C11 compiler is necessary:
In file included from codec_g72x.c:26:
/usr/local/include/asterisk/lock.h: In function 'ast_atomic_fetchadd_int':
/usr/local/include/asterisk/lock.h:752: error: '__ATOMIC_RELAXED' undeclared (first use in this function)
/usr/local/include/asterisk/lock.h:752: error: (Each undeclared identifier is reported only once
/usr/local/include/asterisk/lock.h:752: error: for each function it appears in.)
/usr/local/include/asterisk/lock.h: In function 'ast_atomic_dec_and_test':
/usr/local/include/asterisk/lock.h:762: error: '__ATOMIC_RELAXED' undeclared (first use in this function)
MFH: 2020Q1 (fix build blanket)
23607f7116