Show RT_LIBS in ./configure output.
diff --git a/configure.ac b/configure.ac
index c35185b..554fbd9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -525,7 +525,7 @@ echo "Compilation............: make (or gmake)"
echo " CPPFLAGS.............: $CPPFLAGS"
echo " CFLAGS...............: $CFLAGS"
echo " LDFLAGS..............: $LDFLAGS $PTHREAD_FLAGS"
-echo " LDADD................: $DLOPEN_FLAGS $LIBCURL_LIBS $JANSSON_LIBS $PTHREAD_LIBS $OPENCL_LIBS $NCURSES_LIBS $PDCURSES_LIBS $WS2_LIBS $MATH_LIBS $LIBUSB_LIBS"
+echo " LDADD................: $DLOPEN_FLAGS $LIBCURL_LIBS $JANSSON_LIBS $PTHREAD_LIBS $OPENCL_LIBS $NCURSES_LIBS $PDCURSES_LIBS $WS2_LIBS $MATH_LIBS $LIBUSB_LIBS $RT_LIBS"
echo
echo "Installation...........: make install (as root if needed, with 'su' or 'sudo')"
echo " prefix...............: $prefix"