mpv fails to build with error of various swift errors

[xanadu6291]

mpv version and platform

mpv version : commit 8b114e5

platform : macOS 10.14.4

Reproduction steps

cd ${CMPL}/mpv
git pull
./waf clean
./waf configure --prefix=${TARGET} --disable-debug-build --disable-manpage-build CC=/usr/bin/gcc AR=/usr/bin/ar
./waf build

Then build fails

Expected behavior

Build mpv successfully

Actual behavior

Build fails

Log file

Below is the log of ./waf build command:
https://0x0.st/zZSp.txt

Sample files

There's no sample file

[j605]

Duplicate of #6614 which was also a duplicate. Search the issue tracker before posting the same issue over and over.

[Akemi]

downgrade your xcode for now.