New issue by xplshn on void-packages repository

https://github.com/void-linux/void-packages/issues/45688

Description:
### Is this a new report?

Yes

### System Info

Void 6.3.13_1 x86_64 musl

### Package(s) Affected

River

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

_No response_

### Expected behaviour

The package should not error

### Actual behaviour

Package errors at do_build() line 31

### Steps to reproduce

Xbps-src -o ~xwayland pkg river