Description of problem:

I'm working to update gsl to 2.1 in Fedora which has a number of API changes.  orsa fails with:

../../../src/liborsa/orsa_orbit_gsl.cc: In function 'int orsa::least_sq_df(const gsl_vector*, void*, gsl_matrix*)':
../../../src/liborsa/orsa_orbit_gsl.cc:1006:40: warning: format '%i' expects argument of type 'int', but argument 3 has type 'size_t {aka long unsigned int}' [-Wformat=]
   i,j,result,abserr,gsl_vector_get(v,j));
                                        ^
../../../src/liborsa/orsa_orbit_gsl.cc:1006:40: warning: format '%i' expects argument of type 'int', but argument 4 has type 'size_t {aka long unsigned int}' [-Wformat=]
../../../src/liborsa/orsa_orbit_gsl.cc: In function 'void orsa::OrbitDifferentialCorrectionsLeastSquares(orsa::OrbitWithCovarianceMatrixGSL&, const std::vector<orsa::Observation>&)':
../../../src/liborsa/orsa_orbit_gsl.cc:1105:24: error: 'struct gsl_multifit_fdfsolver' has no member named 'J'
  gsl_multifit_covar(s->J,0.0,covar);
                        ^
../../../src/liborsa/orsa_orbit_gsl.cc:1116:29: error: 'struct gsl_multifit_fdfsolver' has no member named 'J'
       gsl_multifit_covar(s->J,0.0,par.covar);
                             ^
../../../src/liborsa/orsa_orbit_gsl.cc:1122:27: error: 'struct gsl_multifit_fdfsolver' has no member named 'J'
     gsl_multifit_covar(s->J,0.0,covar);
                           ^

orsa upstream appears to be pretty much dead to me, so I suspect this will have to be handled in Fedora.  I don't know if debian has already ported but may be worth a check.