diff --git a/src/cmd/postscript/common/ext.h b/src/cmd/postscript/common/ext.h
index e260cee..c0f7c7a 100644
--- a/src/cmd/postscript/common/ext.h
+++ b/src/cmd/postscript/common/ext.h
@@ -28,8 +28,12 @@
 extern int	optind;
 
 extern void	interrupt();
-//extern char	*tempnam(char*,char*);
+extern void	error();
+extern int	cat();
+extern void	concat();
+
 /* 
+ * extern char	*tempnam(char*,char*);
  * extern char	*malloc();
  * extern char	*calloc();
  * extern char	*strtok();