Finishing touches for portability.
* jk/commit-dates-parsing-fix:
t4212: loosen far-in-future test for AIX
date: recognize bogus FreeBSD gmtime output
# (defaults to "man") if you want to have a different default when
# "git help" is called without a parameter specifying the format.
#
+# Define TEST_GIT_INDEX_VERSION to 2, 3 or 4 to run the test suite
+# with a different indexfile format version. If it isn't set the index
+# file format used is index-v[23].
++#
+ # Define GMTIME_UNRELIABLE_ERRORS if your gmtime() function does not
+ # return NULL when it receives a bogus time_t.
GIT-VERSION-FILE: FORCE
@$(SHELL_PATH) ./GIT-VERSION-GEN