Hi Adrian,
make[1]: Betrete Verzeichnis '/home/adrian/genode-14.11/build/build.fs' Error: target 'test/libc_vfs' does not exist make[1]: *** [error_missing_targets] Fehler 1
it looks like the libports repository is not enabled in the 'etc/build.conf' file of your build directory. For reference, the test program is located at 'repos/libports/src/test/libc_vfs/'.
Cheers Norman