Cygnal compilation

I have problem with Cygnal demo compilation. I instaled SDCC, and when I try build the code i.e make, I see some errors: Parest/ParTest.rel cannot open. All .rel, .sym, .asm and others files are stored in Cygnal folder, i.e. where ‘make’ is executed. I use Cygwin. I’ll greatful for any help.

Cygnal compilation

This might be something as simple as capitalization in the makefile.  I run it from a DOS prompt without Cygwin and its compile.  Under Cygwin the Unix rules of capitalization and / instead of will have to be considered.