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Merge pull request #533 from srse/gentoo_hint_for_readme

Updated README.md
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2 parents d73b7ba + f6b5894 commit cd1ea5c3cbfe7a433098064a755a47dee039731c @tduehr tduehr committed on GitHub Nov 11, 2016
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@@ -43,6 +43,8 @@ At a minimum, you will need:
* A C compiler (e.g. Xcode on OSX, gcc on everything else)
* libffi development library - this is commonly in the libffi-dev or libffi-devel
+On Linux systems running with [PaX](https://en.wikipedia.org/wiki/PaX) (Gentoo, Alpine, etc.) FFI may trigger `mprotrect` errors. You may need to disable [mprotect](https://en.wikibooks.org/wiki/Grsecurity/Appendix/Grsecurity_and_PaX_Configuration_Options#Restrict_mprotect.28.29) for ruby (`paxctl -m [/path/to/ruby]`) for the time being until a solution is found.
+
## Installation
From rubygems:

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