meson/docs/markdown/snippets/customtarget_env.md

custom_target() now accepts an env keyword argument

Environment variables can now be passed to the custom_target() command.

env = environment()
env.append('PATH', '/foo')
custom_target(..., env: env)
custom_target(..., env: {'MY_ENV': 'value'})
custom_target(..., env: ['MY_ENV=value'])