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## Environment and Configuration
### Environment Variables
#### VCPKG_DOWNLOADS
This environment variable can be set to an existing directory to use for storing downloads instead of the internal
`downloads/` directory. It should always be set to an absolute path.
#### VCPKG_FEATURE_FLAGS
This environment variable can be set to a comma-separated list of off-by-default features in vcpkg. These features are
subject to change without notice and should be considered highly unstable.
Non-exhaustive list of off-by-default features:
- `binarycaching`
#### EDITOR
This environment variable can be set to the full path of an executable to be used for `vcpkg edit`. Please see
`vcpkg help edit` for command-specific help.
#### VCPKG_ROOT
This environment variable can be set to a directory to use as the root of the vcpkg instance. Note that mixing vcpkg
repo versions and executable versions can cause issues.
#### VCPKG_VISUAL_STUDIO_PATH
This environment variable can be set to the full path to a Visual Studio instance on the machine. This Visual Studio instance
will be used if the triplet does not override it via the [`VCPKG_VISUAL_STUDIO_PATH` triplet setting](triplets.md#VCPKG_VISUAL_STUDIO_PATH).
Example: `D:\2017`
#### VCPKG_DEFAULT_TRIPLET
This environment variable can be set to a triplet name which will be used for unqualified triplet references in command lines.
#### VCPKG_FORCE_SYSTEM_BINARIES
This environment variable, if set, suppresses the downloading of CMake and Ninja and forces the use of the system binaries.
### VCPKG_KEEP_ENV_VARS
This environment variable can be set to a list of environment variables, separated by `;`, which will be propagated to
the build environment.
Example: `FOO_SDK_DIR;BAR_SDK_DIR`
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