diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index c85d01e..0ea7d3e 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -34,7 +34,7 @@
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.5d
+PNGMIN = 1.0.5h
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include
@@ -86,6 +86,10 @@
 clean:
 	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
 
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
 png.o png.pic.o: png.h pngconf.h