Merge pull request #28 from ZeroChaos-/patch-1

allow override of cc and cflags/ldflags

Makefile

@@ -1,4 +1,4 @@
-CC              = gcc
+CC             ?= gcc
 
 VERSION         = $(shell git describe --tags --abbrev=0)
 GITCOUNT        = $(shell git rev-list HEAD --count)
@@ -6,10 +6,11 @@ UNAME           = $(shell uname)
 
 OBJS            = main.o util.o radio.o dfu-libusb.o uv380.o md380.o rd5r.o \
                   gd77.o hid.o serial.o d868uv.o dm1801.o
-LDFLAGS         = -g
-LIBS            = $(shell pkg-config --libs --static libusb-1.0)
-CFLAGS          = -g -O -Wall -Werror -DVERSION='"$(VERSION).$(GITCOUNT)"' \
+CFLAGS         ?= -g -O -Wall -Werror 
+CFLAGS         += -DVERSION='"$(VERSION).$(GITCOUNT)"' \
                   $(shell pkg-config --cflags libusb-1.0)
+LDFLAGS        ?= -g
+LIBS            = $(shell pkg-config --libs --static libusb-1.0)
 
 #
 # Make sure pkg-config is installed.