acx_blas.m4:
acx_lapack.m4:
etr_socket_nsl.m4:
	From ac-archive.sourceforge.net. Modified at Inria.

rx_lib_search_gmp.m4:
rx_lib_search_mpsolve.m4:
rx_lib_search_udx.m4:
rx_prog_gxx_version.m4:
	Written here (Inria).
