Final warnings I get are of the following form:
3> Generating LyX2.3.pot
3>CUSTOMBUILD : cygwin warning :
3> MS-DOS style path detected: C:/LyX/lyx-23-build/po/POTFILES.in
3> Preferred POSIX equivalent is:
/cygdrive/c/LyX/lyx-23-build/po/POTFILES.in
3> CYGWIN environment variable option "nodosfilewarning" turns off
this warning.
3> Consult the user's guide for more details about POSIX paths:
3> http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
Since these are only warning, I am not sure whether I should bother.
Daniel