How to link gfortran with Abaqus6.14 ?

Dear Abaqus Experts:

I am new Subroutine user and I want to analyze plastic deformation behavior of micro component.

So, I have to link Abaqus,gfortran,and Microsoft Visual Studio.

I tried several methods by reference to the following link,but I have not yet been successful in them.

So, I'm a very necessary help of Abaqus experts.

Detail

1) I added the command "mingwvars.bat" to Abaqus Command > right click > properties > target

2) I double-clicked "vcvarsall.bat" and "mingwvars.bat".

3) I typed "set >path.info" on Abaqus Command window.

4) I edited environment variables. Control Panel > System > Adbanced tab > Environment Variables

5) I typed "abaqus verify -user_std". But it is displayed as ERROR on Abaqus Command window.

I referenced these links.

http://www-h.eng.cam.ac.uk/help/programs/fe/abaqus/faq68/UserSubConfigureInfo.html

http://imechanica.org/node/11219

http://imechanica.org/node/13370

http://manishkumar.org/manishkumar/resources/softwares/abaqus/AbaqusLinking.pdf

I tell you my current work environment.

OS:Windows7 Professional SP1

Abaqus:Abaqus standard 6.14-5

Compiler:gfortran

Visual Studio:Microsoft Visual Studio Community 2015

Please help me.