build software from source

[mheily]

For software that isn't available as a package/port, launchd(8) could include instructions on how to build and install the software. Example:

'Build': {
  'SourceURI': 'http://acme.com/software/thttpd/thttpd-2.27.tar.gz',
  'Depends': [
    'autoconf',
    'automake',
    'libtool',
    'libssl',
  ],
  'BuildCommands': [
       './configure --prefix=/usr/local',
       'make',
   ],
  'InstallCommands': [
      'make install',
  ],
},