--- qwt-6.1.2/qwtconfig.pri	2015-06-11 23:03:59.238534842 +0200
+++ qwt-6.1.2/qwtconfig.pri	2015-06-11 23:05:09.136418503 +0200
@@ -19,7 +19,7 @@
 QWT_INSTALL_PREFIX = $$[QT_INSTALL_PREFIX]
 
 unix {
-    QWT_INSTALL_PREFIX    = /usr/local/qwt-$$QWT_VERSION
+    QWT_INSTALL_PREFIX    = /usr
     # QWT_INSTALL_PREFIX = /usr/local/qwt-$$QWT_VERSION-qt-$$QT_VERSION
 }
 
@@ -28,7 +28,7 @@
     # QWT_INSTALL_PREFIX = C:/Qwt-$$QWT_VERSION-qt-$$QT_VERSION
 }
 
-QWT_INSTALL_DOCS      = $${QWT_INSTALL_PREFIX}/doc
+QWT_INSTALL_DOCS      = $${QWT_INSTALL_PREFIX}/share
 QWT_INSTALL_HEADERS   = $${QWT_INSTALL_PREFIX}/include
 QWT_INSTALL_LIBS      = $${QWT_INSTALL_PREFIX}/lib
 
@@ -63,7 +63,7 @@
 # with every Qt upgrade. 
 ######################################################################
 
-QWT_INSTALL_FEATURES  = $${QWT_INSTALL_PREFIX}/features
+QWT_INSTALL_FEATURES  = $${QWT_INSTALL_PREFIX}/share/qt4/mkspecs/features
 # QWT_INSTALL_FEATURES  = $$[QT_INSTALL_PREFIX]/features
 
 ######################################################################