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+/*
+ * O/S-dependent (mis)feature macro definitions
+ *
+Copyright 1991, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+ */
+
+#ifndef _XOSDEFS_H_
+# define _XOSDEFS_H_
+
+/*
+ * X_NOT_POSIX means does not have POSIX header files. Lack of this
+ * symbol does NOT mean that the POSIX environment is the default.
+ * You may still have to define _POSIX_SOURCE to get it.
+ */
+
+
+# ifdef _SCO_DS
+# ifndef __SCO__
+# define __SCO__
+# endif
+# endif
+
+# ifdef __i386__
+# ifdef SYSV
+# if !defined(__SCO__) && \
+ !defined(__UNIXWARE__) && !defined(__sun)
+# if !defined(_POSIX_SOURCE)
+# define X_NOT_POSIX
+# endif
+# endif
+# endif
+# endif
+
+# ifdef __sun
+/* Imake configs define SVR4 on Solaris, but cc & gcc only define __SVR4
+ * This check allows non-Imake configured programs to build correctly.
+ */
+# if defined(__SVR4) && !defined(SVR4)
+# define SVR4 1
+# endif
+# ifdef SVR4
+/* define this to whatever it needs to be */
+# define X_POSIX_C_SOURCE 199300L
+# endif
+# endif
+
+# ifdef WIN32
+# ifndef _POSIX_
+# define X_NOT_POSIX
+# endif
+# endif
+
+
+# ifdef __APPLE__
+# define NULL_NOT_ZERO
+
+/* Defining any of these will sanitize the namespace to JUST want is defined by
+ * that particular standard. If that happens, we don't get some expected
+ * prototypes, typedefs, etc (like fd_mask). We can define _DARWIN_C_SOURCE to
+ * loosen our belts a tad.
+ */
+# if defined(_XOPEN_SOURCE) || defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE)
+# ifndef _DARWIN_C_SOURCE
+# define _DARWIN_C_SOURCE
+# endif
+# endif
+
+# endif
+
+# ifdef __GNU__
+# ifndef PATH_MAX
+# define PATH_MAX 4096
+# endif
+# ifndef MAXPATHLEN
+# define MAXPATHLEN 4096
+# endif
+# endif
+
+# if defined(__SCO__) || defined(__UNIXWARE__)
+# ifndef PATH_MAX
+# define PATH_MAX 1024
+# endif
+# ifndef MAXPATHLEN
+# define MAXPATHLEN 1024
+# endif
+# endif
+
+# if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) \
+ || defined(__APPLE__) || defined(__DragonFly__)
+# ifndef CSRG_BASED
+# define CSRG_BASED
+# endif
+# endif
+
+#endif /* _XOSDEFS_H_ */
+