instead of going through list of of possible standards seeing doesn't give errors, there simple gcc option can use (just checked, not likely) or config file or info file in system says?
use -std option control language standard used. values of either c89 (which same using -ansi c code) or c99 want, there gnu dialects of both, plus others listed in manpage.
-std=gnu89 default c, "gnu dialect of iso c90 (including c99 features)." (iso's 1990 c standard ansi's 1989 standard, known c89.)
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