-AC_CHECK_LIB(gmp, mpf_get_str, [LIBS="-lgmp $LIBS"],
- [AC_CHECK_LIB(gmp, __gmpf_get_str, [LIBS="-lgmp $LIBS"])],
- AC_MSG_ERROR(`You must install libgmp'))
+AC_CHECK_LIB(gmp, mpf_get_str,,
+ AC_CHECK_LIB(gmp, __gmpf_get_str,,
+ AC_MSG_ERROR([You must install libgmp])
+ )
+)
+
+AC_CHECK_LIB(gslcblas,main,,AC_MSG_ERROR([You must install libgslcblas]))
+AC_CHECK_LIB(gsl,gsl_set_error_handler,,AC_MSG_ERROR([You must install libgsl]))