txr: fix crossbuild

srcpkgs/txr/template

@@ -12,10 +12,17 @@ distfiles="http://www.kylheku.com/cgit/txr/snapshot/${pkgname}-${version}.tar.bz
 checksum=e26b2c6c8065711b82c03f84e0813e04dcb58d0e5cef6279dc34128c267025d3
 make_check_target=tests
 
+if [ "$CROSS_BUILD" ]; then
+	hostmakedepends+=" txr"
+fi
+
 do_configure() {
 	./configure --prefix=/usr --ccname="${CC}" \
 		--platform-cflags="${CFLAGS}" \
 		--platform-ldflags="${LDFLAGS}"
+	if [ "$CROSS_BUILD" ]; then
+		sed -i 's#^TXR :=.*#TXR = /usr/bin/txr#' Makefile
+	fi
 }
 
 pre_check() {