First check in

Makefile

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+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as 
+# published by the Free Software Foundation here:
+# (http://www.gnu.org/licenses/gpl-2.0.html)
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+DEPENDS =
+ARCH = x86_64
+URL = https://gmplib.org/
+DESC = GMP is a free library for arbitrary precision arithmetic
+SNAPVER = sr0
+
+ARCHIVE := $(PWD)/SRC/$(shell ls SRC|egrep '(bz2|gz|tar|xz)$$'|tail -1)
+TYPE := $(shell file -ib $(ARCHIVE)|cut -d';' -f1|tr -d '\n')
+SRCDIR := $(shell tar -tf $(ARCHIVE)|head -1|sed 's/\/.*//')
+PATCHDIR := $(PWD)/SRC/patches
+VERSION := $(shell echo $(SRCDIR)|egrep -o '\-[0-9].*'|sed 's/^-//')$(SNAPVER)
+
+MAKE = make && make html
+MAKEINST = make install && make install-html
+SNAPHACKS =
+
+include /usr/share/snap/Makefile.snaplinux
+
+$(SRCDIR)/configure: $(ARCHIVE)
+	@if [ '$(TYPE)' == 'application/x-bzip2' ]; then \
+		tar -jxf $(ARCHIVE); \
+	elif [ '$(TYPE)' == 'application/x-gzip' ]; then \
+		tar -zxf $(ARCHIVE); \
+	elif [ '$(TYPE)' == 'application/x-tar' ]; then \
+		tar -xf $(ARCHIVE); \
+	elif [ '$(TYPE)' == 'application/x-xz' ]; then \
+		tar -xf $(ARCHIVE); \
+	else \
+		echo 'Unable to determine archive type'; \
+		exit 1; \
+	fi
+	@touch $(SRCDIR)/configure
+
+$(SRCDIR)/config.log: $(SRCDIR)/configure
+	@if [ -f $(PATCHDIR)/*.patch ]; then \
+		cd $(SRCDIR) && cat $(PATCHDIR)/*.patch|patch --verbose -Np1; \
+	fi
+	@cd $(SRCDIR); \
+	./configure \
+		--prefix=/usr \
+		--enable-cxx \
+		--disable-static \
+		--build=x86_64-snap-linux-gnu \
+		--host=x86_64-snap-linux-gnu \
+		--target=x86_64-snap-linux-gnu
+
+$(SRCDIR)/libgmp.la: $(SRCDIR)/config.log
+	@cd $(SRCDIR); \
+	$(MAKE)
+
+$(ROOT): $(SRCDIR)/libgmp.la
+	@if [ -d $(ROOT) ]; then \
+		touch $(ROOT); \
+	else \
+		mkdir -v $(ROOT); \
+	fi
+
+	@cd $(SRCDIR); \
+	$(MAKEINST) DESTDIR=$(ROOT)
+
+	@$(SNAPHACKS)
+
+test: $(ROOT)
+	@cd $(SRCDIR); \
+	make check
+
+clean:
+	@rm -rvf $(ROOT) \
+		$(SNAPINFO) \
+		$(MANIFEST) \
+		$(FILES) \
+		$(SRCDIR)
+

SNAP/README

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+This is the directory where the manifest, snapinfo, and files.tar.gz
+files will be created. It is also where the usher file should be
+placed if it is required by the package.

SRC/patches/README

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+Place any patch files here and preface each with a number indicating
+the order of execution. Patch files are expected to use a .patch extension.