-PKG_SOURCE_URL:=http://www.mpfr.org/mpfr-$(PKG_VERSION)
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
-PKG_MD5SUM:=f45bac3584922c8004a10060ab1a8f9f
+PKG_SOURCE_URL:=http://www.mpfr.org/mpfr-$(PKG_VERSION) \
+ @GNU/mpfr
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_HASH:=015fde82b3979fbe5f83501986d328331ba8ddf008c1ff3da3c238f49ca062bc