vcpkg/docs/maintainers/vcpkg_fail_port_install.md

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# vcpkg_fail_port_install
The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/maintainers/vcpkg_fail_port_install.md).
Checks common requirements and fails the current portfile with a (default) error message
## Usage
```cmake
vcpkg_fail_port_install(
[ALWAYS]
[MESSAGE <"Reason for failure">]
[ON_TARGET <Windows> [<OSX> ...]]
[ON_ARCH <x64> [<arm> ...]]
[ON_CRT_LINKAGE <static> [<dynamic> ...]])
[ON_LIBRARY_LINKAGE <static> [<dynamic> ...]]
)
```
## Parameters
### MESSAGE
Additional failure message. If none is given, a default message will be displayed depending on the failure condition.
### ALWAYS
Will always fail early
### ON_TARGET
Targets for which the build should fail early. Valid targets are `<target>` from `VCPKG_IS_TARGET_<target>` (see `vcpkg_common_definitions.cmake`).
### ON_ARCH
Architecture for which the build should fail early.
### ON_CRT_LINKAGE
CRT linkage for which the build should fail early.
### ON_LIBRARY_LINKAGE
Library linkage for which the build should fail early.
## Examples
* [aws-lambda-cpp](https://github.com/Microsoft/vcpkg/blob/master/ports/aws-lambda-cpp/portfile.cmake)
## Source
[scripts/cmake/vcpkg\_fail\_port\_install.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_fail_port_install.cmake)