libsodium mess

[Hal Murray]

Eric: Please please please send a message to devel when you make a change 
like this.

waf errors out when it can't find sodium.h even if you haven't configured 
with --enable-crypto

NetBSD puts sodium.h in /usr/pkg/include/
FreeBSD puts it in /usr/local/include/
(In case it isn't obvious, waf doesn't look there.)


Fedora needs libsodium-devel to build

INSTALL says:
     Debian: libsodium

apt-get install on my debian box says:
  E: Unable to locate package libsodium

INSTALL says:
   CentOS: libsodium in the epel ("Extra Packages for Enterprise Linux") repo.
   Ubuntu 14.04 LTS: and older: https://gist.github.com/jonathanpmartins/2510f
38abee1e65c6d92

I think we need a few more words and/or a URL with details.  With that hint, 
I can probably figure it out if google cooperates.



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