Merge pull request #37 from real-dam/cross-pkg-config

Improve cross-building by honoring PKG_CONFIG from environment

diff --cc Makefile
index 04ad2d547c5276c83d0b3f4acc023f5240e866bf,640d7cd73a99799eec3d4792748e691b48c620d4..daa4c5d8abff48319d172903df31443a18f19950
--- 1/Makefile
--- 2/Makefile
+++ b/Makefile
@@@ -1,6 -1,7 +1,7 @@@
  CC ?= gcc
+ PKG_CONFIG ?= pkg-config
  PREFIX ?= /usr/local
 -VERSION = $(shell git describe --always | tail -c +2)
 +VERSION := $(shell if [ -d .git ] && which git 2>&1 > /dev/null; then git describe --always | tail -c +2; else echo $$STANDALONE_VERSION; fi)
  LIBS = -lpcap
  CFLAGS += -Wall -g -DNMRPFLASH_VERSION=\"$(VERSION)\"
  LDFLAGS += $(LIBS)