Merge pull request #34 from bsilver8192/fix-macro-redefinition

Fix redefinition of _XOPEN_SOURCE.

diff --cc AUTHORS
index 769d44a3840166669588f27eaad89a576c226b44,c68cc9808e89d403e9b55d7a7ed6a404a8674518..3adbe3a4fbaabbb89430989f3792c80d4658421e
--- 1/AUTHORS
--- 2/AUTHORS
+++ b/AUTHORS
@@@ -9,8 -9,5 +9,9 @@@
  # Please keep the list sorted.
  
  Abhishek Parmar <abhishek@orng.net>
+ Brian Silverman <bsilver16384@gmail.com>
  Google Inc.
 +Michael Tanner <michael@tannertaxpro.com>
 +romange <romange@users.noreply.github.com>
 +Sergiu Dotenco <sergiu.dotenco@th-nuernberg.de>
 +tbennun <tbennun@gmail.com>

diff --cc CONTRIBUTORS
Simple merge