use $(DESTDIR) for Gem's --with-pd flag on Windows
For some reason Gem can't find the header or pd.exe using the "--with-pd=$(pd_src)" flag. Instead, use $(DESTDIR), which will hold the bin/pd.exe and headers that Gem needs to compile.
For some reason Gem can't find the header or pd.exe using the "--with-pd=$(pd_src)" flag. Instead, use $(DESTDIR), which will hold the bin/pd.exe and headers that Gem needs to compile.