qt-tools are named tool-qt5 in suse :p

ax_check_qt.m4

@@ -50,7 +50,7 @@ AC_DEFUN([AX_CXX_QT_TOOL], [
     $1=${$1:-$(${PKG_CONFIG} --variable=host_bins QtCore)/$2}
     if ! which "${$1%% *}" > /dev/null; then
       if which "$2-qt5" > /dev/null; then
-        $1=$2
+        $1=$2-qt5
       elif which "$2" > /dev/null; then
         $1=$2
       else