Khái quát
Nếu như lỗi như sau xuất hiện khi chúng ta cài đặt gem mysql2:
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/home/deploy/.rbenv/versions/3.2.0/lib/ruby/3.2.0/mkmf.rb:1083:in `block in find_library': undefined method `split' for nil:NilClass (NoMethodError)
paths = paths.flat_map {|path| path.split(File::PATH_SEPARATOR)}
^^^^^^
from /home/deploy/.rbenv/versions/3.2.0/lib/ruby/3.2.0/mkmf.rb:1083:in `each'
from /home/deploy/.rbenv/versions/3.2.0/lib/ruby/3.2.0/mkmf.rb:1083:in `flat_map'
from /home/deploy/.rbenv/versions/3.2.0/lib/ruby/3.2.0/mkmf.rb:1083:in `find_library'
from extconf.rb:103:in `<main>'
Cách khắc phục
Cách khắc phục là cài đặt libmysqlclient-dev bằng cách:
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sudo apt install libmysqlclient-dev
