uClibc may be configured without support for clock_nanosleep(). The function is
only available with uClibc if the C library is build with NPTL support (sets
__UCLIBC_HAS_THREADS_NATIVE__) and __UCLIBC_HAS_ADVANCED_REALTIME__ set.

Upstream status: Pending
https://mailman.videolan.org/pipermail/multicat-devel/2016-March/000129.html

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>

diff -purN multicat-2.1.orig/util.h multicat-2.1/util.h
--- multicat-2.1.orig/util.h	2015-07-15 22:47:39.000000000 +0200
+++ multicat-2.1/util.h	2016-03-20 18:13:51.899780405 +0100
@@ -26,7 +26,10 @@
 
 #ifdef __APPLE__
 #define POLLRDHUP 0
-#else
+/* uClibc may not have clock_nanosleep() available */
+#elif !defined (__UCLIBC__) || \
+       defined (__UCLIBC__) && defined (__UCLIBC_HAS_THREADS_NATIVE__) \
+                            && defined (__UCLIBC_HAS_ADVANCED_REALTIME__)
 #define HAVE_CLOCK_NANOSLEEP
 #endif