+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+ dnl Persuade glibc <unistd.h> to declare {get,set,end}usershell().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ dnl Check whether the getusershell function exists.
+ AC_CHECK_FUNCS_ONCE([getusershell])
+ if test $ac_cv_func_getusershell = yes; then
+ HAVE_GETUSERSHELL=1
+ dnl Check whether getusershell is declared.
+ AC_CHECK_DECLS([getusershell])
+ if test $ac_cv_have_decl_getusershell = no; then
+ HAVE_DECL_GETUSERSHELL=0
+ fi
+ else
+ HAVE_GETUSERSHELL=0
+ dnl Assume that on platforms which declare it, the function exists.
+ HAVE_DECL_GETUSERSHELL=0
+ fi