Merge pull request #28 from dcci/env

Don't assume python is in /usr/bin. Use 'env' instead.
diff --git a/XCTest/XCTestMain.swift b/XCTest/XCTestMain.swift
index 4339560..9efa884 100644
--- a/XCTest/XCTestMain.swift
+++ b/XCTest/XCTestMain.swift
@@ -12,7 +12,7 @@
 //  for running tests and some infrastructure for running them.
 //
 
-#if os(Linux)
+#if os(Linux) || os(FreeBSD)
 import Glibc
 #else
 import Darwin
diff --git a/XCTest/XCTimeUtilities.swift b/XCTest/XCTimeUtilities.swift
index b1d2082..d1590c4 100644
--- a/XCTest/XCTimeUtilities.swift
+++ b/XCTest/XCTimeUtilities.swift
@@ -11,7 +11,7 @@
 //  Some simple functions for working with "time intervals".
 //
 
-#if os(Linux)
+#if os(Linux) || os(FreeBSD)
     import Glibc
 #else
     import Darwin