From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 11 Mar 2021 10:59:11 +0000 (+0100)
Subject: Improve an error message.
X-Git-Tag: v9.3.0-rc1~341^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25e45f6c5182de5016b0d1422e9dbcd47a19494f;p=dealii.git

Improve an error message.
---

diff --git a/source/lac/trilinos_sparse_matrix.cc b/source/lac/trilinos_sparse_matrix.cc
index 0167dfc8b7..68718d448c 100644
--- a/source/lac/trilinos_sparse_matrix.cc
+++ b/source/lac/trilinos_sparse_matrix.cc
@@ -2215,7 +2215,12 @@ namespace TrilinosWrappers
                                         const_cast<Epetra_CrsMatrix &>(
                                           tmp_result.trilinos_matrix()));
 #  else
-      Assert("false", ExcMessage("This function requires EpetraExt."));
+      Assert("false",
+             ExcMessage("This function requires that the Trilinos "
+                        "installation found while running the deal.II "
+                        "CMake scripts contains the optional Trilinos "
+                        "package 'EpetraExt'. However, this optional "
+                        "part of Trilinos was not found."));
 #  endif
       result.reinit(tmp_result.trilinos_matrix());
     }