an error when running command ./build.sh about orb_slam2 HOT 5 OPEN

Yes, see #1015
Pangolin is currently using a higher version c++ compiler while ORB-SLAM2 uses the older version.
Try remove Pangolin and git clone -b v0.5 https://github.com/stevenlovegrove/Pangolin.git then cmake again

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The same error came for me. One wayout is to delete the build folder and build again:
mkdir build
cd build
cmake ..
make

This worked for me after ./buid.sh gave error

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my error while running build.sh is

-- Configuring incomplete, errors occurred!
See also "/home/mariah/trial_ws/src/ORB_SLAM2/build/CMakeFiles/CMakeOutput.log".
make: *** No targets specified and no makefile found. Stop.

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I tried both ./build.sh and @alam121 approaches but both resulted to this error:

/home/irsyad2/Pangolin/components/pango_core/include/sigslot/signal.hpp:109:79: error: ‘decay_t’ is not a member of ‘std’; did you mean ‘decay’?
  109 | _weak_ptr_compatible_v = detail::is_weak_ptr_compatible<std::decay_t<P>>::value;
         |                                                              ^~~~~~~
         |                                                              decay

I built Pangolin from stevenlovegrove's repository at my home directory, master branch. Help please?

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@irsyadtc Any updates on the issue? I am facing the same error.

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