https://bugs.gentoo.org/726054
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -64,7 +64,6 @@ VERSION = @VERSION@
 
 bin_PROGRAMS = watchpid
 watchpid_SOURCES = watchpid.c
-CFLAGS = -Wall -Werror -O3
 man_MANS = watchpid.1
 EXTRA_DIST = $(man_MANS)
 mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs