[AGENT++] make: static_cast from 'pthread_t' (aka '_opaque_pthread_t *') to 'long' is not allowed

[m.gens]

Hello,

following error message was thrown 

static_cast from ‘pthread_t' (aka '_opaque_pthread_t *') to 'long' is not allowed


while running the make command.

What can I do to avoid this message?


Thank you very much in advance for any help.

Best Rgds.


                   Michael


OS: 
OS X 10.11.6