Adding a new source file inside prereqs/linalg
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The procedure to add a new BLAS or LAPACK routine is quite simple:

  * unpack the tarball;
  * add the routine and its dependencies;
  * add the object files to the list in the Makefile;
  * repack the tarball as lapack-abinit_x.x.tar.gz where x.x indicates the abinit version;
  * check that it builds;
  * remove the old tarball;
  * edit config/m4/init.m4 updating the variable linalg_pkg_name;
  * edit _linalg_ adding the new interfaces;
  * let Bazaar know about the change.

