Error while building realview_pbx_a9 BSP with the new build system

[Utkarsh Rai]

Hello,
I have been trying out the new build system. Unfortunately, while
building for the realview_pbx_a9 BSP I get the following error on ' ./waf
install '  -

"
Waf: Entering directory `/home/utkarsh/new_build/rtems/build'
Waf: Leaving directory `/home/utkarsh/new_build/rtems/build'
'install' finished successfully (0.289s)
Waf: Entering directory
`/home/utkarsh/new_build/rtems/build/arm/realview_pbx_a9_qemu'
Waf: Leaving directory
`/home/utkarsh/new_build/rtems/build/arm/realview_pbx_a9_qemu'

source not found: 'cpukit/include/rtems/system.h' in bld(target='', idx=59,
install_task=
 {task 139909380107600: inst  -> }, dest='${BSP_INCLUDEDIR}/rtems',
tg_idx_count=59, meths=['process_install_task', 'process_rule',
'process_source'], _name='', source=[],
install_to='${BSP_INCLUDEDIR}/rtems', path=/home/utkarsh/new_build/rtems,
install_from=['cpukit/include/rtems/assoc.h'
[...]
"
My config.ini file has all the contents of  './waf bsp_defaults
--rtems-bsps=arm/realview_pbx_a9'. Can you please point out my mistake?
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