Jekyll Gem Install Error Fix

In this tutorial, you'll learn about Jekyll Gem Install Error Fix. We cover key concepts, practical examples, and best practices.

The Problem

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /usr/lib/ruby/gems/3.0.0 directory.

Installing Jekyll gems system-wide without sudo causes permission errors.

Wrong

gem install jekyll

Output:

ERROR:  While executing gem ... (Gem::FilePermissionError)

Right

Install to your user directory:

gem install --user-install jekyll

Or use Bundler with a local path:

mkdir -p ~/my-site && cd ~/my-site
bundle init
echo 'gem "jekyll"' >> Gemfile
bundle install --path vendor/bundle

Output:

Bundle complete! 1 Gemfile dependency, 5 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.

Prevention

• Always use --user-install when installing gems without sudo
• Prefer Bundler for project-specific gem management
• Add export PATH="$HOME/.gem/ruby/3.0.0/bin:$PATH" to your .bashrc

Common Mistakes with gem install

1. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
2. Non-exhaustive pattern matches that compile with warnings then crash at runtime
3. Misunderstanding that String is [Char] with poor performance for large text operations

These mistakes appear frequently in real-world JEKYLL code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ