This document contains important information that was not included in the platform-specific or product-specific documentation for this release.

This document supplements Oracle Database Release Notes.

This document may be updated after it is released. You can check for updates to this document and view other Oracle Database documentation at

This document contains the following topics:

Certification Information

Refer to My Oracle Support note 742060.1 for the latest certification information about Oracle Instant Client and Oracle Database:

Unsupported Products

The following features or products are not supported on Apple Mac OS X:


  • Pro*COBOL

Other Known Issues

The following section contains information about the issue related to Oracle Database Instant Client 19c:

Pro*C Does Not Support C99 Headers

The Pro*C parser fails to recognize C99 syntax in system headers on the supported Apple Mac OS X releases.

This issue has no workaround.

This issue is tracked with Oracle bug 16061064.

Documentation Accessibility

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Access to Oracle Support

Oracle customers that have purchased support have access to electronic support through My Oracle Support. For information, visit or visit if you are hearing impaired.