Imported from libpng-1.4.0beta13.tar
diff --git a/Makefile.am b/Makefile.am
index 32ab3b3..68ba660 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -134,7 +134,9 @@
 	cd $(DESTDIR)$(libdir);\
 	for ext in a la so; do\
 		rm -f libpng.$$ext;\
-		$(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
+                if test -f $(PNGLIB_BASENAME).$$ext; then\
+                       $(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
+                fi;\
 	done
 
 uninstall-hook: