https://lists.gnu.org/archive/html/bug-gnulib/2016-03/msg00065.html

--- a/gnulib/lib/sys_select.in.h.orig	2014-08-03 15:31:22.000000000 +0200
+++ a/gnulib/lib/sys_select.in.h	2016-05-19 12:57:51.243064700 +0200
@@ -81,7 +81,7 @@
    Also, Mac OS X, AIX, HP-UX, IRIX, Solaris, Interix declare select()
    in <sys/time.h>.
    But avoid namespace pollution on glibc systems.  */
-# ifndef __GLIBC__
+# if !(defined __GLIBC__ || defined __NEWLIB__)
 #  include <sys/time.h>
 # endif
 
@@ -102,7 +102,7 @@
    But avoid namespace pollution on glibc systems.
    Do this after the include_next (for the sake of OpenBSD 5.0) but before
    the split double-inclusion guard (for the sake of Solaris).  */
-#if !(defined __GLIBC__ && !defined __UCLIBC__)
+#if !((defined __GLIBC__ || defined __NEWLIB__) && !defined __UCLIBC__)
 # include <signal.h>
 #endif
 
