acinclude.m4
diff --git a/acinclude.m4 b/acinclude.m4
index af22bcd..bb7d23b 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1883,7 +1883,7 @@
all_includes="$KDE_INCLUDES $all_includes"
fi
-KDE_DEFAULT_CXXFLAGS="-DQT_CLEAN_NAMESPACE -DQT_NO_ASCII_CAST -DQT_NO_STL -DQT_NO_COMPAT -DQT_NO_TRANSLATION"
+KDE_DEFAULT_CXXFLAGS="-DQT_NO_ASCII_CAST -DQT_NO_STL -DQT_NO_COMPAT -DQT_NO_TRANSLATION"
KDE_LDFLAGS="-L$kde_libraries"
if test ! "$kde_libraries" = "$x_libraries" && test ! "$kde_libraries" = "$qt_libraries" ; then