openipmi: fix missing -lrt for clock_gettime

new file mode 100644
index 000000000000..d58ffd7caf26
@@ -0,0 +1,57 @@
+From d3be03464be7fa3844dfe0837a7e2c920c107836 Mon Sep 17 00:00:00 2001
+From: Baruch Siach <[email protected]>
+Date: Thu, 23 Jul 2015 13:35:35 +0300
+Subject: [PATCH] configure.ac: detect -lrt requirement for clock_gettime
+
+glibc versions before 2.17 require link with -lrt.
+
+Upstream status: sent, stuck in moderator's queue
+
+Signed-off-by: Baruch Siach <[email protected]>
+---
+ configure.ac     | 8 ++++++++
+ unix/Makefile.am | 4 ++--
+ 2 files changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 18401f161d45..6b350a41a916 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -854,6 +854,14 @@ OPENIPMI_SWIG_SO="${PYTHON_POSIX_SO}:\$(top_builddir)/lib/.libs/libOpenIPMI.so:\
+ AC_SUBST(OPENIPMI_SWIG_LIBS)
+ AC_SUBST(OPENIPMI_SWIG_SO)
+ 
++LIB_CLOCK_GETTIME=
++clk_saved_libs=$LIBS
++AC_SEARCH_LIBS([clock_gettime], [rt],
++	       [test "$ac_cv_search_clock_gettime" = "none required" ||
++		LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
++AC_SUBST([LIB_CLOCK_GETTIME])
++LIBS=$clk_saved_libs
++
+ # Everything from here to AC_OUTPUT is for libedit
+ 
+ # AC_PROG_LIBTOOL runs AC_CANONICAL_HOST
+diff --git a/unix/Makefile.am b/unix/Makefile.am
+index a108bc679c9a..fb60242d5d3b 100644
+--- a/unix/Makefile.am
++++ b/unix/Makefile.am
+@@ -9,13 +9,13 @@ lib_LTLIBRARIES = libOpenIPMIposix.la libOpenIPMIpthread.la
+ 
+ libOpenIPMIpthread_la_SOURCES = posix_thread_os_hnd.c selector.c
+ libOpenIPMIpthread_la_LIBADD = -lpthread $(GDBM_LIB) \
+-	$(top_builddir)/utils/libOpenIPMIutils.la
++	$(top_builddir)/utils/libOpenIPMIutils.la $(LIB_CLOCK_GETTIME)
+ libOpenIPMIpthread_la_LDFLAGS = -rdynamic -version-info $(LD_VERSION) \
+ 	-Wl,-Map -Wl,libOpenIPMIpthread.map
+ 
+ libOpenIPMIposix_la_SOURCES = posix_os_hnd.c selector.c
+ libOpenIPMIposix_la_LIBADD = $(top_builddir)/utils/libOpenIPMIutils.la \
+-	$(GDBM_LIB)
++	$(GDBM_LIB) $(LIB_CLOCK_GETTIME)
+ libOpenIPMIposix_la_LDFLAGS = -rdynamic -version-info $(LD_VERSION) \
+ 	-Wl,-Map -Wl,libOpenIPMIposix.map
+ 
+-- 
+2.1.4
+

index 667efa74a863..da886578f835 100644
@@ -11,6 +11,8 @@ config BR2_PACKAGE_OPENIPMI
 	  to interact with IPMI enabled devices. OpenIPMI also provides
 	  an IPMI BMC simulator.
 
+	  http://openipmi.sourceforge.net
+
 comment "openipmi needs a toolchain w/ dynamic library, threads"
 	depends on BR2_USE_MMU
 	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS