diff --git a/acinclude.m4 b/acinclude.m4
index f2fac4b..62b3b43 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1026,7 +1026,7 @@ EOF
 
 if test $kde_qtsubver -gt 0; then
 cat >> conftest.$ac_ext <<EOF
-#if QT_VERSION < 210
+#if TQT_VERSION < 210
 #error 1
 #endif
 EOF
@@ -1115,20 +1115,20 @@ fi
 if test -z "$3"; then
    if test $kde_qtver = 3; then
      if test $kde_qtsubver -gt 0; then
-       kde_qt_verstring="QT_VERSION >= 0x030100"
+       kde_qt_verstring="TQT_VERSION >= 0x030100"
      else
-       kde_qt_verstring="QT_VERSION >= 300"
+       kde_qt_verstring="TQT_VERSION >= 300"
      fi
    fi
    if test $kde_qtver = 2; then
      if test $kde_qtsubver -gt 0; then
-       kde_qt_verstring="QT_VERSION >= 222"
+       kde_qt_verstring="TQT_VERSION >= 222"
      else
-       kde_qt_verstring="QT_VERSION >= 200"
+       kde_qt_verstring="TQT_VERSION >= 200"
      fi
    fi
    if test $kde_qtver = 1; then
-    kde_qt_verstring="QT_VERSION >= 142 && QT_VERSION < 200"
+    kde_qt_verstring="TQT_VERSION >= 142 && TQT_VERSION < 200"
    fi
 else
    kde_qt_verstring=$3