protobuf: cross build support.

srcpkgs/protobuf/template

@@ -1,9 +1,9 @@
 # Template file for 'protobuf'
 pkgname=protobuf
 version=2.5.0
-revision=2
+revision=3
 build_style=gnu-configure
-hostmakedepends="pkg-config"
+hostmakedepends="libtool pkg-config"
 makedepends="zlib-devel"
 short_desc="Google's data interchange format"
 maintainer="davehome <davehome@redthumb.info.tm>"
@@ -12,6 +12,16 @@ homepage="http://code.google.com/p/${pkgname}/"
 license="BSD"
 checksum=13bfc5ae543cf3aa180ac2485c0bc89495e3ae711fc6fab4f8ffe90dfb4bb677
 
+if [ "$CROSS_BUILD" ]; then
+	# needs host protoc
+	hostmakedepends+=" protobuf"
+	configure_args+=" --with-protoc=/usr/bin/protoc"
+fi
+
+pre_configure() {
+	libtoolize -f
+}
+
 protobuf-devel_package() {
 	depends="zlib-devel protobuf>=${version}_${revision} protobuf-lite>=${version}_${revision}"
 	short_desc="Google's data interchange format  - development files"