-AM_CFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include -I$(top_srcdir)/src -I$(top_srcdir)/tests/common -g
+AM_CFLAGS += -I$(top_srcdir)/include -I$(top_builddir)/include -I$(top_srcdir)/src -I$(top_srcdir)/tests/common -g
SCRIPT_LIST = common.sh \
run.sh \