Patch #532729: check for sem_init in -lrt.
diff --git a/configure.in b/configure.in
index ac14e18..3f36c8f 100644
--- a/configure.in
+++ b/configure.in
@@ -916,6 +916,7 @@
 # checks for libraries
 AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
 AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX
+AC_CHECK_LIB(rt, sem_init)	# 'Real Time' functions on Solaris
 
 # checks for system dependent C++ extensions support
 case "$ac_sys_system" in