build gjs from source build problem

[Roelof Wobben <rwobben hotmail com>]

Hello,
 
I try to build gjs from source.
At a moment I asked for package 'mozjs185'
So I installed spidermonkey-1.8.5 without any problem.
 
But after that gjs is still complaining about a missing mozjs185 package.
 
Where can I find this package or which package provides this ?
 
Roelof