apenwarr-redo/docs/cookbook/c/rc/posix.rc.od

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rc_include rc/CC.rc
prog='
#include <time.h>
struct timespec x;
'
x=
rc_replaceln HAVE_POSIX 1
if ! rc_compile cc link "$prog"; then
x="-D_XOPEN_SOURCE=500"
rc_appendln CPPFLAGS "$x"
if ! rc_compile cc link "$prog"; then
rc_undo
rc_replaceln HAVE_POSIX ""
fi
fi
rc_save