-# Prerequisites of lib/sigprocmask.c.
-AC_DEFUN([gl_PREREQ_SIGPROCMASK], [
- AC_CHECK_FUNCS_ONCE(raise)
+# Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c.
+AC_DEFUN([gl_PREREQ_SIGPROCMASK],
+[
+ AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
+ AC_CHECK_TYPES([sigset_t],
+ [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
+ [#include <signal.h>
+/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
+#include <sys/types.h>])
+ if test $gl_cv_type_sigset_t != yes; then
+ HAVE_SIGSET_T=0
+ fi
+ dnl HAVE_SIGSET_T is 1 if the system lacks the sigprocmask function but has
+ dnl the sigset_t type.
+ AC_SUBST([HAVE_SIGSET_T])