Add nmon package

packages/nmon.rb

+require 'package'
+
+class Nmon < Package
+  description "nmon is short for Nigel's performance MONitor for Linux"
+  homepage 'http://nmon.sourceforge.net/pmwiki.php'
+  version '16g'
+  source_url 'http://downloads.sourceforge.net/project/nmon/lmon16g.c'
+  source_sha256 'da82dd693b503b062854dfe7dbb5d36b347872ab44a4aa05b97e9d577747f688'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'ncurses'
+
+  def self.build
+    system 'wget http://downloads.sourceforge.net/project/nmon/lmon16g.c'
+    abort 'Checksum mismatch. :/ Try again.'.lightred unless Digest::SHA256.hexdigest( File.read('lmon16g.c') ) == 'da82dd693b503b062854dfe7dbb5d36b347872ab44a4aa05b97e9d577747f688'
+    system "sed -i 's,<ncurses.h>,<#{CREW_PREFIX}/include/ncurses/ncurses.h>,' lmon16g.c"
+    system 'cc -o nmon lmon16g.c -g -O3 -Wall -D JFS -D GETUSER -D LARGEMEM -lncurses -lm -g -D POWER'
+  end
+
+  def self.install
+    system "install -Dm755 nmon #{CREW_DEST_PREFIX}/bin/nmon"
+  end
+end