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+# Copyright (C) 2015-2017 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+mod.dist.description = `dist` target to create distribution tarballs
+define mod.dist.doc
+# User variables:
+# - `CP ?= cp`
+# - `GZIP ?= gzip`
+# - `MKDIR ?= mkdir`
+# - `MKDIR_P ?= mkdir -p`
+# - `MV ?= mv`
+# - `RM ?= rm -f`
+# - `TAR ?= tar`
+# - `GZIPFLAGS ?= $(GZIP_ENV)`
+# - `GZIP_ENV ?= --best` (only used via `GZIPFLAGS`, not directly)
+# Inputs:
+# - Global variable : `dist.exts` (Default: `.tar.gz`)
+# - Global variable : `dist.pkgname` (Default: first of PACKAGE_TARNAME PACKAGE PACKAGE_NAME)
+# - Global variable : `dist.version` (Default: first of PACKAGE_VERSION VERSION)
+# - Directory variable : `files.src`
+# Outputs:
+# - Directory variable : `files.out.int` (only in top dir)
+# - .PHONY Target : `$(outdir)/dist`
+# - Target : `$(topoutdir)/$(dist.pkgname)-$(dist.version)`
+# - Target : `$(topoutdir)/$(dist.pkgname)-$(dist.version).tar`
+# - Target : `$(topoutdir)/$(dist.pkgname)-$(dist.version).tar.gz`
+#
+# Provide the standard `dist` .PHONY target, based on the `files` module
+# information.
+#
+# You may change the default compression target easily via the
+# `dist.exts` variable, but you must define the rule for it manually.
+#
+# Bugs:
+#
+# The tarball isn't reproducible. It uses file-system ordering of
+# files, and includes timestamps.
+endef
+mod.dist.doc := $(value mod.dist.doc)
+
+PACKAGE_TARNAME ?=
+PACKAGE ?=
+PACKAGE_NAME ?=
+PACKAGE_VERSION ?=
+VERSION ?=
+
+# Developer configuration
+
+dist.exts ?= .tar.gz
+dist.pkgname ?= $(firstword $(PACKAGE_TARNAME) $(PACKAGE) $(PACKAGE_NAME))
+dist.version ?= $(firstword $(PACKAGE_VERSION) $(VERSION))
+
+ifeq ($(dist.pkgname),)
+$(error Autothing module: dist: dist.pkgname must be set)
+endif
+ifeq ($(dist.version),)
+$(error Autothing module: dist: dist.version must be set)
+endif
+
+_dist.files =
+
+# User configuration
+
+CP ?= cp
+GZIP ?= gzip
+MKDIR ?= mkdir
+MKDIR_P ?= mkdir -p
+MV ?= mv
+RM ?= rm -f
+TAR ?= tar
+
+GZIPFLAGS ?= $(GZIP_ENV)
+GZIP_ENV ?= --best