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-rw-r--r--build-aux/Makefile.once.head/20-systemd.mk1
1 files changed, 1 insertions, 0 deletions
diff --git a/build-aux/Makefile.once.head/20-systemd.mk b/build-aux/Makefile.once.head/20-systemd.mk
index 5dcd4d2e54..eefed97d1e 100644
--- a/build-aux/Makefile.once.head/20-systemd.mk
+++ b/build-aux/Makefile.once.head/20-systemd.mk
@@ -23,6 +23,7 @@
OUR_CPPFLAGS += -MT $@ -MD -MP -MF $(@D)/$(DEPDIR)/$(basename $(@F)).P$(patsubst .%,%,$(suffix $(@F)))
OUR_CPPFLAGS += -include $(topoutdir)/config.h
+OUR_CPPFLAGS += $(if $(<D),-I$(<D)) -I$(@D)
at.dirlocal += AM_CFLAGS AM_CPPFLAGS AM_LDFLAGS AM_LIBTOOLFLAGS
ALL_CFLAGS = $(OUR_CFLAGS) $(AM_CFLAGS/$(@D)) $(CFLAGS)