Added the installation files for the "ndiff" package.

var/spack/repos/builtin/packages/ndiff/package.py

@@ -0,0 +1,21 @@
+from spack import *
+
+class Ndiff(Package):
+    """The ndiff tool is a binary utility that compares putatively similar files
+       while ignoring small numeric differernces. This utility is most often used
+       to compare files containing a lot of floating-point numeric data that
+       may be slightly different due to numeric error."""
+
+    homepage = "http://ftp.math.utah.edu/pub/ndiff/"
+    url      = "http://ftp.math.utah.edu/pub/ndiff/ndiff-2.00.tar.gz"
+
+    version('2.00', '885548b4dc26e72c5455bebb5ba6c16d')
+    version('1.00', 'f41ffe5d12f36cd36b6311acf46eccdc')
+
+    def install(self, spec, prefix):
+        configure('--prefix=%s' % prefix)
+
+        mkdirp(prefix.bin)
+        mkdirp('%s/lib' % prefix.share)
+
+        make('install-exe', 'install-shrlib')