2018-01-02 17:11 GMT+01:00 Reino Wijnsma <rwijnsma at xs4all.nl>: > nasm: fatal: unable to open output file `/cygdrive/c/DOCUME~1/Admin/LOCALS~1/Temp/ffconf.Zrz2Fm8R/test.o' Is it possible that the binary you tested cannot read Cygwin paths? Carl Eugen