Catch/docs/build-systems.md

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# Integration with build systems
## CMake
You can use the following CMake script to automatically fetch Catch from github and configure it as an external project:
```CMake
cmake_minimum_required(VERSION 2.8.8)
project(catch_builder CXX)
include(ExternalProject)
ExternalProject_Add(
catch
PREFIX ${CMAKE_BINARY_DIR}/catch
GIT_REPOSITORY https://github.com/philsquared/Catch.git
TIMEOUT 10
UPDATE_COMMAND ${GIT_EXECUTABLE} pull
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
INSTALL_COMMAND ""
LOG_DOWNLOAD ON
)
# Expose required variable (CATCH_INCLUDE_DIR) to parent scope
ExternalProject_Get_Property(catch source_dir)
set(CATCH_INCLUDE_DIR ${source_dir}/include CACHE INTERNAL "Path to include folder for Catch")
```
If you put it in, e.g., `${PROJECT_SRC_DIR}/${EXT_PROJECTS_DIR}/catch/`, you can use it in your project by adding the following to your root CMake file:
```CMake
# Includes Catch in the project:
add_subdirectory(${EXT_PROJECTS_DIR}/catch)
include_directories(${CATCH_INCLUDE_DIR} ${COMMON_INCLUDES})
enable_testing(true) # Enables unit-testing.
```