Debian-specific.

--- gnustep-make-2.4.0.orig/common.make
+++ gnustep-make-2.4.0/common.make
@@ -414,6 +414,9 @@
 
 # First, we add paths based in the USER domain.
 
+# Don't add GNUSTEP_USER_ROOT paths if being built by dpkg-buildpackage
+ifndef DEB_BUILD_ARCH
+
 # Please note that the following causes GS_HEADER_PATH to be evaluated
 # with the variable domain equal to USER, which gives the effect we
 # wanted.
@@ -421,6 +424,8 @@
 GNUSTEP_LIBRARIES_DIRS = $(foreach domain,USER,$(GS_LIBRARY_PATH))
 GNUSTEP_FRAMEWORKS_DIRS = $(foreach domain,USER,$(GS_FRAMEWORK_PATH))
 
+endif
+
 # Second, if LOCAL flags are different from USER flags (which have
 # already been added), we add the LOCAL flags too.
 ifneq ($(GNUSTEP_LOCAL_HEADERS), $(GNUSTEP_USER_HEADERS))