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Install Composer In Gentoo

By Arch Brooks on May 26, 2026 in Programming

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Install Composer on Gentoo Linux:

sudo emerge --ask dev-php/composer

Verify:

composer --version

If the package is keyword masked on your system:

echo "dev-php/composer ~amd64" | sudo tee -a /etc/portage/package.accept_keywords/composer
sudo emerge --ask dev-php/composer

If PHP CLI is not installed first:

sudo emerge --ask dev-lang/php

Common Composer dependencies/use flags:

sudo emerge --ask dev-lang/php \
    dev-php/mbstring \
    dev-php/json

Check PHP:

php -v

Check Composer:

composer diagnose

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