--- a/old-configure.in
+++ b/old-configure.in
@@ -1752,16 +1752,17 @@ dnl ====================================
 dnl Checks for X libraries.
 dnl Ordering is important.
 dnl Xt is dependent upon SM as of X11R6
 dnl ========================================================
 if test -n "$MOZ_X11"; then
     AC_DEFINE_UNQUOTED(FUNCPROTO,15)
     XLIBS="-lX11-xcb -lX11 -lxcb-shm -lxcb $XLIBS"
     _SAVE_LDFLAGS="$LDFLAGS"
+    _SAVE_LIBS="$LIBS"
     LDFLAGS="$XLDFLAGS $LDFLAGS"
     AC_CHECK_LIB(X11, XDrawLines, [X11_LIBS="-lX11"],
         [MISSING_X="$MISSING_X -lX11"], $XLIBS)
     AC_CHECK_LIB(Xext, XextAddDisplay, [XEXT_LIBS="-lXext"],
         [MISSING_X="$MISSING_X -lXext"], $XLIBS)
 
     AC_CHECK_LIB(Xt, XtFree, [ XT_LIBS="-lXt"], [
         unset ac_cv_lib_Xt_XtFree
@@ -1782,16 +1783,17 @@ if test -n "$MOZ_X11"; then
     dnl = Check for Xss
     dnl ========================================================
     MOZ_CHECK_HEADER(X11/extensions/scrnsaver.h,
         AC_CHECK_LIB(Xss, XScreenSaverQueryInfo,
             [XSS_LIBS="-lXss $XEXT_LIBS $XLIBS"
              AC_DEFINE(HAVE_LIBXSS)],, $XEXT_LIBS $XLIBS))
 
     LDFLAGS="$_SAVE_LDFLAGS"
+    LIBS="$_SAVE_LIBS"
 fi # $MOZ_X11
 
 AC_SUBST_LIST(XCFLAGS)
 AC_SUBST_LIST(XLDFLAGS)
 AC_SUBST_LIST(XLIBS)
 AC_SUBST_LIST(XEXT_LIBS)
 AC_SUBST_LIST(XT_LIBS)
 AC_SUBST_LIST(XSS_LIBS)