Let's warn about binary needed for `install` target. Before: [root@localhost criu]# make install GEN crit.1 make[1]: *** [Makefile:49: crit.1] Error 127 make: *** [Makefile.install:32: install-man] Error 2 After: [root@localhost criu]# make install /bin/sh: line 1: xmlto: command not found make[1]: *** [Makefile:32: check] Error 1 make: *** [Makefile.install:32: install-man] Error 2 Fixes: #481 Reported-by: [email protected] Signed-off-by: Dmitry Safonov <[email protected]> Signed-off-by: Andrei Vagin <[email protected]>