--- src/sparkey/Makefile.am.orig	Thu Feb  9 20:34:15 2017
+++ src/sparkey/Makefile.am	Mon Feb 13 13:41:01 2017
@@ -1,5 +1,5 @@
 CFLAGS_CONF = @CFLAGS@
-CFLAGS = -I/usr/local/include -O2 -Wall -Wextra -Wfloat-equal -Wshadow -Wpointer-arith -Werror -pedantic $(CFLAGS_CONF)
+CFLAGS = -I/usr/local/include -Wall -Wextra -Wfloat-equal -Wshadow -Wpointer-arith -Werror -pedantic -fgnu89-inline $(CFLAGS_CONF)
 
 noinst_LTLIBRARIES = libsparkey.la
 libsparkey_la_SOURCES = endiantools.h hashheader.h logheader.h \
