EMX (programming environment)

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EMX (Eberhard Mattes eXtender; also known as emx+gcc) is a programming environment for DOS and OS/2. It allows creating and executing of 32-bit mode applications, presenting a POSIX API and, on OS/2, access to the OS/2 APIs.


The EMX package consists of:

  • The emx.exe program, a DOS extender, that allows running a 32-bit mode application in DOS and emx.dll and helper dlls in single threaded (for DOS compatibility) and multithreaded forms for running under OS/2.
  • A C library that provides a POSIX API, for use on both DOS and OS/2.
  • Additional libraries for OS/2.
  • Ports of the C and C++ compilers of GNU GCC, the GNU binutils, gdb, GNU make, and other tools for program development.
  • Tools for creating OS/2 shared libraries.


The latest version is emx 0.9d, released in 1998 and last updated in March 2001.

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