.PHONY: ChangeLog
+all: pdclib/Makefile
+all-recursive: pdclib/Makefile
+
+pdclib/Makefile:
+ git submodule update
+
ChangeLog:
(GIT_DIR=$(top_srcdir)/.git git log > .changelog.tmp && mv .changelog.tmp ChangeLog; rm -f .changelog.tmp) || \
(touch ChangeLog; echo 'git directory not found: installing possibly empty changelog.' >&2)