GNULIB_REGEX_SINGLE_THREAD   56 maint/gnulib/lib/regex_internal.h #elif defined GNULIB_LOCK && !defined GNULIB_REGEX_SINGLE_THREAD
GNULIB_REGEX_SINGLE_THREAD   63 maint/gnulib/lib/regex_internal.h #elif defined GNULIB_PTHREAD && !defined GNULIB_REGEX_SINGLE_THREAD