?= just checks to see if a variable is not yet defined. If MENUSELECT_CFLAGS

was not found in the user level makeopts file, the variable is defined, but
empty.

I wish we could just require GNU make 3.81  :)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@36229 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -134,7 +134,9 @@ OTHER_SUBDIR_CFLAGS=-I../include -I..
 
 ifeq ($(origin MENUSELECT_CFLAGS),undefined)
   MENUSELECT_CFLAGS:=$(shell grep MENUSELECT_CFLAGS $(USER_MAKEOPTS) .)
-  MENUSELECT_CFLAGS?=$(shell grep MENUSELECT_CFLAGS $(GLOBAL_MAKEOPTS) .)
+  ifeq ($(MENUSELECT_CFLAGS),)
+    MENUSELECT_CFLAGS:=$(shell grep MENUSELECT_CFLAGS $(GLOBAL_MAKEOPTS) .)
+  endif
   ifneq ($(MENUSELECT_CFLAGS),)
     MENUSELECT_CFLAGS:=$(shell echo $(MENUSELECT_CFLAGS) | cut -f2 -d'=')
   endif