Nagios Plugin Installation Error

While installing nagios plugins, we got this error, simply install openssl-devel rpm.

"check_http.c:312: error: âssl_versionâ undeclared (first use in this function)
check_http.c:312: error: (Each undeclared identifier is reported only once
check_http.c:312: error: for each function it appears in.)
make[2]: *** [check_http.o] Error 1
make[2]: Leaving directory `/opt/nagios-plugins-1.4.16/plugins'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/opt/nagios-plugins-1.4.16'
make: *** [all] Error 2
"