Hi Enrico.
Try edit next files and please, change bcc55 to your bcc path:
bcc32c.cfg:
-I"c:\harbour\bcc55\include";"c:\harbour\bcc55\include\windows\crtl";"c:\harbour\bcc55\include\windows\rtl";"c:\harbour\bcc55\include\windows\sdk";"c:\harbour\bcc55\include\dinkumware64"
-L"c:\harbour\bcc55\lib\win32c\release";"c:\harbour\bcc55\lib\win32c\release\psdk"
ilink32.cfg
-L"c:\harbour\bcc55\lib\win32c\release";"c:\harbour\bcc55\lib\win32c\release\psdk"
best regards'.
PS: this is only an idea, not tested yet...