--- /dev/null
+. "$COMMON/platform.sh"
+
+MTIME="stat -c %Y"
+case "$UNAME" in
+ Darwin | FreeBSD | OpenBSD | NetBSD) MTIME="stat -f %m" ;;
+esac
+
+assertSameMTime() {
+ MT1=$($MTIME "$1")
+ MT2=$($MTIME "$2")
+ echo MTIME $MT1 $MT2
+ [ "$MT1" = "$MT2" ] || die "mtime on $1 doesn't match mtime on $2 ($MT1 != $MT2)"
+}