lv2core: add bit from arch to simulate running lv2config during pkg build

srcpkgs/lv2core/template

@@ -1,7 +1,7 @@
 # Template file for 'lv2core'
 pkgname=lv2core
 version=4.0
-revision=1
+revision=2
 build_style=waf
 homepage="http://lv2plug.in"
 distfiles="http://lv2plug.in/spec/lv2core-4.0.tar.bz2"
@@ -18,7 +18,14 @@ Add_dependency build python
 
 post_install()
 {
-	# Copy header to directory where other programs need to find it
-	vmkdir usr/include/lv2/lv2plug.in/ns/lv2core
-	vcopy lv2.h usr/include/lv2/lv2plug.in/ns/lv2core
+	# This bit is from Arch
+	# do the work of lv2config to own symlinks;
+	#   - generate lv2 headers
+	#   - see FS#23514
+	local _ns=$(grep '^<http' manifest.ttl | sed 's|<http://\(.*\)>|\1|')
+	local _name=${_ns/*\/}
+	local _path="usr/include/lv2/${_ns%/*}"
+	vmkdir "$_path"
+	cd "${DESTDIR}/usr/include/lv2/${_ns%/*}" && \
+		ln -s "../../../../lib/lv2/$_name.lv2" "$_name"
 }