Installing and Updating Cygwin for 64-bit versions of Windows. Run setup-x86_64.exe any time you want to update or install a Cygwin package for 64-bit windows. The signature for setup-x86_64.exe can be used to verify the validity of this binary using the public key here. General installation notes

Cygwin version. The most recent version of the Cygwin DLL is 3.5.4. The Cygwin DLL currently works with all recent, commercially released x86_64 versions of Windows, starting with Windows 8.1. For more information see the FAQ. Note to users of older Windows versions

To install the Cygwin net release, go to https://cygwin.com/ and run setup-x86_64.exe to install the 64 bit version of Cygwin. This will download a GUI installer which can be run to download a complete cygwin installation via the internet.

Cygwin User’s Guide iii Contents 1 Cygwin Overview 1 1.1 What is it ...

Cygwin has a nice setup program that downloads and installs the necessary Cygwin packages for you. Open the Cygwin home page in your web browser. Click on the setup-x86_64.exe link to download the setup program.

Cygwin User's Guide. The Cygwin User's Guide is now available in several formats: Several HTML files, with Table of Contents; One large compressed HTML file; One PDF file; Alternatively, you may jump to a section that interests you: Quick Start Guide for those more experienced with Windows; Quick Start Guide for those more experienced with UNIX

What do I have to look out for when porting applications to 64 bit Cygwin? The Cygwin x86_64 toolchain is using the LP64 data model. That means, in contrast to Windows, which uses an LLP64 data model, sizeof(long) != sizeof(int), just as on Linux. For comparison:

The Cygwin DLL works with all AMD64 versions of Windows NT since Windows Vista/Server 2008. The API follows the Single Unix Specification as much as possible, and then Linux practice. The major differences between Cygwin and Linux is the C library ( newlib instead of glibc ).

Cygwin/X is a port of the X Window System to the Cygwin API layer for the Microsoft Windows family of operating systems. Cygwin provides a UNIX-like API, thereby minimizing the amount of porting required.

Building applications for 64 bit Cygwin The 64 bit Cygwin toolchain uses the Microsoft x64 calling convention by default, so you can create applications using the Win32 API just as with the 32 bit Cygwin toolchain.