The Oric SDK is a complete cross-development system allowing the creation of software for the Oric range of computers.
The official project home page is https://www.osdk.org and contains the official binary releases, documentation, and articles about how to use the system.
This OSDN.NET project is specifically for the hosting of the Subversion repository used to develop and update the software.
The SDK provide the following components:
Components to build programs:
and finally comes with emulators and debuggers to test the projects
Added native support for Oric Joystick interfaces to the OSDK, with full library support and some sample C code.
EDIT: I reuploaded a minor update because a typo in header.s (found by ISS), the define in question is not used, so it's not really an issue, but if you have the version with MD5 de632107aa320f6cb0973964942f2389 you can fetch the new version with MD5 ca3fc82895a9d78eec6b388b95a06b0c where the issue is fixed.