diff --git a/build/build.py b/build/build.py
new file mode 100755
index 0000000000..9ac625411d
--- /dev/null
+++ b/build/build.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+
+import sys
+sys.path.append("../tools")
+
+import jsmin, mergejs
+
+sourceDirectory = "../lib"
+configFilename = "library.cfg"
+outputFilename = "OpenLayers.js"
+
+if len(sys.argv) > 1:
+    configFilename = sys.argv[1] + ".cfg"
+if len(sys.argv) > 2:
+    outputFilename = sys.argv[2]
+
+print "Adding license file."
+merged = file("license.txt").read()
+print "Merging libraries."
+merged += mergejs.run(sourceDirectory, None, configFilename)
+print "Compressing."
+minimized = jsmin.jsmin(merged)
+
+print "Writing to %s." % outputFilename
+file(outputFilename, "w").write(minimized)
+
+print "Done."
diff --git a/build/build.sh b/build/build.sh
deleted file mode 100755
index b5435a2268..0000000000
--- a/build/build.sh
+++ /dev/null
@@ -1,44 +0,0 @@
-#!/bin/sh
-
-#
-# Script to build compressed single file version of OpenLayers library
-#
-
-OUTPUT_FILENAME=OpenLayers.js
-TMP_OUTPUT_FILENAME=tmp.${OUTPUT_FILENAME}
-
-TOOLS_DIR=../tools
-
-if [ "$1" != "" ]; then
-  CFG_FILENAME="$1.cfg"
-else
-  CFG_FILENAME=library.cfg
-fi
-
-SRC_DIR=../lib
-
-CMD_MERGE_JS=${TOOLS_DIR}/mergejs.py
-
-CMD_SHRINKSAFE=${TOOLS_DIR}/shrinksafe.py
-CMD_JSMIN=${TOOLS_DIR}/jsmin.py
-
-LICENSE_HEADER_FILENAME=license.txt
-
-
-## Generate "fat" single file library version
-${CMD_MERGE_JS} -c ${CFG_FILENAME} ${TMP_OUTPUT_FILENAME} ${SRC_DIR}
-
-
-## Compress ("shrink") the single file library version
-
-echo
-echo Shrinking and post-processing...
-# (We also append the license header here.)
-cat ${LICENSE_HEADER_FILENAME} > ${OUTPUT_FILENAME}
-${CMD_JSMIN} <${TMP_OUTPUT_FILENAME} >> ${OUTPUT_FILENAME}
-
-echo Cleaning up...
-rm $TMP_OUTPUT_FILENAME
-
-echo
-echo Done.
diff --git a/tools/mergejs.py b/tools/mergejs.py
index 7b823f93df..95a705859f 100755
--- a/tools/mergejs.py
+++ b/tools/mergejs.py
@@ -127,28 +127,10 @@ class Config:
         self.include =  lines[lines.index("[include]") + 1:lines.index("[exclude]")]
         self.exclude =  lines[lines.index("[exclude]") + 1:]
 
-if __name__ == "__main__":
-    import getopt
-
-    options, args = getopt.getopt(sys.argv[1:], "-c:")
-    
-    try:
-        outputFilename = args[0]
-    except IndexError:
-        usage(sys.argv[0])
-        raise SystemExit
-    else:
-        sourceDirectory = args[1]
-        if not sourceDirectory:
-            usage(sys.argv[0])
-            raise SystemExit
-
+def run (sourceDirectory, outputFilename = None, configFile = None):
     cfg = None
-    if options and options[0][0] == "-c":
-        filename = options[0][1]
-        print "Parsing configuration file: %s" % filename
-
-        cfg = Config(filename)
+    if configFile:
+        cfg = Config(configFile)
 
     print cfg.include
     allFiles = []
@@ -227,6 +209,30 @@ if __name__ == "__main__":
 
     print "\nTotal files merged: %d " % len(allFiles)
 
-    print "\nGenerating: %s" % (outputFilename)
+    if outputFilename:
+        print "\nGenerating: %s" % (outputFilename)
+        open(outputFilename, "w").write("".join(result))
+    return "".join(result)
 
-    open(outputFilename, "w").write("".join(result))
+if __name__ == "__main__":
+    import getopt
+
+    options, args = getopt.getopt(sys.argv[1:], "-c:")
+    
+    try:
+        outputFilename = args[0]
+    except IndexError:
+        usage(sys.argv[0])
+        raise SystemExit
+    else:
+        sourceDirectory = args[1]
+        if not sourceDirectory:
+            usage(sys.argv[0])
+            raise SystemExit
+
+    configFile = None
+    if options and options[0][0] == "-c":
+        configFile = options[0][1]
+        print "Parsing configuration file: %s" % filename
+
+    run( sourceDirectory, outputFilename, configFile )