Radix cross Linux 3pp sources

diff --git a/GNU/mpc/Makefile b/GNU/mpc/Makefile
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--- /dev/null
+++ b/GNU/mpc/Makefile
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+#
+# 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/mpc/mpc-$(version)
+#
+
+url         = https://ftp.gnu.org/gnu/mpc
+
+versions    = 1.0.1 1.0.2 1.0.3 1.1.0 1.2.0 1.2.1 1.3.0 1.3.1
+
+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)
diff --git a/GNU/mpc/mpc-1.0.1.pdf b/GNU/mpc/mpc-1.0.1.pdf
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diff --git a/GNU/mpc/mpc-1.3.1.txt b/GNU/mpc/mpc-1.3.1.txt
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+++ b/GNU/mpc/mpc-1.3.1.txt
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+
+sources: https://multiprecision.org/download.html
+
+Requirements of 1.3.1: gmp-5.0.0, mpfr-4.1.0