* Don't override environment variables in Makefile

diff --git a/build/gccconfig.mk b/build/gccconfig.mk
index 0e4de2795f6886769880d3c26f2b787e0b444ca6..77bcf3674464ec6e34114d67148a52bb3813872c 100644 (file)
--- a/build/gccconfig.mk
+++ b/build/gccconfig.mk
@@ -1,22 +1,22 @@
 OS ?= $(shell uname)
 
-LUA_SHLIBS = $(shell pkg-config --silence-errors --libs lua5.1)
-LUA_LIBS = $(if $(LUA_SHLIBS),$(LUA_SHLIBS),$(firstword $(wildcard /usr/lib/liblua.a /usr/local/lib/liblua.a /opt/local/lib/liblua.a)))
-LUA_CFLAGS = $(shell pkg-config --silence-errors --cflags lua5.1)
+LUA_SHLIBS ?= $(shell pkg-config --silence-errors --libs lua5.1)
+LUA_LIBS ?= $(if $(LUA_SHLIBS),$(LUA_SHLIBS),$(firstword $(wildcard /usr/lib/liblua.a /usr/local/lib/liblua.a /opt/local/lib/liblua.a)))
+LUA_CFLAGS ?= $(shell pkg-config --silence-errors --cflags lua5.1)
 
-CC = gcc
-AR = ar
-RANLIB = ranlib
-CFLAGS = -O2
-FPIC = -fPIC
-EXTRA_CFLAGS = --std=gnu99
-WFLAGS = -Wall -Werror -pedantic
-CPPFLAGS =
-COMPILE = $(CC) $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) $(WFLAGS)
+CC ?= gcc
+AR ?= ar
+RANLIB ?= ranlib
+CFLAGS ?= -O2
+FPIC ?= -fPIC
+EXTRA_CFLAGS ?= --std=gnu99
+WFLAGS ?= -Wall -Werror -pedantic
+CPPFLAGS ?=
+COMPILE ?= $(CC) $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) $(WFLAGS)
 ifeq ($(OS),Darwin)
-  SHLIB_FLAGS = -bundle -undefined dynamic_lookup
+  SHLIB_FLAGS ?= -bundle -undefined dynamic_lookup
 else
-  SHLIB_FLAGS = -shared
+  SHLIB_FLAGS ?= -shared
 endif
-LINK = $(CC)
+LINK ?= $(CC)