orc: cross build support.

srcpkgs/orc/template

@@ -1,7 +1,7 @@
 # Template build file for 'orc'.
 pkgname=orc
 version=0.4.16
-revision=2
+revision=3
 build_style=gnu-configure
 configure_args="--disable-static"
 hostmakedepends="pkg-config"
@@ -17,13 +17,21 @@ long_desc="
  language that represents many of the features available in SIMD architectures,
  including saturated addition and subtraction, and many arithmetic operations."
 
+if [ "$CROSS_BUILD" ]; then
+	hostmakedepends+=" automake libtool"
+	pre_configure() {
+		sed -e 's,AM_CONFIG_HEADER,AC_CONFIG_HEADERS,g' -i configure.ac
+		autoreconf -fi
+	}
+fi
+
 post_install() {
 	vinstall COPYING 644 usr/share/licenses/orc
 }
 
 orc-devel_package() {
 	depends="orc>=${version}"
-	short_desc="${short_desc} - development files"
+	short_desc+=" - development files"
 	pkg_install() {
 		vmove usr/include
 		vmove usr/lib/pkgconfig