ERROR: Error installing ffi: ERROR: Failed to build gem native extension

Question

Got the DevKit installed and re-ran the ffi install….got this as an output:

C:\\Documents and Settings\\******>gem install ffi
Temporarily enhancing PATH          


        

Answer 1

you need this,

apt-get install ruby2.2-dev

Answer 2

The gem install ffi fails due to the gem trying to build a bundled copy of libffi, which does not work due to assumptions that /usr/bin/env exists and too old libffi copy.

However, you can build the ffi gem against the system libffi - install the packages:

apt install clang make ruby-dev libffi-dev

After that the ffi gem should build:

gem install ffi

Answer 3

sudo apt-get install libffi-dev

This worked for me

Answer 4

Copied from another post:

As stated in Issue with installing ImageMagick and rmagick on Mountain Lion, ffi appears to be configured to look for 'gcc-4.2', so once I updated my Apple command line tools (which I may or may not have needed to do), I created a symbolic link to make the ffi install configuration happy:

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

Answer 5

Version 1.0.10 has issues compiling on windows.

You can use the 1.0.9

gem install ffi --version='1.0.9'

Answer 6

For me the fix was running in this order. I'm not sure what all was relevant, but it worked:

gem install ffi --version '1.0.9'

The above failed, but then I could successfully run:

gem install bundler

...and subsequently:

gem install ffi

...which got the latest version (1.6.0 at the time of writing this) and installed it successfully.