Index: lib3mf.pc.in
--- lib3mf.pc.in.orig
+++ lib3mf.pc.in
@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=@CMAKE_INSTALL_PREFIX@
 libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+includedir=${prefix}/@LIB3MF_INSTALL_INCLUDEDIR@
 
 Name: @PROJECT_NAME@
 Description: @PROJECT_DESCRIPTION@
