--- /usr/portage/net-wireless/hostapd/hostapd-2.0.ebuild	2013-04-29 21:01:25.000000000 +0200
+++ hostapd-2.0.ebuild	2013-06-12 19:22:00.000000000 +0200
@@ -4,7 +4,7 @@
 
 EAPI="4"
 
-inherit toolchain-funcs eutils
+inherit toolchain-funcs eutils savedconfig flag-o-matic
 
 DESCRIPTION="IEEE 802.11 wireless LAN Host AP daemon"
 HOMEPAGE="http://hostap.epitest.fi"
@@ -35,91 +35,96 @@
 		"${S}/hostapd.conf" || die
 }
 
+hostapd_config_option() {
+	local key="$1"   ; shift
+	local val="$@"
+
+	if ! grep -qE "^(#| )*CONFIG_${key}[ =]" "${CONFIG}" ; then
+		eqawarn "CONFIG_${key} is missing in defconfig"
+		echo >> "${CONFIG}"
+		echo "# .config imported from ${S}/defconfig is missing CONFIG_${key}" >> "${CONFIG}"
+		echo "# CONFIG_${key} is not set" >> "${CONFIG}"
+	fi
+
+	if [[ ${val} == "n" ]] ; then
+		sed -i -re "s:^(#| )*CONFIG_${key}[ =].*:# CONFIG_${key} is not set:" "${CONFIG}"
+	else
+		sed -i -re "s:^(#| )*CONFIG_${key}[ =].*:CONFIG_${key}=${val}:" "${CONFIG}"
+	fi
+
+	einfo $(grep -E "^(#| )*CONFIG_${key}[ =]" "${CONFIG}")
+}
+
 src_configure() {
-	local CONFIG="${S}/.config"
+	tc-export CC
 
-	# toolchain setup
-	echo "CC = $(tc-getCC)" > ${CONFIG}
+	#append-libs -L/usr/lib
+	# Add include path for madwifi-driver headers
+	use madwifi && append-cflags -I/usr/include/madwifi
 
-	# EAP authentication methods
-	echo "CONFIG_EAP=y" >> ${CONFIG}
-	echo "CONFIG_EAP_MD5=y" >> ${CONFIG}
+	CONFIG="${S}/.config"
+	restore_config "${CONFIG}"
 
-	if use ssl; then
-		# SSL authentication methods
-		echo "CONFIG_EAP_TLS=y" >> ${CONFIG}
-		echo "CONFIG_EAP_TTLS=y" >> ${CONFIG}
-		echo "CONFIG_EAP_MSCHAPV2=y" >> ${CONFIG}
-		echo "CONFIG_EAP_PEAP=y" >> ${CONFIG}
-	fi
+	[[ -f "${CONFIG}" ]] && return 0
 
-	if use wps; then
-		# Enable Wi-Fi Protected Setup
-		echo "CONFIG_WPS=y" >> ${CONFIG}
-		echo "CONFIG_WPS2=y" >> ${CONFIG}
-		echo "CONFIG_WPS_UPNP=y" >> ${CONFIG}
-		einfo "Enabling Wi-Fi Protected Setup support"
-	fi
+	einfo "Generating configuration based on defconfig"
+	cp "${S}/defconfig" "${CONFIG}"
 
-	echo "CONFIG_EAP_GTC=y" >> ${CONFIG}
-	echo "CONFIG_EAP_SIM=y" >> ${CONFIG}
-	echo "CONFIG_EAP_AKA=y" >> ${CONFIG}
-	echo "CONFIG_EAP_PAX=y" >> ${CONFIG}
-	echo "CONFIG_EAP_PSK=y" >> ${CONFIG}
-	echo "CONFIG_EAP_SAKE=y" >> ${CONFIG}
-	echo "CONFIG_EAP_GPSK=y" >> ${CONFIG}
-	echo "CONFIG_EAP_GPSK_SHA256=y" >> ${CONFIG}
+	# EAP authentication methods
+	hostapd_config_option EAP y
+	hostapd_config_option EAP_MD5 y
 
-	einfo "Enabling drivers: "
+	# SSL authentication methods
+	hostapd_config_option EAP_TLS $(usex ssl y n)
+	hostapd_config_option EAP_TTLS $(usex ssl y n)
+	hostapd_config_option EAP_MSCHAPV2 $(usex ssl y n)
+	hostapd_config_option EAP_PEAP $(usex ssl y n)
+
+	# Enable Wi-Fi Protected Setup
+	hostapd_config_option WPS $(usex wps y n)
+	hostapd_config_option WPS2 $(usex wps y n)
+	hostapd_config_option WPS_UPNP $(usex wps y n)
+
+	hostapd_config_option EAP_GTC y
+	hostapd_config_option EAP_SIM y
+	hostapd_config_option EAP_AKA y
+	hostapd_config_option EAP_PAX y
+	hostapd_config_option EAP_PSK y
+	hostapd_config_option EAP_SAKE y
+	hostapd_config_option EAP_GPSK y
+	hostapd_config_option EAP_GPSK_SHA256 y
 
 	# drivers
-	echo "CONFIG_DRIVER_HOSTAP=y" >> ${CONFIG}
-	einfo "  HostAP driver enabled"
-	echo "CONFIG_DRIVER_WIRED=y" >> ${CONFIG}
-	einfo "  Wired driver enabled"
-	echo "CONFIG_DRIVER_PRISM54=y" >> ${CONFIG}
-	einfo "  Prism54 driver enabled"
-	echo "CONFIG_DRIVER_NONE=y" >> ${CONFIG}
-	einfo "  None driver enabled"
-
-	if use madwifi; then
-		# Add include path for madwifi-driver headers
-		einfo "  Madwifi driver enabled"
-		echo "CFLAGS += -I/usr/include/madwifi" >> ${CONFIG}
-		echo "CONFIG_DRIVER_MADWIFI=y" >> ${CONFIG}
-	else
-		einfo "  Madwifi driver disabled"
-	fi
-
-	einfo "  nl80211 driver enabled"
-	echo "CONFIG_DRIVER_NL80211=y" >> ${CONFIG}
-	echo "LIBS += -L/usr/lib" >> ${CONFIG}
+	# TODO: Add support for BSD drivers
+	hostapd_config_option DRIVER_HOSTAP y
+	hostapd_config_option DRIVER_WIRED y
+	hostapd_config_option DRIVER_NONE y
+	hostapd_config_option DRIVER_MADWIFI $(usex madwifi y n)
+	hostapd_config_option DRIVER_NL80211 y
 
 	# misc
-	echo "CONFIG_PKCS12=y" >> ${CONFIG}
-	echo "CONFIG_RADIUS_SERVER=y" >> ${CONFIG}
-	echo "CONFIG_IAPP=y" >> ${CONFIG}
-	echo "CONFIG_IEEE80211R=y" >> ${CONFIG}
-	echo "CONFIG_IEEE80211W=y" >> ${CONFIG}
-	echo "CONFIG_IEEE80211N=y" >> ${CONFIG}
-	echo "CONFIG_PEERKEY=y" >> ${CONFIG}
-	echo "CONFIG_RSN_PREAUTH=y" >> ${CONFIG}
-	echo "CONFIG_INTERWORKING=y" >> ${CONFIG}
-
-	if use ipv6; then
-		# IPv6 support
-		echo "CONFIG_IPV6=y" >> ${CONFIG}
-	fi
+	hostapd_config_option PKCS12 y
+	hostapd_config_option RADIUS_SERVER y
+	hostapd_config_option IAPP y
+	hostapd_config_option IEEE80211R y
+	hostapd_config_option IEEE80211W y
+	hostapd_config_option IEEE80211N y
+	hostapd_config_option PEERKEY y
+	hostapd_config_option RSN_PREAUTH y
+	hostapd_config_option INTERWORKING y
+
+	# IPv6 support
+	hostapd_config_option IPV6 $(usex ipv6 y n)
 
 	# If we are using libnl 2.0 and above, enable support for it
 	# Removed for now, since the 3.2 version is broken, and we don't
 	# support it.
 	if has_version ">=dev-libs/libnl-3.2"; then
-		echo "CONFIG_LIBNL32=y" >> .config
+		hostapd_config_option LIBNL32 y
+	else
+		hostapd_config_option LIBNL32 n
 	fi
 
-	# TODO: Add support for BSD drivers
-
 	default_src_configure
 }
 
@@ -133,6 +138,8 @@
 }
 
 src_install() {
+	save_config "${CONFIG}"
+
 	insinto /etc/${PN}
 	doins ${PN}.{conf,accept,deny,eap_user,radius_clients,sim_db,wpa_psk}