Comment # 22 on bug 921577 from Michel Normand

Created attachment 650515 [details]
doxygen_ppc64le_ignore_DOT_NUM_THREADS_to_0.patch

in reply to Comment #21 the suggested change in 
home:pgajdos:doxygen-ppc64le/doxygen  
is working specifically for doxygen-doc package.

But I would suggest the attached
doxygen_ppc64le_ignore_DOT_NUM_THREADS_to_0.patch 
as replacement to be able to have the bypass for all packages using doxygen
without the need to change their configuration file.