diff -up qwt-5.2.2/designer/designer.pro.install_qt qwt-5.2.2/designer/designer.pro
--- qwt-5.2.2/designer/designer.pro.install_qt	2011-08-01 04:28:22.000000000 -0500
+++ qwt-5.2.2/designer/designer.pro	2012-08-14 11:11:22.569229749 -0500
@@ -36,6 +37,7 @@ contains(CONFIG, QwtDesigner) {
         else {
             SUFFIX_STR = $${RELEASE_SUFFIX}
         }
+        LIBNAME         = qwt$${SUFFIX_STR}
     }
 
     TEMPLATE        = lib
@@ -45,7 +47,6 @@ contains(CONFIG, QwtDesigner) {
     INCLUDEPATH    += $${QWT_ROOT}/src 
     DEPENDPATH     += $${QWT_ROOT}/src 
 
-    LIBNAME         = qwt$${SUFFIX_STR}
     contains(CONFIG, QwtDll) {
         win32 {
             DEFINES += QT_DLL QWT_DLL
@@ -103,7 +104,7 @@ contains(CONFIG, QwtDesigner) {
 
         # Qt 4
 
-        TARGET    = qwt_designer_plugin$${SUFFIX_STR}
+        TARGET    = qwt5_designer_plugin$${SUFFIX_STR}
         CONFIG    += qt designer plugin 
 
         RCC_DIR   = resources