clipper source added to lib/clipper, not tested

libs/CMakeLists.txt

 add_subdirectory(qtandroidserialport)
 add_subdirectory(qwt)
 add_subdirectory(shapelib)
+add_subdirectory(clipper)

libs/clipper/CMakeLists.txt

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+
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+# The header name clipper.hpp is too generic, so install in a subdirectory
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+
+SET(BUILD_SHARED_LIBS ON CACHE BOOL
+    "Build shared libraries (.dll/.so) instead of static ones (.lib/.a)")
+ADD_LIBRARY(polyclipping clipper.cpp)
+
+CONFIGURE_FILE (polyclipping.pc.cmakein "${PCFILE}" @ONLY)
+
+INSTALL (FILES clipper.hpp DESTINATION "${CMAKE_INSTALL_INCDIR}")
+INSTALL (TARGETS polyclipping LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+INSTALL (FILES "${PCFILE}" DESTINATION "${CMAKE_INSTALL_PKGCONFIGDIR}")
+
+SET_TARGET_PROPERTIES(polyclipping PROPERTIES VERSION 22.0.0 SOVERSION 22 )

libs/clipper/Makefile

+# CMAKE generated file: DO NOT EDIT!
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+
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+	$(MAKE) -f CMakeFiles/Makefile2 all
+	$(CMAKE_COMMAND) -E cmake_progress_start /home/valentin/Desktop/drones/qgroundcontrol/libs/clipper/CMakeFiles 0
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+.PHONY : clipper.cpp.s
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+# Help Target
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+	@echo "... all (the default if no target is provided)"
+	@echo "... clean"
+	@echo "... depend"
+	@echo "... install/strip"
+	@echo "... edit_cache"
+	@echo "... install"
+	@echo "... rebuild_cache"
+	@echo "... list_install_components"
+	@echo "... polyclipping"
+	@echo "... install/local"
+	@echo "... clipper.o"
+	@echo "... clipper.i"
+	@echo "... clipper.s"
+.PHONY : help
+
+
+
+#=============================================================================
+# Special targets to cleanup operation of make.
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+# Special rule to run CMake to check the build system integrity.
+# No rule that depends on this can have commands that come from listfiles
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libs/clipper/cmake_install.cmake

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libs/clipper/polyclipping.pc

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+sharedlibdir=/usr/local/lib
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+Name: polyclipping
+Description: polygon clipping library
+Version: 
+
+Requires:
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+Cflags: -I${includedir}

libs/clipper/polyclipping.pc.cmakein

+prefix=@CMAKE_INSTALL_PREFIX@
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+Name: polyclipping
+Description: polygon clipping library
+Version: @VERSION@
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+Requires:
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+Cflags: -I${includedir}