indent: fix cross build

srcpkgs/indent/template

@@ -17,9 +17,10 @@ pre_configure() {
 
 post_build() {
 	# manpages are not created properly, so recreate it
+	unset CC LD AR AS RANLIB CPP CFLAGS CPPFLAGS LDFLAGS
 	cd man
 	rm indent.1
-	make CC=cc clean all
+	make CC=cc LD=cc CFLAGS= LDFLAGS= clean all
 }
 
 post_install() {