diff --git a/configure.in.in b/configure.in.in
index 2354329b..e7dceea1 100644
--- a/configure.in.in
+++ b/configure.in.in
@@ -196,7 +196,7 @@ AC_DEFUN([QUANTA_CHECK_MDI],
     AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
     save_CXXFLAGS="$CXXFLAGS"
-    CXXFLAGS="$KDE_INCLUDES $QT_INCLUDES"
+    CXXFLAGS="$KDE_INCLUDES $TQT_INCLUDES"
 
     AC_TRY_LINK([
       #include <tdeversion.h>
diff --git a/quanta/parts/kafka/configure.in.in b/quanta/parts/kafka/configure.in.in
index 9bb811d9..418c4554 100644
--- a/quanta/parts/kafka/configure.in.in
+++ b/quanta/parts/kafka/configure.in.in
@@ -9,7 +9,7 @@ AC_DEFUN([QUANTA_CHECK_VPL],
     AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
     save_CXXFLAGS="$CXXFLAGS"
-    CXXFLAGS="$KDE_INCLUDES $QT_INCLUDES"
+    CXXFLAGS="$KDE_INCLUDES $TQT_INCLUDES"
 
     AC_TRY_LINK([
       #include <tdeversion.h>