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## Dependency objects now have a get_variable method
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This is a generic replacement for type specific variable getters such as
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`ConfigToolDependency.get_configtool_variable` and
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`PkgConfigDependency.get_pkgconfig_variable`, and is the only way to query
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such variables from cmake dependencies.
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This method allows you to get variables without knowing the kind of
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dependency you have.
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```meson
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dep = dependency('could_be_cmake_or_pkgconfig')
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# cmake returns 'YES', pkg-config returns 'ON'
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if ['YES', 'ON'].contains(dep.get_variable(pkg-config : 'var-name', cmake : 'COP_VAR_NAME', default_value : 'NO'))
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error('Cannot build your project when dep is built with var-name support')
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endif
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```
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