+gl_NONBLOCKING_IO
+gl_FCNTL_MODULE_INDICATOR([nonblocking])
+dnl Define the C macro GNULIB_NONBLOCKING to 1.
+gl_MODULE_INDICATOR([nonblocking])
+dnl Define the substituted variable GNULIB_STDIO_H_NONBLOCKING to 1.
+AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+AC_REQUIRE([gl_ASM_SYMBOL_PREFIX])
+GNULIB_STDIO_H_NONBLOCKING=1
+dnl Define the substituted variable GNULIB_UNISTD_H_NONBLOCKING to 1.
+AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+GNULIB_UNISTD_H_NONBLOCKING=1