diff --git a/direct/src/dcparser/dcbase.h b/direct/src/dcparser/dcbase.h
index 3a2cee82ea..55a32a12e1 100644
--- a/direct/src/dcparser/dcbase.h
+++ b/direct/src/dcparser/dcbase.h
@@ -37,7 +37,7 @@
 #include "pvector.h"
 #include "pmap.h"
 
-#else
+#else  // WITHIN_PANDA
 
 #ifdef WIN32
 /* C4786: 255 char debug symbols */
diff --git a/direct/src/dcparser/primeNumberGenerator.h b/direct/src/dcparser/primeNumberGenerator.h
index 1ef35a3ec4..fde83cc313 100644
--- a/direct/src/dcparser/primeNumberGenerator.h
+++ b/direct/src/dcparser/primeNumberGenerator.h
@@ -20,8 +20,16 @@
 #define PRIMENUMBERGENERATOR_H
 
 #include "dcbase.h"
+
+#ifdef WITHIN_PANDA
+// We only have the vector_int header file if we're compiling this
+// package within the normal Panda environment.
 #include "vector_int.h"
 
+#else
+typedef vector<int> vector_int;
+#endif
+
 ////////////////////////////////////////////////////////////////////
 //       Class : PrimeNumberGenerator
 // Description : This class generates a table of prime numbers, up to