The product supports four languages (C, C++, Objective C and Java) and

The product supports four languages (C, C++, Objective C and Java) and
provides Mac developers with the ability to build both Mac OS X and
Classic Mac OS applications utilizing Carbon, Cocoa, Java and Classic
Mac OS technologies.

Related: [10 Gold][1] [11 Academic Gold][2] [Pro 1][3] [Pro 2][4] [Pro
3][5] [Pro 4][6] [Pro 5][7] [Pro 6][8] [Pro 7][9] [Pro 9 for Palm][10]
[Dev Studio 9][11] [Dev Studio 10][12]

Compatibility
Architecture: PPC (Carbonized)

PPC G3 or greater
Mac OS 9.1/Mac OS X 10.1.3
(May run on older with an upgraded CarbonLib)
64 MB RAM (Mac OS 9), 128 MB RAM (Mac OS X)
700 MB disk space for full installation

Note: For some reason it's possible for the precompiled headers to be
out of date, though I'm not clear on why.
According to CodeWarrior Help's guidance, under C/C++ Error 10123, the
fix for this on Metrowerks-provided header files is to rebuild their
associated precompiled header projects.
In my case, opening up `Metrowerks CodeWarrior:MacOS
Support:MacHeaders:MacHeaders.mcp` and Making it (Command-M) will fix
the build of a Macintosh Toolbox project with the default stationery.

[1]: http://macintoshgarden.org/apps/codewarrior-10-gold
[2]: http://macintoshgarden.org/apps/codewarrior-11-academic-gold
[3]: http://macintoshgarden.org/apps/codewarrior-professional-release-1
[4]: http://macintoshgarden.org/apps/codewarrior-pro-2
[5]: http://macintoshgarden.org/apps/codewarrior-pro-3
[6]: http://macintoshgarden.org/apps/codewarrior-pro-4
[7]: http://macintoshgarden.org/apps/codewarrior-pro-5
[8]: http://macintoshgarden.org/apps/codewarrior-6
[9]: http://macintoshgarden.org/apps/codewarrior-pro-71
[10]: http://macintoshgarden.org/apps/codewarrior-pro-9x-palm-os
[11]: http://macintoshgarden.org/apps/codewarrior-development-studio-v9
[12]: http://macintoshgarden.org/apps/codewarrior-development-studio-10