Installation on Ubuntu 20.04 fails

[JochenLutz]

Building native extensions. This could take a while...
ERROR: Error installing racc:
ERROR: Failed to build gem native extension.

current directory: /home/jolutz/.rvm/gems/ruby-3.0.0/gems/racc-1.6.0/ext/racc/cparse

/home/jolutz/.rvm/rubies/ruby-3.0.0/bin/ruby -I /home/jolutz/.rvm/rubies/ruby-3.0.0/lib/ruby/3.0.0 -r ./siteconf20220304-1130559-3adf2g.rb extconf.rb
checking for rb_block_call()... yes
checking for rb_ary_subseq()... yes
creating Makefile

current directory: /home/jolutz/.rvm/gems/ruby-3.0.0/gems/racc-1.6.0/ext/racc/cparse
make "DESTDIR=" clean

current directory: /home/jolutz/.rvm/gems/ruby-3.0.0/gems/racc-1.6.0/ext/racc/cparse
make "DESTDIR="
compiling cparse.c
linking shared-object racc/cparse.so

current directory: /home/jolutz/.rvm/gems/ruby-3.0.0/gems/racc-1.6.0/ext/racc/cparse
make "DESTDIR=" install
make: /usr/bin/mkdir: Command not found
make: *** [Makefile:202: .sitearchdir.-.racc.time] Error 127

make install failed, exit code 2

Gem files will remain installed in /home/jolutz/.rvm/gems/ruby-3.0.0/gems/racc-1.6.0 for inspection.
Results logged to /home/jolutz/.rvm/gems/ruby-3.0.0/extensions/x86_64-linux/3.0.0/racc-1.6.0/gem_make.out

mkdir exists in /bin.

[PiotrBracha]

You need to do one thing. Please take a look where do you have "mkdir" command:

1. Execute command "whereis mkdir" or "locate mkdir".
2. You will see some path to mkdir.
3. Then you need to create symbolic link to the mkdir inside the path which you can see in error above - /usr/bin/mkdir.
4. That's all. :)

PS
The problem is not exactly on freshly installed 20.04 but on the 18.04 upgraded to 20.04. ;)

[hsbt]

see #147 (comment)