[Samba] Can not build Samba 4.7.10

[Thomas Nintemann]

Samba 4.7.10 is unwilling to find my pyldb-util v 1.2.3

Checking for system pyldb-util (>=1.2.3 <=1.2.999)                      
                          : not found
ERROR: System library pyldb-util of version 1.2.3 not found, and  
bundling disabled

Building of Samba 4.7.9 in the same environment works flawlessly.
What goes wrong in Samba 4.7.10 with detection of pylab?

Regards,

Thomas