2008-06-22 Bruno Haible <bruno@clisp.org>
+ * m4/signalblocking.m4 (gl_PREREQ_SIG_HANDLER_H): New macro.
+ (gl_PREREQ_SIGPROCMASK): Invoke it.
+ * m4/sigaction.m4 (gl_PREREQ_SIGACTION): Likewise.
+
* lib/nanosleep.c (rpl_nanosleep): Setup newact only when it is needed.
* lib/sigprocmask.c: Update a comment.