+#if @GNULIB_GETUSERSHELL@
+# if !@HAVE_GETUSERSHELL@
+/* Return the next valid login shell on the system, or NULL when the end of
+ the list has been reached. */
+extern char *getusershell (void);
+/* Rewind to pointer that is advanced at each getusershell() call. */
+extern void setusershell (void);
+/* Free the pointer that is advanced at each getusershell() call and
+ associated resources. */
+extern void endusershell (void);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef getusershell
+# define getusershell() \
+ (GL_LINK_WARNING ("getusershell is unportable - " \
+ "use gnulib module getusershell for portability"), \
+ getusershell ())
+# undef setusershell
+# define setusershell() \
+ (GL_LINK_WARNING ("setusershell is unportable - " \
+ "use gnulib module getusershell for portability"), \
+ setusershell ())
+# undef endusershell
+# define endusershell() \
+ (GL_LINK_WARNING ("endusershell is unportable - " \
+ "use gnulib module getusershell for portability"), \
+ endusershell ())
+#endif
+
+