CMake/Tests/FindPackageModeMakefileTest/FindFoo.cmake.in

find_library(FOO_LIBRARY NAMES foo HINTS "@CMAKE_CURRENT_BINARY_DIR@" )
find_path(FOO_INCLUDE_DIR NAMES foo.h HINTS "@CMAKE_CURRENT_SOURCE_DIR@" )

set(FOO_LIBRARIES ${FOO_LIBRARY})
set(FOO_INCLUDE_DIRS "${FOO_INCLUDE_DIR}"  "/some/path/with a space/include" )

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Foo  DEFAULT_MSG  FOO_LIBRARY FOO_INCLUDE_DIR )