It is not a part of standard time.h. Glibc put it under time.h however musl treat it as a sys timex extension. Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> --- configure | 1 + 1 file changed, 1 insertion(+) diff --git a/configure b/configure index c228f7c21e..990f37e123 100755 --- a/configure +++ b/configure @@ -4374,6 +4374,7 @@ fi clock_adjtime=no cat > $TMPC <<EOF #include <time.h> +#include <sys/timex.h> int main(void) { -- 2.29.2