Attempting to Install Libv8, "Failed to Build Gem Native Extension"

therubyracer - Gem::Ext::BuildError: ERROR: Failed to build gem native extension

This steps worked for me.

OS: Maverick
Ruby: 2.1.1

gem uninstall libv8
gem install therubyracer -v '0.11.3'
gem install libv8 -v '3.11.8.13' -- --with-system-v8

gem install libv8 -v '5.3.332.38.1' ... Error installing libv8: ERROR: Failed to build gem native extension

Try this (requires Homebrew):

brew install v8
gem install libv8 -- --with-system-v8

For a specific version:

gem install libv8 -v '5.3.332.38.1' -- --with-system-v8

but I'm assuming the version number would need to match whatever the Homebrew formula version of v8 is.

Can't install libv8 gem on Cygwin

Since your question mentioned Cygwin, I assume you are Windows user. Currently, there's no way to install therubyracer or libv8 in Windows as said by its maintainer: therubyracer gem on windows. Windows is not Rails land unfortunately.

If you do need libv8, you can try nodejs instead. It comes with a binary, handy for all platform.

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