Compilation failure on Haiku

[khallebal]

Hi, thanks for the great player.
I am using Qt5-5.11.2 and gcc-7.3.0, after building ffmpeg and libchardet succesfully, ./configure goes fine( i added Haiku as a supported platform) the mpv build also goes fine, but then i get the following:

-parser/http_parser.o http-parser/http_parser.c
cc1: error: one or more PCH files were found, but they were invalid
cc1: error: use -Winvalid-pch for more information

Why am i getting this error?
How do i fix this?
thanks for any help.