https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91902
--- Comment #2 from Georgy <akulishe95 at mail dot ru> --- No, I have two directories. One has name "gcc-4.9.2" and the other has name "gcc4.9.2". The source code is inside "gcc-4.9.2". The folder "gcc4.9.2" is empty and was made specially to use it as "prefix".
