如何根据makefile找到libgtk在哪里？

 CROSS              := arm-linux-
export CC           := $(CROSS)gcc
export CXX          := $(CROSS)g++
export AR           := $(CROSS)ar

INSTALL_PATH        := $(PWD)/Distribution/

export CFLAGS := -Wall              \
    -DG_DISABLE_DEPRECATED      \
    -DGDK_DISABLE_DEPRECATED    \
    -DGDK_PIXBUF_DISABLE_DEPRECATED \
    -U__KERNEL__ -UDEBUG    
export CXXFLAGS := $(CFLAGS)

export SHELL:=/bin/sh
export MAKE:=make

MAKE_HOME_DIR=$(PWD)
SUB_LIB=lib
SUB_DIS=Distribution
SUB_RLS=release
SUB_LOCALE=bin/locale

export MAKE_DIR:=$(MAKE_HOME_DIR)
export BIN_DIR:=$(MAKE_HOME_DIR)/bin
export INC_DIR:=$(MAKE_HOME_DIR)/inc
export LIB_DIR:=$(MAKE_HOME_DIR)/$(SUB_LIB)
export SRC_DIR:=$(MAKE_HOME_DIR)/src
export DEP_DIR:=$(MAKE_HOME_DIR)/dep
export OBJ_DIR:=$(MAKE_HOME_DIR)/obj
export DB_DIR:=$(MAKE_HOME_DIR)/db
export RLS_DIR:=$(MAKE_HOME_DIR)/$(SUB_RLS)
export DIS_DIR:=$(MAKE_HOME_DIR)/$(SUB_DIS)
export LOCALE_DIR:=$(MAKE_HOME_DIR)/$(SUB_LOCALE)


export INC_PATH=-I. -I$(INC_DIR) `pkg-config --cflags gtk+-2.0`
export LIB_PATH=-L$(LIB_DIR) `pkg-config --libs gtk+-2.0`

...
还是根本就不是这个makefile，我找错了？