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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Support has been added for 64-bit file I/O and 32 bit UID and GIDs. Networking problems and problems with malloc of large objects have been fixed. There is improved signal handling, and many other bugfixes.
