diff --git a/doc/msys.t2t b/doc/msys.t2t
index 89eaf0ad51b..1b452bcc61d 100644
--- a/doc/msys.t2t
+++ b/doc/msys.t2t
@@ -39,18 +39,18 @@ it, just point the installer to c:\msys\mingw
 
 When Qt installation is complete:
 
-Edit C:\Qt\4.8.0\bin\qtvars.bat and add the following lines:
+Edit C:\Qt\5.9.1\bin\qtvars.bat and add the following lines:
 
 ``` 
 set PATH=%PATH%;C:\msys\local\bin;c:\msys\local\lib 
 set PATH=%PATH%;"C:\Program Files\Subversion\bin" 
 ```
 
-I suggest you also add C:\Qt\4.8.0\bin\ to your Environment Variables Path in
+I suggest you also add C:\Qt\5.9.1\bin\ to your Environment Variables Path in
 the windows system preferences.
 
 If you plan to do some debugging, you'll need to compile debug version of Qt:
-C:\Qt\4.8.0\bin\qtvars.bat compile_debug
+C:\Qt\5.9.1\bin\qtvars.bat compile_debug
 
 Note: there is a problem when compiling debug version of Qt 4.7, the script ends with
 this message  "mingw32-make: *** No rule to make target `debug'.  Stop.". To 
@@ -58,7 +58,7 @@ compile the debug version you have to go out of src directory and execute the
 following command:
 
 ``` 
-c:\Qt\4.8.0 make 
+c:\Qt\5.9.1 make 
 ```
 
 === Flex and Bison ===
@@ -70,11 +70,11 @@ http://sourceforge.net/project/showfiles.php?group_id=23617&package_id=16424
 === Python ===
 
 Follow this section in case you would like to use Python bindings for QGIS.  To
-be able to compile bindings, you need to compile SIP and PyQt4 from sources as
+be able to compile bindings, you need to compile SIP and PyQt5 from sources as
 their installer doesn't include some development files which are necessary.
 
 Note that even if you compile without the Python bindings, Python3 is still
-a necessary dependancy for building QGIS.
+a necessary dependency for building QGIS.
 
 ==== Download and install Python - use Windows installer ====
 
@@ -82,7 +82,7 @@ a necessary dependancy for building QGIS.
 
 http://python.org/download/
 
-==== Download SIP and PyQt4 sources ====
+==== Download SIP and PyQt5 sources ====
 
 http://www.riverbankcomputing.com/software/sip/download
 http://www.riverbankcomputing.com/software/pyqt/download
@@ -93,7 +93,7 @@ to get versions that match your current Qt installed version.
 ==== Compile SIP ====
 
 ``` 
-c:\Qt\4.8.0\bin\qtvars.bat 
+c:\Qt\5.9.1\bin\qtvars.bat 
 python configure.py -p win32-g++ 
 make 
 make install 
@@ -102,7 +102,7 @@ make install
 ==== Compile PyQt ====
 
 ``` 
-c:\Qt\4.8.0\bin\qtvars.bat 
+c:\Qt\5.9.1\bin\qtvars.bat 
 python configure.py 
 make 
 make install 
@@ -110,7 +110,7 @@ make install
 
 ==== Final python notes ====
 
-/!\ You can delete the directories with unpacked SIP and PyQt4 sources after a
+/!\ You can delete the directories with unpacked SIP and PyQt5 sources after a
 successful install, they're not needed anymore.
 
 === git ===
@@ -151,10 +151,10 @@ Start a cmd.exe window ( Start -> Run -> cmd.exe ) if you don't have one
 already.  Add paths to compiler and our MSYS environment:
   
 ``` 
-c:\Qt\4.8.0\bin\qtvars.bat 
+c:\Qt\5.9.1\bin\qtvars.bat 
 ```
 
-For ease of use add c:\Qt\4.8.0\bin\ to your system path in system
+For ease of use add c:\Qt\5.9.1\bin\ to your system path in system
 properties so you can just type qtvars.bat when you open the cmd console.
 Create build directory and set it as current directory: