Merge pull request #634 from jam7/update/bz2

Fix bz2.rb to solve several problems

packages/bz2.rb

 require 'package'
 
 class Bz2 < Package
-  version '1.4.17'
+  version '1.0.6'
   source_url 'http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz'
   source_sha1 '3f89f861209ce81a6bab1fd1998c0ef311712002'
 
+  depends_on 'diffutils' => :build
+
   def self.build
     system "make -f Makefile-libbz2_so"
   end
 
   def self.install
+    # bz2 Makefile doesn't have DESTDIR, so we need several tricks
+    # to make it install files correctly.
+
+    # Modify Makefile from "ln -s $(PREFIX)/bin/xxx $(PREFIX)/bin/yyy" to
+    # "ln -s xxx $(PREFIX)/bin/yyy"
+    system "sed", "-i", "Makefile", "-e", "/ln -s/s:$(PREFIX)/bin/::"
+
+    # Use PREFIX instead of DESTDIR
     system "make", "PREFIX=#{CREW_DEST_DIR}/usr/local", "install"
+
+    # Remove static library
+    system "rm", "#{CREW_DEST_DIR}/usr/local/lib/libbz2.a"
+
+    # Install bzip2 using shared library by hand
+    system "cp", "-p", "bzip2-shared", "bzip2"
+    system "cp", "-p", "bzip2", "#{CREW_DEST_DIR}/usr/local/bin/bzip2"
+    system "ln", "-sf", "bzip2", "#{CREW_DEST_DIR}/usr/local/bin/bunzip2"
+    system "ln", "-sf", "bzip2", "#{CREW_DEST_DIR}/usr/local/bin/bzcat"
+
+    # Install shared library by hand
+    system "cp", "-p", "libbz2.so.1.0.6", "#{CREW_DEST_DIR}/usr/local/lib"
+    system "ln", "-s", "libbz2.so.1.0.6", "#{CREW_DEST_DIR}/usr/local/lib/libbz2.so.1.0"
+
+    # Strip binaries and libraries
+    system "strip #{CREW_DEST_DIR}/usr/local/bin/bzip2"
+    system "strip #{CREW_DEST_DIR}/usr/local/bin/bzip2recover"
+    system "strip -S #{CREW_DEST_DIR}/usr/local/lib/*"
+  end
+
+  def self.check
+    system "make", "test"
   end
 end