To build and install the source checked out from Subversion:
  ./autogen.sh <configure options>
  make
  make install


Configure options to autogen.sh can include any of the options available to
configure. Run ./configure --help to get a list of options.

Example to configure for installing in /usr/local/qgis:
  ./autogen.sh --prefix=/usr/local/qgis
  make
  make install