New to LBM and OpenLB? Attend our upcoming one-week hands-on Spring School in Marseille/France from 19.05.2025 – 23.05.2025. OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Cannot compile the examples using “make” with Cygwin (no object file) › Re: Cannot compile the examples using “make” with Cygwin (no object file) June 14, 2016 at 6:49 pm #2379 mathiasKeymaster It seems a windows/unix problem. I found this put in the beginning “”#define _BSD_SOURCE””. See also http://stackoverflow.com/questions/36901803/gettimeofday-not-declared-in-this-scope-cygwin .