The -Yd option is deprecated anyway and generates an ugly warning
"option 'Yd' has been deprecated and will be removed in a future
release" for each file compiled in an --enable-symbol or
--enable-debug build now.

So just use the same as in gbuild for now, only -Zi for both
CFLAGSENABLESYMBOLS and CFLAGSDEBUG. Let the .pdb file be in its
default location.