Added tmux and supporting packages (ncurses and libevent)

var/spack/packages/libevent/package.py

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+from spack import *
+
+class Libevent(Package):
+    """The libevent API provides a mechanism to execute a callback function
+       when a specific event occurs on a file descriptor or after a timeout has been
+       reached. Furthermore, libevent also support callbacks due to signals or regular
+       timeouts.
+    """
+
+    homepage = "http://libevent.org"
+    url      = "https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz"
+    list_url = "http://libevent.org/old-releases.html"
+
+    versions =   {
+      '2.0.21' : 'b2405cc9ebf264aa47ff615d9de527a2',
+      '2.0.20' : '94270cdee32c0cd0aa9f4ee6ede27e8e',
+      '2.0.19' : '91111579769f46055b0a438f5cc59572',
+      '2.0.18' : 'aa1ce9bc0dee7b8084f6855765f2c86a',
+      '2.0.17' : 'dad64aaaaff16b5fbec25160c06fee9a',
+      '2.0.16' : '899efcffccdb3d5111419df76e7dc8df',
+      '2.0.15' : '2643abe7ba242df15c08b2cc14ec8759',
+      '2.0.14' : 'cac0f379da35d3b98f83ac16fcfe1df4',
+      '2.0.13' : 'af786b4b3f790c9d3279792edf7867fc',
+      '2.0.12' : '42986228baf95e325778ed328a93e070',
+    }
+
+    def install(self, spec, prefix):
+        configure("--prefix=%s" % prefix)
+
+        make()
+        make("install")

var/spack/packages/ncurses/package.py

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+from spack import *
+
+class Ncurses(Package):
+    """The ncurses (new curses) library is a free software emulation of curses
+       in System V Release 4.0, and more. It uses terminfo format, supports pads and
+       color and multiple highlights and forms characters and function-key mapping,
+       and has all the other SYSV-curses enhancements over BSD curses.
+    """
+
+    homepage = "http://invisible-island.net/ncurses/ncurses.html"
+    url      = "http://invisible-island.net/datafiles/release/ncurses.tar.gz"
+
+    versions = { 'stable' : '8cb9c412e5f2d96bc6f459aa8c6282a1' }
+
+    def install(self, spec, prefix):
+        configure("--prefix=%s" % prefix)
+        make()
+        make("install")
+
+    def url_for_version(self, version):
+        return "http://invisible-island.net/datafiles/release/ncurses.tar.gz"

var/spack/packages/tmux/package.py

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+from spack import *
+
+class Tmux(Package):
+    """tmux is a terminal multiplexer. What is a terminal multiplexer? It lets
+       you switch easily between several programs in one terminal, detach them (they
+       keep running in the background) and reattach them to a different terminal. And
+       do a lot more.
+    """
+
+    homepage = "http://tmux.sourceforge.net"
+    url      = "http://downloads.sourceforge.net/project/tmux/tmux/tmux-1.9/tmux-1.9a.tar.gz"
+
+    versions = { '1.9a' : 'b07601711f96f1d260b390513b509a2d', }
+
+    depends_on('libevent')
+    depends_on('ncurses')
+
+    def install(self, spec, prefix):
+        configure(
+            "--prefix=%s" % prefix,
+            "PKG_CONFIG_PATH=%s:%s" % (spec['libevent'].prefix, spec['ncurses'].prefix))
+
+        make()
+        make("install")