Private files aren't meant to be installed. They're in the 8.5 package mostly for historical reasons or older ports.Instead of using MODULES you could try setting BUILD_DEPENDS for 8.5 and WANTLIB and RUN_DEPENDS for 8.6.Something like that, maybe other vars as well.
Stu
    On Friday, September 20, 2024 at 04:41:12 a.m. EDT, Stuart Henderson <stu@spacehopper.org> wrote:  
 
 On 2024/09/19 17:12, Stuart Cassoff wrote:
> Depending on the software it may be possible to build against 8.5 and load into/run with 8.6.

Is there a difference between 8.5 and 8.6 regarding whether it's ok to
include private headers in the package?