tsearch2 regression test path problem

The makefile for tsearch2 has this rule:

tsearch2.sql: tsearch.sql.in   sed -e 's,MODULE_PATHNAME,$$libdir/$(MODULE_big),g' \       -e
's,DATA_PATH,$(datadir)/contrib,g'$< >$@
 


The problem is that on Windows, $(datadir) is typically a virtual Msys 
path (or least typically it is for me) which is not understood by a 
running backend, so when it goes to load the file with "make 
installcheck" it can't find it.

I'm not sure if there is some nicely portable way around this. Any 
suggestions?

cheers

andrew