diff --git a/pandatool/src/imagebase/Sources.pp b/pandatool/src/imagebase/Sources.pp
index ab34a911d1..4074d4c642 100644
--- a/pandatool/src/imagebase/Sources.pp
+++ b/pandatool/src/imagebase/Sources.pp
@@ -5,10 +5,15 @@
   #define OTHER_LIBS \
     pnmimage:c panda:m
 
+  #define COMBINED_SOURCES $[TARGET]_composite1.cxx 
+
   #define SOURCES \
-    imageBase.cxx imageBase.h imageFilter.cxx imageFilter.h \
-    imageReader.cxx imageReader.h imageWriter.I imageWriter.cxx \
-    imageWriter.h
+    imageReader.h imageWriter.I imageWriter.h \
+    imageBase.h imageFilter.h
+    
+  #define INCLUDED_SOURCES \
+    imageBase.cxx imageFilter.cxx \
+    imageReader.cxx imageWriter.cxx
 
   #define INSTALL_HEADERS \
     imageBase.h imageFilter.h imageReader.h imageWriter.I imageWriter.h
diff --git a/pandatool/src/imagebase/imagebase_composite1.cxx b/pandatool/src/imagebase/imagebase_composite1.cxx
new file mode 100644
index 0000000000..35b2075338
--- /dev/null
+++ b/pandatool/src/imagebase/imagebase_composite1.cxx
@@ -0,0 +1,6 @@
+
+#include "imageBase.cxx"
+#include "imageFilter.cxx"
+#include "imageReader.cxx"
+#include "imageWriter.cxx"
+