I thought this is an bug... but I found out, that it's not hanging, but instead the single steps of the installation process take so long. But especially extracting the data files into an FILE* is taking much too long.
The files are read from another FILE * - that one is a pipe to gzip process.
It seems that there is some perfomance issue with reading from pipes... I can't believe that the ungzip is the main problem here, becauseextracting data directly (via gzip commandline tool doesn't take that long).
Greets, Ole