Building and installing pg_proctab

Hello,

picture:
i've got ubuntu 24.04 with postgresql 18 on it. Now I want to install
pg_proctab on it for monitoring reasons.

i downloaded it from

https://gitlab.com/pg_proctab/pg_proctab/

and i tried to make it.

the docs says

make
make install
etc.

but when i do make in the root of pg_proctab i get the error

"Makefile:29: /contrib/contrib-global.mk: No such file or directory
make: *** No rule to make target '/contrib/contrib-global.mk'.  Stop."

so i'm stuck now. 

cant find a thing on the big internet and even ai isnt very helpfull.

is there someone who can point me in the right directory?

best regards,

alexander al.