_XOPEN_SOURCE      68 maint/gnulib/lib/fnmatch.in.h #ifdef _XOPEN_SOURCE
_XOPEN_SOURCE      93 maint/gnulib/lib/poll.in.h # if !defined (_POSIX_C_SOURCE) && !defined (_XOPEN_SOURCE)
_XOPEN_SOURCE     373 maint/gnulib/lib/regex.h #if defined _XOPEN_SOURCE || defined __USE_XOPEN2K
_XOPEN_SOURCE      31 maint/gnulib/lib/sys_select.in.h              && (! (defined _XOPEN_SOURCE || defined _POSIX_C_SOURCE)   \
_XOPEN_SOURCE      44 maint/gnulib/lib/sys_select.in.h                        && (! (defined _XOPEN_SOURCE                     \