diff -NrU5 systemd-187.orig/Makefile.am systemd-187/Makefile.am
--- systemd-187.orig/Makefile.am	2012-08-08 15:27:24.480166593 +0200
+++ systemd-187/Makefile.am	2012-08-08 17:38:29.653104547 +0200
@@ -1024,11 +1024,11 @@
 BUILT_SOURCES += \
 	src/core/syscall-from-name.h \
 	src/core/syscall-to-name.h
 
 src/core/syscall-list.txt: Makefile
-	$(AM_V_GEN)cpp $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include sys/syscall.h < /dev/null | $(AWK) '/^#define[ \t]+__NR_[^ ]+[ \t]+[0-9]/ { sub(/__NR_/, "", $$2); print $$2; }' > $@
+	$(AM_V_GEN)$(CPP) $(CFLAGS) $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include sys/syscall.h - < /dev/null | $(AWK) '/^#define[ \t]+__NR_[^ ]+[ \t]+[0-9]/ { sub(/__NR_/, "", $$2); print $$2; }' > $@
 
 src/core/syscall-from-name.gperf: src/core/syscall-list.txt Makefile
 	$(AM_V_GEN)$(AWK) 'BEGIN{ print "struct syscall_name { const char* name; int id; };"; print "%null-strings"; print "%%";} { printf "%s, __NR_%s\n", $$1, $$1 }' < $< > $@
 
 src/core/syscall-from-name.h: src/core/syscall-from-name.gperf Makefile
@@ -3430,11 +3430,11 @@
 CLEANFILES += \
 	$(dist_man_MANS) \
 	${XML_FILES:.xml=.html}
 endif
 
-DBUS_PREPROCESS = $(CPP) -P $(DBUS_CFLAGS) -imacros dbus/dbus-protocol.h
+DBUS_PREPROCESS = $(CPP) -P $(CFLAGS) $(DBUS_CFLAGS) -imacros dbus/dbus-protocol.h
 
 CLEANFILES += \
 	$(dbusinterface_DATA)
 
 systemd-install-data-hook: