Cygwin is a DLL which provides a Unix emulation environment for Windows. The Cygwin environment provides a complete port of such development utilities as gcc, binutils, gdb, make, etc., as well as a vast number of useful utilities.
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This release works much better on Vista and Windows 7.
It has improvements in international character set handling. It handles path names longer than 260 characters. It has support for IPv6. It allows multiple Cygwin installations to exist on the same machine. It breaks backwards compatibility with some older applications. It no longer works on Windows 9x class systems.
