C-= does not register

[rogpld]

(pgtk-use-im-context nil)

C-= works, single quote and accents do not work

(pgtk-use-im-context t)

C-= does not works, single quote and accents work

How can I get both working?

[masm11]

Does your single quote need special keys?

[rogpld]

No, I was using a traditional US-international with dead keys layout. Did not managed to get it working. If I'm not mistaken accents did not work as expected as well.