--- CMakeLists.txt.orig	2020-12-24 21:32:13 UTC
+++ CMakeLists.txt
@@ -44,6 +44,6 @@ set(SIP_EXTRA_FILES_DEPEND
     src/String.sip
 )
 
-set(SIP_EXTRA_OPTIONS -g)  # Always release the GIL before calling C++ methods.
+set(SIP_EXTRA_OPTIONS -g -n PyQt5.sip)  # Always release the GIL before calling C++ methods.
 include_directories(src/ ${SIP_INCLUDE_DIRS} ${Python3_INCLUDE_DIRS} ${CLIPPER_INCLUDE_DIRS} ${NLopt_INCLUDE_DIRS} ${LIBNEST2D_INCLUDE_DIRS})
 add_sip_python_module(pynest2d src/Pynest2D.sip ${CLIPPER_LIBRARIES} ${NLopt_LIBRARIES})
