diff -up CuraEngine-lulzbot-2.6.21/CMakeLists.txt.system CuraEngine-lulzbot-2.6.21/CMakeLists.txt
--- CuraEngine-lulzbot-2.6.21/CMakeLists.txt.system	2017-08-08 16:48:47.417841577 -0400
+++ CuraEngine-lulzbot-2.6.21/CMakeLists.txt	2017-08-08 16:49:39.185616892 -0400
@@ -47,9 +47,7 @@ if (ENABLE_OPENMP)
     endif()
 endif()
 
-include_directories(${CMAKE_CURRENT_BINARY_DIR} libs)
-
-add_library(clipper STATIC libs/clipper/clipper.cpp)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 set(engine_SRCS # Except main.cpp.
     src/bridge.cpp
@@ -140,7 +138,7 @@ endif ()
 
 # Compiling CuraEngine itself.
 add_library(_CuraEngine ${engine_SRCS} ${engine_PB_SRCS}) #First compile all of CuraEngine as library, allowing this to be re-used for tests.
-target_link_libraries(_CuraEngine clipper)
+target_link_libraries(_CuraEngine polyclipping)
 if (ENABLE_ARCUS)
     target_link_libraries(_CuraEngine Arcus)
 endif ()