/usr/local/src/etherCAT_Master_1.5/master/ethernet.h:42:29: linux/semaphore.h: File or Folder not found

make[3]: *** [/usr/local/src/etherCAT_Master_1.5/master/cdev.o] Error 1

make[2]: *** [/usr/local/src/etherCAT_Master_1.5/master] Error 2

make[1]: *** [_module_/usr/local/src/etherCAT_Master_1.5] Error 2

make[1]: Leaving directory `/usr/src/linux-2.6.25'

make: *** [modules] Error 2