Add support for QNX Neutrino.

patches/xopen_source.patch

Index: patches/xopen_source.patch
diff --git a/patches/xopen_source.patch b/patches/xopen_source.patch
new file mode 100644
index 0000000000000000000000000000000000000000..964951c3df42cabd56d7fb75483028c459156cc6
--- /dev/null
+++ b/patches/xopen_source.patch
@@ -0,0 +1,28 @@
+--- source/common/putil.c
++++ source/common/putil.c
+@@ -37,15 +37,17 @@
+ ******************************************************************************
+ */
+ 
+-/* Define _XOPEN_SOURCE for Solaris and friends. */
+-/* NetBSD needs it to be >= 4 */
+-#if !defined(_XOPEN_SOURCE)
+-#if __STDC_VERSION__ >= 199901L
+-/* It is invalid to compile an XPG3, XPG4, XPG4v2 or XPG5 application using c99 on Solaris */
+-#define _XOPEN_SOURCE 600
++/* Define _XOPEN_SOURCE for access to POSIX functions. */
++#ifdef _XOPEN_SOURCE
++    /* Use the predefined value. */
+ #else
+-#define _XOPEN_SOURCE 4
+-#endif
++    /*
++     * Version 6.0:
++     * The Open Group Base Specifications Issue 6 (IEEE Std 1003.1, 2004 Edition)
++     * also known as
++     * SUSv3 = Open Group Single UNIX Specification, Version 3 (UNIX03)
++     */
++#   define _XOPEN_SOURCE 600
+ #endif
+ 
+ /* Make sure things like readlink and such functions work.