diff --git a/python-pw3270.cbp b/python-pw3270.cbp
index b2b3ab7..1cce649 100644
--- a/python-pw3270.cbp
+++ b/python-pw3270.cbp
@@ -3,6 +3,7 @@
 	<FileVersion major="1" minor="6" />
 	<Project>
 		<Option title="Python binding for pw3270/lib3270" />
+		<Option makefile_is_custom="1" />
 		<Option pch_mode="2" />
 		<Option compiler="gcc" />
 		<Build>
--
libgit2 0.21.2