several regressions with respect to Qt 4.x. See #9215 for a list of bugs
related to compiling LyX with different versions of Qt.
+* The Qt libraries must have support for the SVG graphic format, because
+ LyX now uses svg icons. If this support is lacking, icons cannot be shown.
+
* If compiling LyX on Windows with Qt 5.6, it is recommended to use MSVC 2015
update 2 to avoid #9892.
starting LyX as 'XMODIFIERS= lyx'. For further discussion and alternative
workarounds, see #9362.
+* LyX can produce LuaTeX output that is not compatible with the newest versions
+ of the engine (e.g. 0.95.0, the version in TeX Live 2016). In a later 2.2.x
+ version we plan to implement exporting of LuaTeX code that is compatible
+ with the LuaTeX versions shipped with both TeX Live 2015 and TeX Live 2016.
+ For more information, see the following mailing list thread:
+ https://www.mail-archive.com/search?l=mid&q=20160520075810.yi3uspufehev5aln%40cotopaxi
+
!!Caveats when upgrading from earlier versions to 2.2.x