contrib: add gmp

contrib/src/gmp/SHA512SUMS

+b53cc482e73aa91ae4f83301d9ef83a98cd85cfe53347e102a059fa477edceebded466223b436bc250314eb6ec2e53ecc4fa1528341435f09e232f0c4e305bad  gmp-5.0.2.tar.bz2

contrib/src/gmp/rules.mak

+# GNU Multiple Precision Arithmetic
+
+GMP_VERSION := 5.0.2
+GMP_URL := ftp://ftp.gmplib.org/pub/gmp-$(GMP_VERSION)/gmp-$(GMP_VERSION).tar.bz2
+
+$(TARBALLS)/gmp-$(GMP_VERSION).tar.bz2:
+	$(call download,$(GMP_URL))
+
+.sum-gmp: gmp-$(GMP_VERSION).tar.bz2
+
+gmp: gmp-$(GMP_VERSION).tar.bz2 .sum-gmp
+	$(UNPACK)
+	$(MOVE)
+
+.gmp: gmp
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && $(MAKE) install
+	touch $@

contrib/src/nettle/rules.mak

@@ -14,6 +14,8 @@ nettle: nettle-$(NETTLE_VERSION).tar.gz .sum-nettle
 	$(UNPACK)
 	$(MOVE)
 
+DEPS_nettle = gmp $(DEPS_gmp)
+
 .nettle: nettle
 	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
 	cd $< && $(MAKE) install