diff --git a/functions.sh.in b/functions.sh.in
index 898381e..784be0f 100644
--- a/functions.sh.in
+++ b/functions.sh.in
@@ -77,7 +77,7 @@ readconfig() {
 	[ -n "${SRCDEST+x}" ] && _SRCDEST=$SRCDEST
 	[ -n "${CC+x}" ] && _CC=$CC
 	[ -n "${CXX+x}" ] && _CXX=$CXX
-	[ -n "${LD+x}" ] && _LD=$LD	
+	[ -n "${LD+x}" ] && _LD=$LD
 	[ -n "${CARCH+x}" ] && _CARCH=$CARCH
 	[ -n "${CHOST+x}" ] && _CHOST=$CHOST
 	[ -n "${CTARGET+x}" ] && _CTARGET=$CTARGET
@@ -96,9 +96,11 @@ readconfig() {
 	[ -n "${PACKAGER+x}" ] && _PACKAGER=$PACKAGER
 	[ -n "${USE_COLORS+x}" ] && _USE_COLORS="$USE_COLORS"
 	[ -n "${USE_CCACHE+x}" ] && _USE_CCACHE="$USE_CCACHE"
+	: ${ABUILD_DEFCONF:=$ABUILD_SHAREDIR/default.conf}
 	: ${ABUILD_CONF:=$sysconfdir/abuild.conf}
 	: ${ABUILD_USERDIR:=$HOME/.abuild}
 	: ${ABUILD_USERCONF:=$ABUILD_USERDIR/abuild.conf}
+	[ -f "$ABUILD_DEFCONF" ] && . "$ABUILD_DEFCONF"
 	[ -f "$ABUILD_CONF" ] && . "$ABUILD_CONF"
 	[ -f "$ABUILD_USERCONF" ] && . "$ABUILD_USERCONF"
 	APORTSDIR=${_APORTSDIR-$APORTSDIR}
diff --git a/tests/functions_test b/tests/functions_test
index 06cba40..b7928de 100755
--- a/tests/functions_test
+++ b/tests/functions_test
@@ -56,22 +56,29 @@ funcs_check_env_set_but_empty_body() {
 }
 
 funcs_check_defconfig_body() {
+	echo "CFLAGS=defcflags" > def.conf
 	echo "CFLAGS=syscflags" > etc.conf
 	echo "CFLAGS=usercflags" > user.conf
 
+	# test /usr/share/abuild/default.conf
+	ABUILD_DEFCONF="$PWD"/def.conf ABUILD_CONF=/dev/null ABUILD_USERCONF=/dev/null \
+		atf_check -o match:"defcflags" \
+		sh -e -c " . $FUNCS; echo \"\$CFLAGS\""
+
 	# test /etc/abuild.conf
-	ABUILD_CONF="$PWD"/etc.conf atf_check \
+	ABUILD_DEFCONF=/dev/null ABUILD_CONF="$PWD"/etc.conf ABUILD_USERCONF=/dev/null \
+		atf_check \
 		-o match:"syscflags" \
 		sh -e -c " . $FUNCS; echo \"\$CFLAGS\""
 
 	# user config ($HOME/.abuild/abuild.conf) wins over /etc/abuild.conf
-	ABUILD_CONF="$PWD/etc.conf" ABUILD_USERCONF="$PWD/user.conf" \
+	ABUILD_DEFCONF="$PWD"/def.conf ABUILD_CONF="$PWD/etc.conf" ABUILD_USERCONF="$PWD/user.conf" \
 	atf_check \
 		-o match:"usercflags" \
 		sh -e -c " . $FUNCS; echo \"\$CFLAGS\""
 
 	# environment wins
-	ABUILD_CONF="$PWD/etc.conf" ABUILD_USERCONF="$PWD/user.conf" \
+	ABUILD_DEFCONF="$PWD"/def.conf ABUILD_CONF="$PWD/etc.conf" ABUILD_USERCONF="$PWD/user.conf" \
 		CFLAGS="envcflags" atf_check \
 		-o match:"envcflags" \
 		sh -e -c " . $FUNCS; echo \"\$CFLAGS\""