diff --git a/acinclude.m4.in b/acinclude.m4.in
index 196d38a..78fbc3e 100644
--- a/acinclude.m4.in
+++ b/acinclude.m4.in
@@ -1378,9 +1378,13 @@ if test $kde_qtver = 3; then
   if test "$PKG_CONFIG" != "no" ; then
     if $PKG_CONFIG --exists qt-mt ; then
        kde_qt_dirs="$kde_qt_dirs `$PKG_CONFIG --variable=prefix qt-mt`"
+       LIB_QUI="-lqui"
+       AC_SUBST(LIB_QUI)
     else
        if $PKG_CONFIG --exists tqt-mt ; then
          kde_qt_dirs="$kde_qt_dirs `$PKG_CONFIG --variable=prefix tqt-mt`"
+         LIB_QUI="-ltqui"
+         AC_SUBST(LIB_QUI)
        fi
     fi
   fi