Makefile improvement

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>

Author: msva

Makefile

@@ -8,11 +8,9 @@ PKG_CONFIG       ?= pkg-config
 INSTALL          ?= install
 RM               ?= rm
 LUA_IMPL         ?= lua
-LUA_BIN          ?= $(LUA_IMPL)
 CC               ?= $(MAC_ENV) gcc
 
-
-LUA_VERSION       = $(shell $(PKG_CONFIG) --print-provides $(LUA_IMPL) 2>/dev/null)
+LUA_VERSION       = $(shell $(PKG_CONFIG) --print-provides --silence-errors $(LUA_IMPL))
 ifeq ($(LUA_VERSION),)
 LUA_CMOD         ?= /usr/lib/lua/5.1
 LUA_LMOD         ?= /usr/share/lua/5.1
@@ -59,8 +57,6 @@ SRCS              = src/*.c
 
 BIN               = $(T).so
 
-
-
 all: $(BIN)
 
 $(BIN): $(SRCS)
@@ -75,4 +71,4 @@ install: all
 	$(INSTALL) src/lua/cURL/impl/cURL.lua $(DESTDIR)$(LUA_LMOD)/cURL/impl
 
 clean:
-	rm -f $(BIN)
+	$(RM) -f $(BIN)