diff --git a/rtems/config/rtems-bsp.cfg b/rtems/config/rtems-bsp.cfg
index 4e6152d..8c8a512 100644
--- a/rtems/config/rtems-bsp.cfg
+++ b/rtems/config/rtems-bsp.cfg
@@ -129,7 +129,7 @@
 %define rtems_bsp_ldflags  %{pkgconfig ldflags %{_host}-%{rtems_bsp}}
 %define rtems_bsp_libs     %{pkgconfig libs    %{_host}-%{rtems_bsp}}
 
-%if %{rtems_bsp_cflags} == %{nil} && %{rtems_bsp_error}
+%if %{rtems_bsp_cflags} == %{nil} && %{rtems_bsp_error} && !%{_rsb_getting_source}
  %error No RTEMS BSP CFLAGS found; Please check the --with-rtems-bsp option.
 %endif