diff -up qwt-5.2.1/qwtconfig.pri.install_qt qwt-5.2.1/qwtconfig.pri
--- qwt-5.2.1/qwtconfig.pri.install_qt	2010-04-11 04:55:06.000000000 -0500
+++ qwt-5.2.1/qwtconfig.pri	2011-07-14 08:22:26.207212795 -0500
@@ -7,6 +7,11 @@ VER_MIN      = 2
 VER_PAT      = 1
 VERSION      = $${VER_MAJ}.$${VER_MIN}.$${VER_PAT}
 
+CONFIG(install-qt) {
+target.path    = $$[QT_INSTALL_LIBS] 
+headers.path   = $$[QT_INSTALL_HEADERS]/qwt
+doc.path       = $$[QT_INSTALL_DOCS] 
+} else {
 unix {
     INSTALLBASE    = /usr/local/qwt-5.2.1
 }
@@ -18,6 +23,7 @@ win32 {
 target.path    = $$INSTALLBASE/lib
 headers.path   = $$INSTALLBASE/include
 doc.path       = $$INSTALLBASE/doc
+}
 
 ######################################################################
 # qmake internal options
diff -up qwt-5.2.1/src/src.pro.install_qt qwt-5.2.1/src/src.pro
--- qwt-5.2.1/src/src.pro.install_qt	2010-04-11 04:55:06.000000000 -0500
+++ qwt-5.2.1/src/src.pro	2011-07-14 08:30:39.759190828 -0500
@@ -220,9 +220,17 @@ contains(CONFIG, QwtWidgets) {
 # Install directives
 
 headers.files  = $$HEADERS
-doc.files      = $${QWT_ROOT}/doc/html $${QWT_ROOT}/doc/qwt-5.2.0.qch
-unix {
-    doc.files      += $${QWT_ROOT}/doc/man
-}
+INSTALLS      += target headers
+
+html.files     = $${QWT_ROOT}/doc/html
+html.path      = $$[QT_INSTALL_DOCS]/html/
+INSTALLS      += html
+
+qch.files      = $${QWT_ROOT}/doc/qwt-5.2.0.qch
+qch.path       = $$[QT_INSTALL_DOCS]/qch
+INSTALLS      += qch 
+
+unix:man.files += $${QWT_ROOT}/doc/man
+unix:man.path  = /usr/share
+unix:INSTALLS  += man
 
-INSTALLS       = target headers doc