Running the gfortran testsuite under "sudo" shows failures on some tests. See http://gcc.gnu.org/ml/fortran/2006-08/msg00025.html and follow-up messages for more information.
-- Summary: gfortran testsuite failures with sudo Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: testsuite AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: fxcoudert at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28610