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Refer to My Oracle Support note 742060.1 for the latest certification information about Oracle Instant Client and Oracle Database:
The following features or products are not supported on Apple Mac OS X:
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.
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Oracle Database Database Instant Client Release Notes, 19c for Apple macOS (Intel)
Copyright © 2015, 2023, Oracle and/or its affiliates.
Primary Author: Sunil Surabhi