xbps: add main repo for musl.

srcpkgs/xbps/template

@@ -1,7 +1,7 @@
 # Template file for 'xbps'
 pkgname=xbps
 version=0.44.1
-revision=3
+revision=4
 bootstrap=yes
 build_style=configure
 short_desc="The XBPS package system utilities"
@@ -33,6 +33,14 @@ do_configure() {
 	HAVE_VASPRINTF=1 ./configure --prefix=/usr --sysconfdir=/etc --enable-debug \
 		${CHROOT_READY:+--enable-tests}
 }
+post_install() {
+	case "$XBPS_TARGET_MACHINE" in
+	*-musl) # XXX different repo location
+		echo "repository=http://musl.voidlinux.net/current" > \
+			${DESTDIR}/usr/share/xbps.d/00-repository-main.conf
+		;;
+	esac
+}
 
 libxbps_package() {
 	short_desc+=" - runtime library"