I have the same problem.

cc1plus: warning: changing search order for system directory "/usr/include"
cc1plus: warning: as it has already been specified as a non-system directory

during installation.

After one or two first runnings I got "Can't create SHA1 cache file /home/jlb/.qtella/sha1_cache", but now I don't. (/home/user/.qtella/sha1_cache exists). I got only many "fcntl: Bad file descriptor" messages, and then Qtella crashes (mostly after trying to download a file). (with "KCrash: crashing.... crashRecursionCounter = 2
KCrash: Application Name = qtella path = <unknown> pid = 2203")

I have also MDK 9.0. Somebody can help ?

new: for me it crashes when I attempt to download a second file.

P.S. Sorry for my terrible english. If You can't understend me, write, and I'll try to rewrite my post.