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README.cygwin - Parrot under Cygwin


Parrot builds out of the box under Cygwin, when no other parrot is installed. See below at PROBLEMS.

There are official cygwin parrot packages available via

  parrot libparrot0 libparrot-devel parrot-perl6 parrot-languages

Some tweaks are needed for different names for the ffi to some dll's. See "loadlib DLL versioning".


You'll need the following Cygwin packages to run and build Parrot by your own.

Runtime requirements:

  libreadline6 ncurses libintl8 libgmp3

Optional requirements:

  libicu38 libpq5

  for opengl: w32api opengl or libglut3 xorg-x11-base xorg-x11-bin-dlls

Build requirements:

  gcc make perl parrot readline libncurses-devel libgmp-devel

Optional build requirements:


  for Cygwin/X opengl: freeglut libglut-devel xorg-x11-devel

Optional perl packages for testing:

  L<Test::TAP::HTMLMatrix> if you want to run the smoke tests
  with C<make smoke>.

  perl L<Test::Perl::Critic> and L<Perl::Critic>
Cygwin subversion and perl

If you use SVN to get a copy of Parrot, you should use the Cygwin SVN and not the TortoiseSVN client to avoid build errors. Similarly you will need Cygwin Perl rather than ActiveState or Strawberry Perl.


Note that ICU is now optional, you can build Parrot without it, by not installing it or asking Parrot to ignore it (--without-icu).


Building is tricky:

If the freeglut package for the X Server is installed, this is used, otherwise the w32api and opengl packages for native Windows opengl support are tried.

In order to use the w32api native GLUT there must be no /usr/include/GL directory.

The problem is that the NCI tries the header files to create the imports and not the libraries, and if the /usr/include/GL headers are found these are used, despite the w32api GLUT libraries are defined.

  Determining if your platform supports OpenGL.............yes, freeglut 3.4.
  Determining if your platform supports OpenGL...................yes, GLUT 3.
  Determining if your platform supports

Required packages:

  libglut-devel libGL-devel libGLU-devel libglut3 ...

or if libglut-devel and libGL-devel is not installed:

  w32api opengl

SDL references cygSDL-1-2-0.dll, which is only in cygports


libaio-devel "Linux-native asynchronous I/O access" is not available for cygwin, and as the name says it will never be :)


  make test
  make install


perl fatal error - unable to remap Glob.dll

Something like: perl.exe: *** fatal error - unable to remap C:\cygwin\lib\perl5\5.10\i686-cygwin\auto\File\Glob\Glob.dll to same address as parent(0x860000) != 0x14D0000

This is a known cygwin problem with dll's, esp. perl on non-XP 32bit platforms. You need to install the rebase package and run rebaseall from an ash shell.

Crash at miniparrot.exe config_lib.pasm

Invoking Parrot to generate runtime/parrot/include/config.fpmc --cross your fingers

  F<./miniparrot.exe config_lib.pasm > runtime/parrot/include/config.fpmc>

See below.

Spurious stackdumps while building

Be sure that there's no other libparrot.dll.a or libparrot.a in the linker libpath.

/usr/lib/libparrot.dll.a, /usr/local/lib/libparrot.dll.a

os hardlink test fail
  #   Failed test 'hard link was really created'
  #   at t/pmc/os.t line 312.

This is a known Windows limitation with NTFS junctions on files.


loadlib DLL versioning

Use cyg*-1.1.dll naming conventions instead of lib*.so.1.1 names for loadlib, the FFI.

Thanks to the Windows DLL Hell and the impossibility of file hardlinks, windows dll names are versioned, so the loadlib function or the various pir's needs more logic.

Either add the version to each loadlib call, and stem the version from POSIX versions within get_path(), or add an optional version argument to loadlib for win32. Or just fix all the pir's, which will be easier when exceptions work again.


Threads, Events, and Signals are missing.


Reini Urban <>




Last updated: 23 January 2009

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