diff --git a/build-config/meson.build b/build-config/meson.build
index f7f6466..18e4720 100644
--- a/build-config/meson.build
+++ b/build-config/meson.build
@@ -5,3 +5,18 @@ subdir('yaml-cpp')
 subdir('quill')
 subdir('boost')
 subdir('opatIO')
+subdir('mpi')
+subdir('hypre')
+
+# Set the config file error handling options
+configErr = get_option('config_error_handling')
+
+# build up any -D flags we need
+commonCppArgs = []
+if configErr == 'warn'
+    commonCppArgs += ['-DCONFIG_WARN']
+elif configErr == 'harsh'
+    commonCppArgs += ['-DCONFIG_HARSH']
+endif
+
+add_project_arguments(commonCppArgs, language: 'cpp')
\ No newline at end of file