Add bzip2 package and spack pkg add command.

var/spack/packages/bzip2/package.py

@@ -0,0 +1,19 @@
+from spack import *
+
+class Bzip2(Package):
+    """bzip2 is a freely available, patent free high-quality data
+       compressor. It typically compresses files to within 10% to 15%
+       of the best available techniques (the PPM family of statistical
+       compressors), whilst being around twice as fast at compression
+       and six times faster at decompression."""
+    homepage = "http://www.bzip.org"
+    url      = "http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz"
+
+    version('1.0.6', '00b516f4704d4a7cb50a1d97e6e8e15b')
+
+    def install(self, spec, prefix):
+        # No configure system -- have to filter the makefile for this package.
+        filter_file(r'CC=gcc', 'CC=cc', 'Makefile', string=True)
+
+        make()
+        make("install", "PREFIX=%s" % prefix)