--- a/src/Makefile.in	Wed May 31 12:32:22 2017 +0200
+++ b/src/Makefile.in	Wed May 31 12:51:24 2017 +0200
@@ -260,8 +260,8 @@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-@DEBUG_FALSE@AM_CFLAGS = -std=gnu99 -O2
-@DEBUG_TRUE@AM_CFLAGS = -std=gnu99 -O0 -Wall
+@DEBUG_FALSE@AM_CFLAGS = -O2
+@DEBUG_TRUE@AM_CFLAGS = -g -O0 -Wall
 cline_SOURCES = arguments.c bfile_heuristics.c cline.c regex_parser.c \
 		scanner.c settings.c string_list.c suffix_fnc.c