FreeSWITCH cannot find libks2.h when libstirshaken/libstirshaken-dev are installed

[thehunmonkgroup]

Describe the bug

FreeSWITCH cannot find libks2 header when libstirshaken/libstirshaken-dev are installed.

FreeSWITCH builds fine when these are not installed.

To Reproduce

• Install libstirshaken1 and libstirshaken-dev
• Try to build latest release of FreeSWITCH from source (1.10.11 a time of writing)
• Build of mod_sofia fails with an error that it cannot find libks2.h
• Adding export CFLAGS="-I/usr/include/libks2" prior to building solves the issue, but it's weird this is necessary

Expected behavior

FreeSWITCH should build with libstirshaken support, without having to add any extra CFLAGS.

Package version or git hash

FreeSWITCH Version 1.10.11-release+git~20231222T180831Z~f24064f7c9~64bit