Radix cross Linux 3pp sources

diff --git a/GNU/gmp/Makefile b/GNU/gmp/Makefile
new file mode 100644
index 0000000..8fc0fe5
--- /dev/null
+++ b/GNU/gmp/Makefile
@@ -0,0 +1,42 @@
+#
+# Download: https://www.gnu.org/prep/ftp.html
+#
+# You can use the generic url http://ftpmirror.gnu.org 
+# to automatically choose a nearby and up-to-date mirror.
+#
+# original url: https://ftp.gnu.org/gnu/gmp/gmp-$(version)
+#
+
+url         = https://ftp.gnu.org/gnu/gmp
+
+versions    = 6.1.0 6.1.1 6.1.2 6.2.0 6.2.1
+
+suffix      = tar.xz
+
+tarballs    = $(addsuffix .$(suffix), $(addprefix gmp-, $(versions)))
+sha1s       = $(addsuffix .sha1sum, $(tarballs))
+
+all: $(tarballs) $(sha1s)
+
+.PHONY: downloads_clean
+
+$(tarballs):
+	@echo -e "\n======= Downloading source tarballs =======\n"
+	@for tarball in $(tarballs) ; do \
+	  wget -N $(url)/$$tarball ; \
+	done
+
+$(filter %.$(suffix).sha1sum,$(sha1s)): %.$(suffix).sha1sum : %.$(suffix)
+	@for tarball in $< ; do \
+	  echo -e "\n======= Calculation the '$$tarball' sha1sum =======\n" ; \
+	  sha1sum --binary $$tarball > $$tarball.sha1sum ; \
+	done
+
+$(filter %.tar.bz2.sha1sum,$(sha1s)): %.tar.bz2.sha1sum : %.tar.bz2
+	@for tarball in $< ; do \
+	  echo -e "\n======= Calculation the '$$tarball' sha1sum =======\n" ; \
+	  sha1sum --binary $$tarball > $$tarball.sha1sum ; \
+	done
+
+downloads_clean:
+	@rm -rf $(tarballs) $(sha1s)