+cat <<EOF > _time_t.c
+#include <time.h>
+#include <assert.h>
+static_assert(sizeof(time_t) >= 8, "sizeof(time_t) < 8");
+EOF
+
+printf "Checking for 64 bit time_t... "
+if ${CC} -c _time_t.c -o /dev/null
+then
+ printf "Yes.\n"
+ have_64bit_time_t=1
+else
+ printf "No.\n"
+ have_64bit_time_t=0
+fi
+