$ tar -xzf dub-0.9.22-rc.2-linux-x86_64.tar.gz
$ ./dub -h
$ ./dub: error while loading shared libraries: libcurl-gnutls.so.4: cannot open shared object file: No such file or directory
DUB 0.9.21 runs successfully
$ tar -xzf dub-0.9.22-rc.2-linux-x86_64.tar.gz
$ ./dub -h
$ ./dub: error while loading shared libraries: libcurl-gnutls.so.4: cannot open shared object file: No such file or directory
DUB 0.9.21 runs successfully