[Bug 1067110] /usr/include/features.h:145:3: error: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Werror=cpp

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1067110

--- Comment #13 from Jens Petersen  ---
https://github.com/ghc/ghc/blob/master/includes/Stg.h#L49 currently has:

:
#ifndef IN_STG_CODE
# define IN_STG_CODE 1

// Turn on C99 for .hc code.  This gives us the INFINITY and NAN
// constants from math.h, which we occasionally need to use in .hc (#1861)
# define _ISOC99_SOURCE

// We need _BSD_SOURCE so that math.h defines things like gamma
// on Linux
# define _BSD_SOURCE
#endif
:

Any suggestions for now to update that to prefer _DEFAULT_SOURCE
upstream in a portable manner?