PC Toledo

if -m do not solve duplicated, then you need check the files, may be files are duplicated on hbp, may be functions are duplicated inside source code.
linker shows the 2 files where functions are found.

hbmk2 only call the tools, including harbour.exe, using parameters on hbp

-m is a harbour parameter, same on Clipper and XHarbour

Thank you very much, I finally managed to solve the problem.
Minigui Extended does not include the CONTRIB folder

C:\MiniGUI\Harbour\contrib

Add this lines
hbct.hbc
hbnf.hbc
xhb.hbc

Install Harbor copy the contrib folder to the minigui folder and it worked.
Thank you Jose Quintas for following up on my case.

Unfortunatelly minigui extended modify harbour files.

See on image, hbmk2 shows the possible solution, using harbour original files.