Mine

include $(TOPDIR)/rules.mk

PKG_NAME:=wpa_supplicant
PKG_VERSION:=0.5.4
PKG_RELEASE:=8
PKG_MD5SUM:=eaf78fa5dde04ee20e718a8e94eed827
PKG_BUILDDEP:=madwifi

PKG_SOURCE_URL:=http://hostap.epitest.fi/releases/
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_CAT:=zcat

PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
PKG_INSTALL_DIR:=$(PKG_BUILD_DIR)/ipkg-install

include $(INCLUDE_DIR)/package.mk

define Package/wpa_supplicant
SECTION:=net
CATEGORY:=Network
DEPENDS:=+libopenssl
TITLE:=IEEE 802.1x Supplicent
DESCRIPTION:=IEEE 802.1x/WPA/EAP/RADIUS Supplicant
URL:=http://hostap.epitest.fi/
endef

define Package/wpa_supplicant/conffiles
/etc/wpa_supplicant.conf
endef

define Build/Prepare
$(CP) ./files/config $(PKG_BUILD_DIR)/.config
touch $@
endef

define Build/Compile
        $(MAKE) -C $(PKG_BUILD_DIR) \
                $(TARGET_CONFIGURE_OPTS) \
                OPTFLAGS="$(TARGET_CFLAGS)" \
                CPPFLAGS="-I$(STAGING_DIR)/usr/include -I$(STAGING_DIR)/include -I$(STAGING_DIR)/usr/include/madwifi" \
                LDFLAGS="-L$(STAGING_DIR)/usr/lib -L$(STAGING_DIR)/lib" \
        all

define Package/wpa_supplicant/install
        install -d -m0755 $(1)/usr/sbin
endef
$(eval $(call BuildPackage,wpa_supplicant))