[lcsoft]

you can recommend a cross-platform C library for the accessibility support.

[avhon1]

Not C per se, but FreePascal's LCL library has native accessibility support [1], and there are plenty of examples showing how to mix Pascal and C [2].

[1]: http://wiki.freepascal.org/LCL_Accessibility [2]: https://github.com/williamhunter/pascal-bindings-for-c