diff -up avogadro-1.1.1/CMakeLists.txt.mkspecs-dir avogadro-1.1.1/CMakeLists.txt
--- avogadro-1.1.1/CMakeLists.txt.mkspecs-dir	2014-01-24 23:43:01.618510517 -0600
+++ avogadro-1.1.1/CMakeLists.txt	2014-01-24 23:44:03.236844746 -0600
@@ -547,7 +547,7 @@ if(QT_MKSPECS_DIR AND INSTALL_QMAKE_PRF)
 #    )
     install(FILES
       "${CMAKE_CURRENT_BINARY_DIR}/avogadro.prf"
-      DESTINATION "${CMAKE_INSTALL_PREFIX}/${QT_MKSPECS_RELATIVE}/features"
+      DESTINATION "${QT_MKSPECS_DIR}/features"
     )
 #  endif ("${QT_MKSPECS_DIR}" MATCHES ^$"${CMAKE_INSTALL_PREFIX}/")
 else()