parse-datetime.c generated out of parse-datetime.y ends up in the source directory, instead of the build directory as one would expect. This was introduced by the following commit:
http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=6c680191 Neither the comment, nor the change log entry explains why it is desired. As far as I know, the build should work even if the source directory is on a read-only file system. Moreover, this oddity seems to cause problems to the debug info extractor used by rpmbuild in Fedora: https://bugzilla.redhat.com/1555079 Kamil
