LU solver results differing from numpy's

[MaximeLee]

I want to use gsl LU solver. But when comparing with Scipy's LU solver the results are a different. The zip archive contains the source main.c file that solves the linear sytem Ax = b with A the matrix in the A.dat file written using gsl_matrix_fwrite and b the vector whose only non-zero component is the last with value -1. Finally the test.py file print scipy's solution.

The solutions I get are with
GSL:

-0.944006998359841698054140124441 
2.689851515690580452400126887369 
-0.745844517330738865368289225444 
-0.000000000000231038487010262759

Scipy:

-5.40764393e-01  
2.99927045e+00 
-1.45850606e+00 
-2.47812410e-13

gsl_lu.zip