Under Ubuntu 9.04 install:
  -add following lines to /etc/apt/sources.list
     deb http://gnuradio.org/ubuntu stable main
     deb-src http://gnuradio.org/ubuntu stable main
  -type
  $ sudo apt-get update
  $ sudo apt-get install gnuradio libtool automake libgsm-tools libpcap-dev

To build the GSM Receiver use:
  $ ./bootstrap
  $ cd debug 
  $ ../configure
  $ make