actually it give me that error into nagios, which I considere not understandable... could someone explain me what to do exactly and why is this happening ?

it does this error when I type the command "sudo make"....

make[2]: *** [check_http.o] Error 1
make[2]: Leaving directory `/home/nicadmin/nagios-plugins-1.4.16/plugins'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/nicadmin/nagios-plugins-1.4.16'
make: *** [all] Error 2