--- a/qwtfunctions.pri
+++ b/qwtfunctions.pri
@@ -68,15 +68,6 @@
 
     isEmpty(LINKAGE) {
 
-        if(!debug_and_release|build_pass):CONFIG(debug, debug|release) {
-
-            mac:LINKAGE = -l$${LIB_NAME}_debug
-            win32:LINKAGE = -l$${LIB_NAME}d
-        }
-    }
-
-    isEmpty(LINKAGE) {
-
         LINKAGE = -l$${LIB_NAME}
     }