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+ABI_VERSION := 0
+
+# These lines are automatically replaced in tarballs generated by 'make dist'
+# Note so you stop forgetting: export-subst attribute can't do tag-relative
+VERSION_FULL := $(shell git --git-dir=${SRC_DIR}/.git describe --tags HEAD)
+VERSION_HASH := $(shell git --git-dir=${SRC_DIR}/.git rev-parse HEAD)
+
+version_bits := $(subst v, ,$(subst -, ,$(subst ., ,${VERSION_FULL})))
+# Note: these four numbers are limited to 255.
+# Currently, my tags are yy.mm.dd instead of semantic versioning.
+# The dev number is how many commits since the last tag.
+VERSION_MAJOR := $(word 1,${version_bits})
+VERSION_MINOR := $(word 2,${version_bits})
+VERSION_PATCH := $(word 3,${version_bits})
+VERSION_DEVEL := $(word 4,${version_bits})
+ifeq "${VERSION_DEVEL}" ""
+ VERSION_DEVEL := 0
+endif
+
+
+
+# Settings for those distributing modified versions.
+#
+# It is strongly recommended that all distributors set these,
+# but the only *requirement* is that modified versions that are run
+# (semi)publicly give VENDOR_SOURCE to satisfy section 13 of the AGPLv3.
+
+# TODO should these be passed to configure instead?
+
+# Vendor Name: String (no newlines, no parentheses)
+# This is usually one word, and does not (usually) change over time.
+# (Examples: Gentoo, Debian, Fedora, Ubuntu)
+VENDOR_NAME := Vanilla
+# Vendor Point: Integer (max value 65535)
+# This is intended to be the "packaging revision number", assuming that's
+# an integer. At a minimum, please try to make it nonzero if you have
+# any non-upstream patches (unconditionally nonzero is also okay).
+# (If your revision 0 package has patches ... please be nicer to upstream)
+VENDOR_POINT := 0
+# URL where the source may be found (after searching for version number).
+# See AGPLv3 section 13
+VENDOR_SOURCE := https://github.com/themanaworld/tmwa
+
+# Convenience
+VERSION_STRING := TMWA ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH} dev${VERSION_DEVEL} +${VENDOR_POINT} (${VENDOR_NAME})
+VERSION_DOTS := ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}.${VERSION_DEVEL}.${VENDOR_POINT}
+
+# Shared libraries
+SO_SHORT := so.${ABI_VERSION}
+SO_LONG := ${SO_SHORT}.${VERSION_DOTS}
+# and thanks for all the fish
+
+version:
+ @echo version '${VERSION_STRING}'
+ @echo based on commit ${VERSION_FULL} aka ${VERSION_HASH}
+ @echo source ${VENDOR_SOURCE}
+ @echo abi version ${ABI_VERSION}
+ @echo 'lib so -> ${SO_SHORT} -> ${SO_LONG}'