Links cond2test against dune-istl

dune/istl/eigenvalue/test/CMakeLists.txt

@@ -2,19 +2,21 @@
 # SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
 
 dune_add_test(NAME poweriterationtest SOURCES cond2test.cc
+  LINK_LIBRARIES Dune::ISTL
   CMD_ARGS 40)
 
 if(SuperLU_FOUND)
   dune_add_test(NAME poweriterationsuperlutest SOURCES cond2test.cc
+    LINK_LIBRARIES Dune::ISTL
     CMD_ARGS 40)
   add_dune_superlu_flags(poweriterationsuperlutest)
 endif()
 
 if(ARPACKPP_FOUND)
-  dune_add_test(NAME arpackpptest SOURCES cond2test.cc)
+  dune_add_test(NAME arpackpptest SOURCES cond2test.cc LINK_LIBRARIES Dune::ISTL)
   add_dune_arpackpp_flags(arpackpptest)
 endif()
 
 if(ARPACKPP_FOUND AND SuperLU_FOUND)
-  dune_add_test(NAME arpackppsuperlutest SOURCES cond2test.cc)
+  dune_add_test(NAME arpackppsuperlutest SOURCES cond2test.cc LINK_LIBRARIES Dune::ISTL)
 endif()