@codebrainz, the author [says](https://github.com/Maximus5/ConEmu/blob/master/src/HowToBuild.md#how-to-buil...) that ConEmu can be a compiled with GnuC on MinGW, not only MSVC. But, I meaned this within the confines for Windows speсially, where is no embedded terminal; not for whole project.
@elextr, ok, I did not know that it's impossible to embed a window in a GTK widget; it seems that was a unlucky idea.