Added imgpng
diff --git a/Mac/Modules/config.c b/Mac/Modules/config.c
index 8dc8b8a..c43dc8a 100644
--- a/Mac/Modules/config.c
+++ b/Mac/Modules/config.c
@@ -121,6 +121,7 @@
 extern void initimgpgm();
 extern void initimgtiff();
 extern void initimgsgi();
+extern void initimgpng();
 extern void initimgop();
 #endif
 #ifdef USE_TK
@@ -214,6 +215,7 @@
 	{"imgpgm",	initimgpgm},
 	{"imgtiff",	initimgtiff},
 	{"imgsgi",	initimgsgi},
+	{"imgpng",	initimgpng},
 	{"imgop",	initimgop},
 #endif
 #ifdef USE_TK