--- bin/jruby.orig	2010-12-04 01:58:22.000000000 +0900
+++ bin/jruby	2010-12-30 06:00:45.000000000 +0900
@@ -28,15 +28,14 @@
 while [ -h "$PRG" ] ; do
   ls=`ls -ld "$PRG"`
   link=`expr "$ls" : '.*-> \(.*\)$'`
-  if expr "$link" : '.*/.*' > /dev/null; then
-    if expr "$link" : '/' > /dev/null; then
+  case "$link" in
+    /*)
       PRG="$link"
-    else
+      ;;
+    *)
       PRG="`dirname ${PRG}`/${link}"
-    fi
-  else
-    PRG="`dirname $PRG`/$link"
-  fi
+      ;;
+  esac
 done
 
 JRUBY_HOME_1=`dirname "$PRG"`           # the ./bin dir