报错解决：Could not find a package configuration file provided by “Pangolin“以及一系列问题

博主在使用cmake编译自己的工程时，遇到了如下报错：

CMake Error at CMakeLists.txt:5 (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

  Add the installation prefix of "Pangolin" to CMAKE_PREFIX_PATH or set
  "Pangolin_DIR" to a directory containing one of the above files.  If
  "Pangolin" provides a separate development package or SDK, be sure it has
  been installed.

-- Configuring incomplete, errors occurred!

解决方法是安装Pangolin软件包：

# 下载Pangolin
git https://github.com/stevenlovegrove/Pangolin.git
# 编译
cd Pangolin
mkdir build
cd build 
cmake .. && make
sudo make install
# 注意sudo make install一定要执行，否则编译自己的工程会报错fatal error: pangolin/pangolin.h: 没有那个文件或目录

在编译Pangolin时发现GLEW软件包未安装：

CMake Error at cmake/FindGLEW.cmake:51 (MESSAGE):
  Could not find GLEW

使用如下命令进行安装：

sudo apt install libglew-dev

安装完后，重新对Pangolin进行编译，成功编译与安装。

但编译自己的工程又遇到了如下的报错（报错只截取了一部分）：

In file included from /usr/local/include/pangolin/utils/signal_slot.h:3,
                 from /usr/local/include/pangolin/windowing/window.h:35,
                 from /usr/local/include/pangolin/display/display.h:34,
                 from /usr/local/include/pangolin/pangolin.h:38,
                 from /home/a616708946/slambook/ch5/code/disparity.cpp:8:
/usr/local/include/sigslot/signal.hpp:109:79: error: ‘decay_t’ is not a member of ‘std’; did you mean ‘decay’?
  109 | constexpr bool is_weak_ptr_compatible_v = detail::is_weak_ptr_compatible<std::decay_t<P>>::value;
      |                                                                               ^~~~~~~
      |                                                                               decay

解决方法是把CMakeLists.txt中的这一部分进行修改，修改完如下：

set( CMAKE_CXX_FLAGS "-std=c++14")
# set(CMAKE_CXX_FLAGS "-std=c++11 -g -Wall")

接着，编译自己的工程又遇到了如下的报错（报错只截取了一部分）：

In file included from /usr/local/include/pangolin/gl/gl.h:324:0,
                 from /usr/local/include/pangolin/handler/handler.h:31,
                 from /usr/local/include/pangolin/display/widgets.h:32,
                 from /usr/local/include/pangolin/pangolin.h:40,
                 from /home/marcos/code/SensorsCalibration/lidar2camera/manual_calib/src/run_lidar2camera.cpp:9:
/usr/local/include/pangolin/gl/gl.hpp: In member function ‘void pangolin::GlTexture::CopyFrom(const pangolin::GlTexture&)’:
/usr/local/include/pangolin/gl/gl.hpp:348:5: error: ‘glCopyImageSubDataNV’ was not declared in this scope
     glCopyImageSubDataNV(tex.tid, GL_TEXTURE_2D, 0, 0, 0, 0,
     ^~~~~~~~~~~~~~~~~~~~
/usr/local/include/pangolin/gl/gl.hpp:348:5: note: suggested alternative: ‘glCopyColorSubTable’
     glCopyImageSubDataNV(tex.tid, GL_TEXTURE_2D, 0, 0, 0, 0,
     ^~~~~~~~~~~~~~~~~~~~
     glCopyColorSubTable

Pangolin安装的版本有误，解决方法如下：

cd Pangolin
cd build 
sudo make uninstall
cd .. && rm -rf build
git checkout v0.6
mkdir build && cd build
cmake ..
cmake --build .
sudo make install

最后编译自己的工程成功，问题成功解决。