diff -r 000000000000 -r 1918ee327afb config.tests/unix/which.test
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/config.tests/unix/which.test	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+HOME=/dev/null
+export HOME
+
+unset which
+
+WHICH=`which which 2>/dev/null`
+if echo $WHICH | grep 'shell built-in command' >/dev/null 2>&1; then
+    WHICH=which
+elif [ -z "$WHICH" ]; then
+    if which which >/dev/null 2>&1; then
+	WHICH=which
+    else
+	for a in /usr/ucb /usr/bin /bin /usr/local/bin; do
+	    if [ -x $a/which ]; then
+		WHICH=$a/which
+		break;
+	    fi
+	done
+    fi
+fi
+
+if [ -z "$WHICH" ]; then
+    IFS=:
+    for a in $PATH; do
+	if [ -x $a/$1 ]; then
+	    echo "$a/$1"
+	    exit 0
+	fi
+    done
+else
+    a=`"$WHICH" "$1" 2>/dev/null`
+    if [ ! -z "$a" -a -x "$a" ]; then
+	echo "$a"
+	exit 0
+    fi
+fi
+exit 1