$(RM_F) *.o libpng.a pngtest pngout.png libpng-config \
libpng.pc $(LIBNAME).*dylib pngtesti pnglibconf.h
-DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*