In Life with qmail i read: Note: Under some versions of Linux, such as Red Hat 7, you'll probably receive an error during the make step like: ./compile tai64nlocal.c tai64nlocal.c: In function `main': tai64nlocal.c:54: warning: assignment makes pointer from integer without a cast tai64nlocal.c:55: dereferencing pointer to incomplete type etc... To fix this, edit tai64nlocal.c and change the second line from: #include <sys/time.h> to: #include <time.h> Thanks anyway =)