Add a dirty trick to find/test PETSc

packages/cmake-modules/FindPETSc.cmake

@@ -278,7 +278,14 @@ int main(int argc,char *argv[]) {
   return 0;
 }
 ")
-    multipass_source_runs ("${includes}" "${libraries}" "${_PETSC_TEST_SOURCE}" ${runs} "${PETSC_LANGUAGE_BINDINGS}")
+    multipass_source_runs(
+      "${includes} ${MPI_CXX_INCLUDE_DIRS} ${MPI_CXX_COMPILER_INCLUDE_DIRS}"
+      "${libraries}"
+      "${_PETSC_TEST_SOURCE}"
+      ${runs}
+      "${PETSC_LANGUAGE_BINDINGS}"
+      )
+
     if (${${runs}})
       set (PETSC_EXECUTABLE_RUNS "YES" CACHE BOOL
         "Can the system successfully run a PETSc executable?  This variable can be manually set to \"YES\" to force CMake to accept a given PETSc configuration, but this will almost always result in a broken build.  If you change PETSC_DIR, PETSC_ARCH, or PETSC_CURRENT you would have to reset this variable." FORCE)