Beat me. Whip me. Make me write MFC code. I got way too involved with a discussion about nspr breakage that I caused some myself. Need to set NSPR CFLAGS for xpidl.

config/rules.mk

@@ -80,8 +80,8 @@ endif
 ifdef INTERNAL_TOOLS
 CC=$(HOST_CC)
 CXX=$(HOST_CXX)
-CFLAGS=$(HOST_CFLAGS) -I$(DIST)/include
-CXXFLAGS=$(HOST_CXXFLAGS) -I$(DIST)/include
+CFLAGS=$(HOST_CFLAGS) -I$(DIST)/include $(NSPR_CFLAGS)
+CXXFLAGS=$(HOST_CXXFLAGS) -I$(DIST)/include $(NSPR_CFLAGS)
 RANLIB=$(HOST_RANLIB)
 endif