diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 4201201..c84b6ce 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -22,6 +22,8 @@
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
 
+# for pgcc version 2.95.1, -O3 is buggy; don't us it.
+
 CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops \
 	$(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
@@ -32,7 +34,7 @@
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.4
+PNGMIN = 1.0.4c
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include