updated for version 7.3.1313
Problem:    :py and :py3 don't work when compiled with Cygwin or MingW with 64
            bit.
Solution:   Add -DMS_WIN64 to the build command. (Ken Takata)
diff --git a/src/Make_cyg.mak b/src/Make_cyg.mak
index 68c44f0..f955b4d 100644
--- a/src/Make_cyg.mak
+++ b/src/Make_cyg.mak
@@ -118,6 +118,9 @@
 
 DEFINES = -DWIN32 -DHAVE_PATHDEF -DFEAT_$(FEATURES) \
 	  -DWINVER=$(WINVER) -D_WIN32_WINNT=$(WINVER)
+ifeq ($(ARCH),x86-64)
+DEFINES+=-DMS_WIN64
+endif
 INCLUDES = -march=$(ARCH) -Iproto
 
 #>>>>> name of the compiler and linker, name of lib directory