Running slic3r i get fatal error.

[GithubersEver]

When executing curl slic3r.pl i get this error

[Zip-o-mat]

Have you tried what the error message reccomends?

[GithubersEver]

No, because i am new to this and i do not know how to change.

[Zip-o-mat]

You can try:
export GDK_BACKEND=x11
perl slic3r.pl