Radix cross Linux 3pp sources

diff --git a/GNU/multiprecision/Makefile b/GNU/multiprecision/Makefile
new file mode 100644
index 0000000..15be211
--- /dev/null
+++ b/GNU/multiprecision/Makefile
@@ -0,0 +1,33 @@
+#
+# Download: https://www.multiprecision.org/mpc/download.html
+#
+# original url: https://www.multiprecision.org
+#
+
+url         = https://www.multiprecision.org/downloads
+
+versions    = 0.8.2 0.9 1.0 1.3.0
+
+suffix      = tar.gz
+
+tarballs    = $(addsuffix .$(suffix), $(addprefix mpc-, $(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)/$$tarball ; \
+	done
+
+$(sha1s): %.$(suffix).sha1sum : %.$(suffix)
+	@for tarball in $< ; do \
+	  echo -e "\n======= Calculation '$$tarball' sha1sum =======\n" ; \
+	  sha1sum --binary $$tarball > $$tarball.sha1sum ; \
+	done
+
+downloads_clean:
+	@rm -rf $(tarballs) $(sha1s)