Directives apply variable values to a specific subset of build targets. Append __<directive> to any variable or array name.

All variables and arrays support directives, including user-defined ones.

When multiple directives match, the most specific one wins:

A variable without a directive has priority 0 and is used as the default.

Use <distro>_<codename> for release-specific values:

pkgdesc="My application"
pkgdesc__ubuntu="My application for Ubuntu"
pkgdesc__ubuntu_noble="My application for Ubuntu Noble"

depends=(
  'libssl'
)
depends__apt=(
  'libssl-dev'
)
depends__yum=(
  'openssl-devel'
)

makedepends__alpine=(
  'build-base'
)
makedepends__apt=(
  'build-essential'
)