Improve error message.

git-svn-id: https://svn.dealii.org/trunk@32676 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/source/lac/petsc_solver.cc b/deal.II/source/lac/petsc_solver.cc
index bf1cdbb142590894af7477b769d9be2e9dcaae33..4524e91c37ee7acff16b6b897f719e55455ed6df 100644 (file)
--- a/deal.II/source/lac/petsc_solver.cc
+++ b/deal.II/source/lac/petsc_solver.cc
@@ -803,7 +803,9 @@ namespace PETScWrappers
 #else  // PETSC_HAVE_MUMPS
     Assert (false,
             ExcMessage ("Your PETSc installation does not include a copy of "
-                        "MUMPS package necessary for this solver"));
+                        "the MUMPS package necessary for this solver. You will need to configure "
+                        "PETSc so that it includes MUMPS, recompile it, and then re-configure "
+                        "and recompile deal.II as well."));
 
     // Cast to void to silence compiler warnings
     (void) A;