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johngerome/Fix mkmf.rb can't find header files <ruby.h path>

Last active April 21, 2023 19:40
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Fix mkmf.rb can't find header files <ruby.h path>
```
ERROR: Error installing compass:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.1.0/gems/ffi-1.9.10/ext/ffi_c
/usr/bin/ruby2.1 -r ./siteconf20151118-18985-1l1bsx7.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
extconf failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.1.0/gems/ffi-1.9.10 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/ffi-1.9.10/gem_make.out
```
To Fix
`sudo apt-get install ruby2.1-dev` for 2.1.
@puzzle29
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Thank you very much

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