std::string net_tracer_component_name;
+  extern std::string net_tracer_component_name;
 }
 
 namespace lay
diff --git a/src/tl/tl/tlStream.cc b/src/tl/tl/tlStream.cc
index 157a6dc6f..fcc6dc2b1 100644
--- a/src/tl/tl/tlStream.cc
+++ b/src/tl/tl/tlStream.cc
@@ -552,7 +552,7 @@ InputZLibFile::InputZLibFile (const std::string &path)
   }
   mp_d->zs = gzdopen (fd, "rb");
 #else
-  m_zs = gzopen (tl::string_to_system (path).c_str (), "rb");
+  mp_d->zs = gzopen (tl::string_to_system (path).c_str (), "rb");
 #endif
   if (mp_d->zs == NULL) {
     throw FileOpenErrorException (m_source, errno);
@@ -826,7 +826,7 @@ OutputZLibFile::OutputZLibFile (const std::string &path)
   }
   mp_d->zs = gzdopen (_fileno (file), "wb");
 #else
-  m_zs = gzopen (tl::string_to_system (path).c_str (), "wb");
+  mp_d->zs = gzopen (tl::string_to_system (path).c_str (), "wb");
 #endif
   if (mp_d->zs == NULL) {
     throw FileOpenErrorException (m_source, errno);
diff --git a/src/tl/tl/tlTimer.cc b/src/tl/tl/tlTimer.cc
index f117d06e9..1be9d0b81 100644
--- a/src/tl/tl/tlTimer.cc
+++ b/src/tl/tl/tlTimer.cc
@@ -114,7 +114,7 @@ static int64_t ms_time ()
 #else
 
   timespec ts;
-  clock_gettime(CLOCK_REALTIME, ts);
+  clock_gettime (CLOCK_REALTIME, &ts);
   return int64_t (ts.tv_sec) * 1000 + int64_t (0.5 + ts.tv_nsec / 1.0e6);
 
 #endif