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mktemp can be either:

1. The command line function /usr/bin/mktemp
2. A library function callable from a C program.

Run man 1 mktemp to get the documentation for the command line function, and run man 3 mktemp to get the documentation for the library function.

By the way: openssl version 097 as old (10 years or so) and has several security issues.

mktemp can be either:

1. The command line function /usr/bin/mktemp
2. A library function callable from a C program.

The command line function is part of standard linux distribution, and the library function is part of the standard C library, and therefore always included in a linux distribution.

Run man 1 mktemp to get the documentation for the command line function, and run man 3 mktemp to get the documentation for the library function.

By the way: openssl version 097 as old (10 years or so) and has several security issues.