+ AC_REQUIRE([gl_HEADER_SYS_SOCKET])
+ AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
+ AC_CACHE_CHECK([whether <sys/select.h> is self-contained],
+ [gl_cv_header_sys_select_h_selfcontained],
+ [
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/select.h>]],
+ [[struct timeval b;]])],
+ [gl_cv_header_sys_select_h_selfcontained=yes],
+ [gl_cv_header_sys_select_h_selfcontained=no])
+ ])
+ if test $gl_cv_header_sys_select_h_selfcontained = yes; then