curl -OL https://raw.github.com/nvie/gitflow/develop/contrib/gitflow-installer.sh
$ chmod +x gitflow-installer.sh
$ sudo ./gitflow-installer.sh

http://mirrors.kernel.org/sources.redhat.com/cygwinports/ https://sourceware.org/cygwinports/

New, simplified installation instructions:

Use the latest Cygwin installers (at least version 2.850): setup-x86.exe for 32-bit, or setup-x86_64.exe for 64-bit. (Note that many packages have not yet been ported to x86_64.) Launch setup-*.exe with the -K flag, e.g.: cygstart -- /path/to/setup-x86.exe -K http://cygwinports.org/ports.gpg On Choose Installation Type page, select "Install from Internet". On Choose Download Site(s) page, select a distro mirror, then enter ftp://ftp.cygwinports.org/pub/cygwinports in the User URL field and press Add (making sure that both are highlighted). Alternatively, you can use a sourceware mirror of your choice for better download speeds. Proceed with package selection and installation, making sure to install any indicated dependencies.