diff --git a/panda/src/gobj/Sources.pp b/panda/src/gobj/Sources.pp
index 54fb0e9af6..cafabf8ba4 100644
--- a/panda/src/gobj/Sources.pp
+++ b/panda/src/gobj/Sources.pp
@@ -1,5 +1,6 @@
 #define OTHER_LIBS interrogatedb:c dconfig:c dtoolconfig:m \
                    dtoolutil:c dtoolbase:c dtool:m prc:c
+#define USE_PACKAGES cg
 #define OSX_SYS_LIBS mx
 
 #begin lib_target