forked form https://github.com/stevenlovegrove/Pangolin git clone https://github.com/stevenlovegrove/Pangolin cd Pangolin git checkout tags/v0.5 and then fix the compiling issues for ORBSLAM2 with ubuntu20.04 by consulting following blogs: https://blog.csdn.net/Robert_Q/article/details/121690089 https://github.com/stevenlovegrove/Pangolin/pull/318/files?diff=split&w=0#diff-5354000752b8d047b1fd9bad374d87cb24a12adb19eb87e561338df8844b6e16