编译错误，找不到Pangolin

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下面是报错：

CMake Error at CMakeLists.txt:31 (find_package):
By not providing "FindPangolin.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Pangolin",
but CMake did not find one.

Could not find a package configuration file provided by "Pangolin" with any
of the following names:
PangolinConfig.cmake
pangolin-config.cmake

系统ubuntu20.04+ros1
我看了thirdparty这个文件夹里build-pangolin和Pangolin都是有东西的，看起来正常。在CmakeList.txt文件：
set(PANGOLIN_DIR "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/build-pangolin")
这一句也设了路径不知道为啥还找不到find_package(Pangolin REQUIRED)

set(PANGOLIN_DIR "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/build-pangolin")这句换成绝对路径也不行

无奈之下，直接cmake编译和安装Pangolin源码，这样才行。