First you need the `git' command, to fetch a copy of the client source tree.  On Ubuntu
(I guess most other linux distributions too) this command is part of the `git-core'
package.  Install it using your favourite package tool (e.g. apt-get, aptitude,
synaptic).
Next, in a shell change to a directory where you want the copy of the client to be
placed.  For example change to your home directory:
  # cd ~
Now you can fetch your copy of the client sources:
  # git clone git://bloodspilot.git.sourceforge.net/gitroot/bloodspilot/bloodspilot2-clients
If this command was successful, it has fetched all files of the bloodspilot clients
development version to a sub-directory `bloodspilot2-clients' of your current directory.
Change into this directory:
  # cd bloodspilot2-clients
Run the `bootstrap' script (prepares the sourcecode for compilation):
  # ./bootstrap
If everything worked well so far, you are ready to build the client(s) of your choice.
I recommend the X11 client.  You can build it with some experimental features with:
  # ./build-x11.sh "CPPFLAGS=-DANGEBA_MODS"
If you want to install the client somewhere else than `/usr/local', you need to add
the `--prefix' option instead.  The following would build for installation into your
home directory:
  # ./build-x11.sh "--prefix=$HOME" "CPPFLAGS=-DANGEBA_MODS"
If the build succeeded, you are ready to install the client with:
  # make install
In case you need root privileges to install (e.g. to install in `/usr/local'), then
install with:
  # sudo make install
On success you now have the executable `bloodspilot-client-x11' in the `bin'
subdirectory of your installation directory (default `/usr/local') ready to be
started.
For additional information, see also the `INSTALL' and `INSTALL.ubuntu' files in the
client directory.