Thank you all, I didn´t know this "yum install"-stuff, but good to know.
But I have some other packages I want to install and which I only have as .tar package.
I installed the gcc-c++ and I think now the "./configure" works, but the "make" command now says:
make: *** Keine Targets angegeben und keine »make«-Steuerdatei gefunden. Schluss.
translated (I think so): No targets listed and no >>make>>-control file found. End.
I guess its because it doesn´t find the files created by "./configure".
I´m a completely newby in Linux and especially Fedora, so...