The following include is missing in gecode/support/thread/pthreads.hpp causing compilation to fail for me (unknown sleep(3) and usleep(3)) in both 3.1.0 and trunk:
#ifdef GECODE_HAS_UNISTD_H
#include <unistd.h>
#endif
or perhaps more correctly:
#ifdef GECODE_HAS_UNISTD_H
extern "C" {
#include <unistd.h>
}
#endif
--Denys
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