Index: Makefile.in
--- Makefile.in.orig
+++ Makefile.in
@@ -498,7 +498,7 @@ target_alias = @target_alias@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-AM_CFLAGS = -O -Wall
+AM_CFLAGS = -Wall
 EXTRA_DIST = $(TESTS) $(TESTS:.res=) test/test \
 	build-aux/git-version-gen
 pgpdump_SOURCES = \
