Only in srelay-0.4.6+iPhone/: config.log
diff -r -u srelay-0.4.6/configure.in srelay-0.4.6+iPhone/configure.in
--- srelay-0.4.6/configure.in	2003-04-14 05:36:15.000000000 +0000
+++ srelay-0.4.6+iPhone/configure.in	2007-12-27 12:32:59.000000000 +0000
@@ -143,22 +143,7 @@
 	elif test "$OS" = "SOLARIS"; then
 	    LDFLAGS="$LDFLAGS -lpthread"
 	fi
-	AC_TRY_RUN(
-[#include <pthread.h>
-void
-init_routine()
-{
-    return(0);
-}
-main()
-{
-    pthread_once_t once_control = PTHREAD_ONCE_INIT;
-    pthread_once(&once_control, &init_routine);
-    return(0);
-}],
-	AC_DEFINE(USE_THREAD) AC_MSG_RESULT([yes]),
-	CFLAGS="$save_CFLAGS"; LDFLAGS="$save_LDFLAGS"; AC_MSG_RESULT([no])
-	)
+	AC_DEFINE(USE_THREAD) AC_MSG_RESULT([yes])
     fi
 fi