xbps-src: added a waf build helper.

xbps-src/helpers/waf.sh

@@ -0,0 +1,26 @@
+#
+# This helper is for templates using WAF to build/install.
+#
+do_configure() {
+	if [ -z "$configure_script" ]; then
+		configure_script="./waf"
+	fi
+	${configure_script} configure --prefix=/usr ${configure_args}
+}
+
+do_build() {
+	if [ -z "$make_cmd" ]; then
+		make_cmd="./waf"
+	fi
+	${make_cmd} build ${make_build_args}
+}
+
+do_install() {
+	if [ -z "$make_cmd" ]; then
+		make_cmd="./waf"
+	fi
+	if [ -z "$make_install_args" ]; then
+		make_install_args="--destdir=$DESTDIR"
+	fi
+	${make_cmd} install ${make_install_args}
+}