Nagios Trouble Shooting Tutorial


While compiling Nagios plugins, you may get an error regarding the SSL version; it requires to install the OpenSSL on the Linux box.

check_http.c:312:9: error: ‘ssl_version’ undeclared (first use in this function)

make[2]: *** [check_http.o] Error 1

make[2]: Leaving directory `/usr/local/src/nagios-plugins-1.4.16/plugins’

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/usr/local/src/nagios-plugins-1.4.16′

make: *** [all] Error 2


Install the following RPM’s

yum install openssl*

Once this is installed , you will be able to compile the plugins without any issue.

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