Created attachment 216486 [details]
Patch against r486761
Kodi 18.7.1 has been committed and has slightly different cmake include paths than the previous version (17.6).
The attached patch should address the issue.
A commit references this bug:
Date: Fri Jul 17 06:25:03 UTC 2020
New revision: 542408
devel/kodi-platform: Fix after multimedia/kodi update
Submitted by: James French <firstname.lastname@example.org>