use CPPFLAGS if set

CPPFLAGS is a traditional build environment variable used to set C
pre-processor flags.  Accept these flags during the build if they've
been set.

diff --git a/config.mk b/config.mk
index be798d396b3667d1baec08623612c1dcfb592901..5a09a86668f61495ba7d1b15976f10f8c329d820 100644 (file)
--- a/config.mk
+++ b/config.mk
@@ -34,7 +34,7 @@ INSTALL := install
 
 # Flags
 BUILD_LDFLAGS += $(LDFLAGS)
-BUILD_CFLAGS := $(CFLAGS) -std=c99 -D_GNU_SOURCE
+BUILD_CFLAGS := $(CFLAGS) $(CPPFLAGS) -std=c99 -D_GNU_SOURCE
 BUILD_CFLAGS += -Wno-unused -Wtype-limits -Wformat -Wformat-security -Wall
 BUILD_CFLAGS += -I$(abspath .) -I$(abspath lib/generic) -I$(abspath contrib)
 BUILD_CFLAGS += -DPACKAGE_VERSION="\"$(VERSION)\"" -DPREFIX="\"$(PREFIX)\"" -DMODULEDIR="\"$(MODULEDIR)\""