Wireshark 3.4.0: build failure on older MacOS releases, due to 'CLOCK_REALTIME'

Summary

The MacPorts project builds Wireshark3 for a large swath of MacOS releases, from Big Sur all the way back to 10.6. And we've encountered build failures on MacOS releases prior to 10.12, involving the use of CLOCK_REALTIME.

Note that CLOCK_REALTIME isn't available in those older MacOS releases. However, there is a simple workaround; see patch, below.

Steps to reproduce

Build on any MacOS release earlier than 10.12.

What is the current bug behavior?

Build fails on file ui/qt/import_text_dialog.cpp, with the following error:

wireshark-3.4.0/ui/qt/import_text_dialog.cpp:388:27: error: use of undeclared identifier 'CLOCK_REALTIME'
    clock_gettime(CLOCK_REALTIME, &timenow); /* supported by Linux and MacOS */

What is the expected correct behavior?

Build should succeed. Proposed fix is attached, as a unified diff patch.

wireshark3-patch-fix-clock_realtime.diff

Sample capture file

Not Applicable

Relevant logs and/or screenshots

Not Applicable

Build information

Not Applicable