From 50647e94dd944f35afb2460e6fd704b62a3e65bc Mon Sep 17 00:00:00 2001
From: Manuel Messner
Date: Thu, 8 Feb 2018 16:25:59 +0100
Subject: Makefile: simplify ifndef+def -> ?=

---
 Makefile | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 82993a4..e278c52 100644
--- a/Makefile
+++ b/Makefile
@@ -12,15 +12,11 @@ ifeq ($(shell which qemu-system-$(shell uname -m | sed 's/i686/i386/') 2>&1 > /d
 endif
 ifeq ($(shell which virtualbox 2>&1 > /dev/null && echo $$?), 0)
     AVAILABLE_BUILDERS += virtualbox-iso
-    ifndef DEFAULT_BUILDER
-        DEFAULT_BUILDER := virtualbox-iso
-    endif
+    DEFAULT_BUILDER    ?= virtualbox-iso
 endif
 ifeq ($(shell which vmplayer 2>&1 > /dev/null && echo $$?), 0)
     AVAILABLE_BUILDERS += vmware-iso
-    ifndef DEFAULT_BUILDER
-        DEFAULT_BUILDER := vmware-iso
-    endif
+    DEFAULT_BUILDER    ?= vmware-iso
 endif
 ifndef BUILDER
     $(info # BUILDER not set, using default builder: $(DEFAULT_BUILDER))
-- 
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