Index: src/Mod/Part/App/CMakeLists.txt
--- src/Mod/Part/App/CMakeLists.txt.orig
+++ src/Mod/Part/App/CMakeLists.txt
@@ -26,6 +26,7 @@ set(Part_LIBS
     ${OCC_DEBUG_LIBRARIES}
     FreeCADApp
     Materials
+    -L${X11BASE}/lib
 )
 
 if(FREETYPE_FOUND)
