(In reply to Arvin Schnell from comment #1) > The include path -I/usr/include/ruby-2.6.0 must be reported by ruby itself > since it is not included in the sources. I think that part already fixed itself: [ 358s] swig -o storage_wrap.cxx -c++ -ruby -autorename -I../.. -I/usr/include/ruby-2.7.0 -I/usr/include/ruby-2.7.0/x86_64-linux-gnu storage-ruby.i