From 0fc86e9632312e9083141066d98ec260f9bc62e3 Mon Sep 17 00:00:00 2001
From: Simon McVittie <smcv@debian.org>
Date: Sun, 15 Mar 2015 12:34:51 +0000
Subject: [PATCH] Use pkg-config for a system libjpeg if available:
 libjpeg-turbo has it

Bug: https://github.com/ioquake/ioq3/pull/116
---
 Makefile | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index d0d20077..b6796f60 100644
--- a/Makefile
+++ b/Makefile
@@ -1074,11 +1074,10 @@ ifeq ($(USE_INTERNAL_JPEG),1)
   BASE_CFLAGS += -DUSE_INTERNAL_JPEG
   BASE_CFLAGS += -I$(JPDIR)
 else
-  # libjpeg doesn't have pkg-config yet, but let users override with
-  # "make JPEG_CFLAGS=-I/opt/jpeg/include JPEG_LIBS='-L/opt/jpeg/lib -ljpeg'"
-  # if they need to
-  JPEG_CFLAGS ?=
-  JPEG_LIBS ?= -ljpeg
+  # IJG libjpeg doesn't have pkg-config, but libjpeg-turbo uses libjpeg.pc;
+  # we fall back to hard-coded answers if libjpeg.pc is unavailable
+  JPEG_CFLAGS ?= $(shell pkg-config --silence-errors --cflags libjpeg || true)
+  JPEG_LIBS ?= $(shell pkg-config --silence-errors --libs libjpeg || echo -ljpeg)
   BASE_CFLAGS += $(JPEG_CFLAGS)
   RENDERER_LIBS += $(JPEG_LIBS)
 endif