cmake find_path(),windows带空格的路径

cmake中的windows 路径如果有空格，比如D:/Program Files/libigl, 需要改成D:/Program\ Files/libigl

find_path(LIBIGL_INCLUDE_DIR igl/readOBJ.h
    HINTS
        ENV LIBIGL
        ENV LIBIGLROOT
        ENV LIBIGL_ROOT
        ENV LIBIGL_DIR
    PATHS
        ${CMAKE_SOURCE_DIR}/../..
        ${CMAKE_SOURCE_DIR}/..
        ${CMAKE_SOURCE_DIR}
        ${CMAKE_SOURCE_DIR}/libigl
        ${CMAKE_SOURCE_DIR}/../libigl
        ${CMAKE_SOURCE_DIR}/../../libigl
        D:/Program\ Files/libigl
        /usr
        /usr/local
        /usr/local/igl/libigl
    PATH_SUFFIXES include
)