+/* mingw, MSVC, BeOS, Haiku declare environ in <stdlib.h>, not in
+ <unistd.h>. */
+/* Solaris declares getcwd not only in <unistd.h> but also in <stdlib.h>. */
+/* OSF Tru64 Unix cannot see gnulib rpl_strtod when system <stdlib.h> is
+ included here. */
+/* But avoid namespace pollution on glibc systems. */
+#if !defined __GLIBC__ && !defined __osf__
+# define __need_system_stdlib_h
+# include <stdlib.h>
+# undef __need_system_stdlib_h
+#endif
+
+/* Native Windows platforms declare chdir, getcwd, rmdir in
+ <io.h> and/or <direct.h>, not in <unistd.h>.
+ They also declare access(), chmod(), close(), dup(), dup2(), isatty(),
+ lseek(), read(), unlink(), write() in <io.h>. */
+#if ((@GNULIB_CHDIR@ || @GNULIB_GETCWD@ || @GNULIB_RMDIR@ \
+ || defined GNULIB_POSIXCHECK) \
+ && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
+# include <io.h> /* mingw32, mingw64 */
+# include <direct.h> /* mingw64, MSVC 9 */
+#elif (@GNULIB_CLOSE@ || @GNULIB_DUP@ || @GNULIB_DUP2@ || @GNULIB_ISATTY@ \
+ || @GNULIB_LSEEK@ || @GNULIB_READ@ || @GNULIB_UNLINK@ || @GNULIB_WRITE@ \
+ || defined GNULIB_POSIXCHECK) \
+ && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)
+# include <io.h>
+#endif
+
+/* AIX and OSF/1 5.1 declare getdomainname in <netdb.h>, not in <unistd.h>.
+ NonStop Kernel declares gethostname in <netdb.h>, not in <unistd.h>. */
+/* But avoid namespace pollution on glibc systems. */
+#if ((@GNULIB_GETDOMAINNAME@ && (defined _AIX || defined __osf__)) \
+ || (@GNULIB_GETHOSTNAME@ && defined __TANDEM)) \
+ && !defined __GLIBC__
+# include <netdb.h>
+#endif