Fail to build

[hcyrs]

~/works/yewtify$ cargo build
Compiling yewtify v0.0.0 (/home/xxxx/works/yewtify)
error: failed to run custom build command for yewtify v0.0.0 (/home/xxxx/works/yewtify)

Caused by:
process didn't exit successfully: /home/xxxx/works/yewtify/target/debug/build/yewtify-fe819398fe506c0c/build-script-build (exit code: 1)
--- stderr
Error: environment variable not found

[paulvt]

Yeah, build.rs uses the YEWTIFY_OUT environment variable, but this is not set for a plain cargo build.
See also: https://github.com/yewstack/yewtify/blob/master/build.rs#L13

It is set in examples/yewtify--example/run.sh but I also cannot get that to work.