libotr3: cross build support.

srcpkgs/libotr3/template

@@ -1,7 +1,7 @@
 # Template build file for 'libotr3'.
 pkgname=libotr3
 version=3.2.1
-revision=2
+revision=3
 wrksrc="libotr-${version}"
 build_style=gnu-configure
 configure_args="--program-transform-name='s/otr/otr3/'"
@@ -13,6 +13,10 @@ license="GPL-2, LGPL-2.1"
 distfiles="http://www.cypherpunks.ca/otr/libotr-${version}.tar.gz"
 checksum=d428eaa584984baa09450cca07742e0ac8fc62401f3a1c556e3025023369cdf4
 
+pre_build() {
+	sed '/INCLUDES/s,-I$(includedir),,' -i toolkit/Makefile
+}
+
 post_install() {
 	for i in parse sesskeys mackey readforge modify remac; do
 		rm ${DESTDIR}/usr/share/man/man1/otr_${i}.1