+.PHONY: update-headers
+
+# When running "make dist" in a VPATH build with a read-only srcdir, Automake
+# will produce a distribution with all files read-only. Moreover, the files
+# are read-only in distdir when the dist hooks are run. This hook will
+# manually fix up the permissions. All dist hooks that modify files in distdir
+# should list unfuck-distdir as a prerequisite.
+dist-hook: unfuck-distdir
+unfuck-distdir:
+ find '$(distdir)' -type f -exec chmod u+w {} +
+.PHONY: unfuck-distdir
+
+GITLOG_FLAGS = --format='%s%n%n%b%n'
+
+dist-hook: generate-changelog
+generate-changelog: unfuck-distdir
+ -: "$${GIT_DIR=$(top_srcdir)/.git}"; \
+ export GIT_DIR; test -d "$$GIT_DIR" || exit 0; \
+ $(top_srcdir)/gitlog-to-changelog $(GITLOG_FLAGS) \
+ >'$(distdir)/ChangeLog.gen' && \
+ mv -f '$(distdir)/ChangeLog.gen' '$(distdir)/ChangeLog'
+ rm -f '$(distdir)/ChangeLog.gen'
+.PHONY: generate-changelog
+
+GENERIC_V = $(GENERIC_V_@AM_V@)
+GENERIC_V_ = $(GENERIC_V_@AM_DEFAULT_V@)
+GENERIC_V_0 = @printf '%2.0s%$(DX_ALIGN_V)s %s\n'
+
+TEST_DISTRIBUTION = false
+TEST_DISTRIBUTION_OR_ERROR = if $(TEST_DISTRIBUTION); \
+ then echo 'Proceeding anyway...'; \
+ else echo 'Run $(MAKE) TEST_DISTRIBUTION=true to ignore this failure.'; \
+ false; \
+ fi
+
+distcheck-hook:
+ $(GENERIC_V) : 'CHECK ' ChangeLog; \
+ $(AWK) '/^Stub/ { print FILENAME ":" NR ":", $$0; exit 1 }' \
+ $(distdir)/ChangeLog || { \
+ echo 'ERROR: *** Packaged ChangeLog was not properly generated from git log.'; \
+ echo ' *** The source version was used instead, but this appears to'; \
+ echo ' *** be the stub from a git checkout. The "git" and "perl"'; \
+ echo ' *** programs are required for ChangeLog generation to work.'; \
+ $(TEST_DISTRIBUTION_OR_ERROR); } >&2