hans: simplified build style

srcpkgs/hans/template

@@ -1,8 +1,7 @@
 # Template file for 'hans'
 pkgname=hans
 version=0.4.4
-revision=1
-build_style=gnu-makefile
+revision=2
 short_desc="ICMP tunneling software"
 maintainer="Andrea Brancaleoni <miwaxe@gmail.com>"
 license="GPL-3"
@@ -10,9 +9,8 @@ homepage="http://code.gerade.org/hans/"
 distfiles="https://github.com/friedrich/$pkgname/archive/v$version.tar.gz"
 checksum=68fd2497e2e0219ee17a6ee06a85efbae0139b3ba068bb4b9aa65c6ab7629d37
 
-pre_build() {
-	sed -i 's|GCC|CC|g' Makefile
-	sed -i 's|GPP|CXX|g' Makefile
+do_build() {
+	make GCC="$CC" GPP="$CXX"
 }
 
 do_install() {