--- a/openscad.pro
+++ b/openscad.pro
@@ -440,8 +440,7 @@ SOURCES += src/version_check.cc \
- src/LibraryInfoDialog.cc
-
+ HEADERS += src/ext/lodepng/lodepng.h
+
# ClipperLib
-SOURCES += src/ext/polyclipping/clipper.cpp
-HEADERS += src/ext/polyclipping/clipper.hpp
+LIBS += -lpolyclipping
# libtess2
- INCLUDEPATH += src/libtess2/Include
+ INCLUDEPATH += src/ext/libtess2/Include
diff --git a/src/clipper-utils.h b/src/clipper-utils.h
index 0dc7cd0..c98cda0 100644
--- a/src/clipper-utils.h