TeXStudio 2.10.6 was released January 9th.
It includes a fix for building with Qt 5.6
commit a95ec810e9abe928e0e07b84ce8837b473489c77 Author: Manuel Rüger <mrueg@gentoo.org> Date: Sun Jan 17 16:46:16 2016 +0100 app-office/texstudio: Version bump Gentoo-Bug: 571950 Package-Manager: portage-2.2.26