1 files changed, 1 insertions, 0 deletions
diff --git a/src/im-asapo.h b/src/im-asapo.h
index ab68e1c2..e61ed530 100644
--- a/src/im-asapo.h
+++ b/src/im-asapo.h
@@ -61,6 +61,7 @@ static UNUSED struct im_asapo *im_asapo_connect(const char *endpoint,
                                                 const char *data_source,
                                                 const char *stream)
 {
+	ERROR("This installation of CrystFEL was compiled without ASAP::O support.\n");
 	return NULL;
 }