Example showing ExternalProject_Add for DocOpt

DocOpt.cmake

include(ExternalProject)

# Set default ExternalProject root directory
set_directory_properties(PROPERTIES EP_PREFIX "${CMAKE_BINARY_DIR}/Third Party")

set(InstallPath "${CMAKE_BINARY_DIR}/Installed Dependencies")

# Add DocOpt
ExternalProject_Add(
    DocOpt
    GIT_REPOSITORY git@github.com:docopt/docopt.cpp.git
    TIMEOUT 30
    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${InstallPath} -DCMAKE_DEBUG_POSTFIX=d
    # Wrap download, configure and build steps in a script to log output
    LOG_DOWNLOAD ON
    LOG_CONFIGURE ON
    LOG_BUILD ON
    LOG_INSTALL ON)

# Specify include dir
set(DocOptInclude ${InstallPath}/include/docopt PARENT_SCOPE)

# Specify libs
if(MSVC)
  set(Suffix ".lib")
else()
  set(Suffix ".a")
endif()
set(DocOptLib
    debug ${InstallPath}/lib/${CMAKE_FIND_LIBRARY_PREFIXES}docopt_sd${Suffix}
    optimized ${InstallPath}/lib/${CMAKE_FIND_LIBRARY_PREFIXES}docopt_s${Suffix}
    PARENT_SCOPE)