diff --git a/cmake/FindQwt6.cmake b/cmake/FindQwt6.cmake
index f525a1c..1ac5b75 100644
--- a/cmake/FindQwt6.cmake
+++ b/cmake/FindQwt6.cmake
@@ -1,112 +1,114 @@
 # Qt Widgets for Technical Applications
 # available at http://www.http://qwt.sourceforge.net/
 #
 # The module defines the following variables:
 #  QWT_FOUND - the system has Qwt
 #  QWT_INCLUDE_DIR - where to find qwt_plot.h
 #  QWT_INCLUDE_DIRS - qwt includes
 #  QWT_LIBRARY - where to find the Qwt library
 #  QWT_LIBRARIES - aditional libraries
 #  QWT_MAJOR_VERSION - major version
 #  QWT_MINOR_VERSION - minor version
 #  QWT_PATCH_VERSION - patch version
 #  QWT_VERSION_STRING - version (ex. 5.2.1)
 #  QWT_ROOT_DIR - root dir (ex. /usr/local)
 
 #=============================================================================
 # Copyright 2010-2013, Julien Schueller
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 # 1. Redistributions of source code must retain the above copyright notice, this
 #    list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright notice,
 #    this list of conditions and the following disclaimer in the documentation
 #    and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 # The views and conclusions contained in the software and documentation are those
 # of the authors and should not be interpreted as representing official policies,
 # either expressed or implied, of the FreeBSD Project.
 #=============================================================================
 
+find_package( PkgConfig QUIET )
+pkg_search_module( PKG_QWT QUIET qwt>=6.0.0 Qt5Qwt6>=6.0.0 )
 
 find_path ( QWT_INCLUDE_DIR
   NAMES qwt_plot.h
-  HINTS ${QT_INCLUDE_DIR}
+  HINTS ${PKG_QWT_INCLUDEDIR} ${QT_INCLUDE_DIR}
   PATH_SUFFIXES qwt qwt-qt3 qwt-qt4 qwt-qt5
   )
 
 set ( QWT_INCLUDE_DIRS ${QWT_INCLUDE_DIR} )
 
 # version
 set ( _VERSION_FILE ${QWT_INCLUDE_DIR}/qwt_global.h )
 if ( EXISTS ${_VERSION_FILE} )
   file ( STRINGS ${_VERSION_FILE} _VERSION_LINE REGEX "define[ ]+QWT_VERSION_STR" )
   if ( _VERSION_LINE )
     string ( REGEX REPLACE ".*define[ ]+QWT_VERSION_STR[ ]+\"(.*)\".*" "\\1" QWT_VERSION_STRING "${_VERSION_LINE}" )
     string ( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\1" QWT_MAJOR_VERSION "${QWT_VERSION_STRING}" )
     string ( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\2" QWT_MINOR_VERSION "${QWT_VERSION_STRING}" )
     string ( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\3" QWT_PATCH_VERSION "${QWT_VERSION_STRING}" )
   endif ()
 endif ()
 
 
 # check version
 set ( _QWT_VERSION_MATCH TRUE )
 if ( Qwt_FIND_VERSION AND QWT_VERSION_STRING )
   if ( Qwt_FIND_VERSION_EXACT )
     if ( NOT Qwt_FIND_VERSION VERSION_EQUAL QWT_VERSION_STRING )
       set ( _QWT_VERSION_MATCH FALSE )
     endif ()
   else ()
     if ( QWT_VERSION_STRING VERSION_LESS Qwt_FIND_VERSION )
       set ( _QWT_VERSION_MATCH FALSE )
     endif ()
   endif ()
 endif ()
 
 
 find_library ( QWT_LIBRARY
   NAMES qwt qwt-qt3 qwt-qt4 qwt-qt5
   )
 
 set ( QWT_LIBRARIES ${QWT_LIBRARY} )
 
 
 # try to guess root dir from include dir
 if ( QWT_INCLUDE_DIR )
   string ( REGEX REPLACE "(.*)/include.*" "\\1" QWT_ROOT_DIR ${QWT_INCLUDE_DIR} )
   # try to guess root dir from library dir
 elseif ( QWT_LIBRARY )
   string ( REGEX REPLACE "(.*)/lib[/|32|64].*" "\\1" QWT_ROOT_DIR ${QWT_LIBRARY} )
 endif ()
 
 
 # handle the QUIETLY and REQUIRED arguments
 include ( FindPackageHandleStandardArgs )
 find_package_handle_standard_args( Qwt6 DEFAULT_MSG QWT_LIBRARY QWT_INCLUDE_DIR _QWT_VERSION_MATCH )
 
 mark_as_advanced (
   QWT_LIBRARY
   QWT_LIBRARIES
   QWT_INCLUDE_DIR
   QWT_INCLUDE_DIRS
   QWT_MAJOR_VERSION
   QWT_MINOR_VERSION
   QWT_PATCH_VERSION
   QWT_VERSION_STRING
   QWT_ROOT_DIR
   )