From 9f8387710f92c2873df645283b2ecdfa1d92ff69 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 17 Nov 2004 19:31:02 +0000
Subject: [PATCH] Changed the dependencies file to use ?= instead of = to allow
 env vars to override local settings.

---
 Make/dependencies | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/Make/dependencies b/Make/dependencies
index 772634a8e..0b6c9441c 100644
--- a/Make/dependencies
+++ b/Make/dependencies
@@ -1,39 +1,39 @@
 ################################################################
 # Dependency library which have been installed on this system
 
-GDAL_INSTALLED = no
-JASPER_INSTALLED = no
+GDAL_INSTALLED ?= no
+JASPER_INSTALLED ?= no
 
-FREETYPE_INSTALLED = yes
+FREETYPE_INSTALLED ?= yes
 
 ifeq ($(OS),Darwin)
-    DARWIN_QUICKTIME  = yes
+    DARWIN_QUICKTIME ?= yes
 endif
 
 ifeq ($(DARWIN_QUICKTIME),yes)
 
-    QUICKTIME_INSTALLED = yes
-    LIBJPEG_INSTALLED = no
-    LIBUNGIF_INSTALLED = no
-    LIBTIFF_INSTALLED = no
-    LIBPNG_INSTALLED = no
-    LIBMPEG3_INSTALLED = no
+    QUICKTIME_INSTALLED ?= yes
+    LIBJPEG_INSTALLED ?= no
+    LIBUNGIF_INSTALLED ?= no
+    LIBTIFF_INSTALLED ?= no
+    LIBPNG_INSTALLED ?= no
+    LIBMPEG3_INSTALLED ?= no
 
 else
 
-    QUICKTIME_INSTALLED = no
-    LIBJPEG_INSTALLED = yes
-    LIBUNGIF_INSTALLED = yes
-    LIBTIFF_INSTALLED = yes
-    LIBPNG_INSTALLED = yes
-    LIBMPEG3_INSTALLED = no
+    QUICKTIME_INSTALLED ?= no
+    LIBJPEG_INSTALLED ?= yes
+    LIBUNGIF_INSTALLED ?= yes
+    LIBTIFF_INSTALLED ?= yes
+    LIBPNG_INSTALLED ?= yes
+    LIBMPEG3_INSTALLED ?= no
 
 endif
 
 
-COIN_INSTALLED = no
-INVENTOR_INSTALLED = no
+COIN_INSTALLED ?= no
+INVENTOR_INSTALLED ?= no
 
-PERFORMER_INSTALLED = no
+PERFORMER_INSTALLED ?= no
 
-DEMETER_INSTALLED = no
+DEMETER_INSTALLED ?= no