Unable to configure

When doing config I get this error

checking for strcasecmp... yes
checking for strdup... yes
checking for strerror... yes
checking for strncasecmp... yes
checking for strtol... yes
checking for strtoul... yes
checking for uname... yes
checking for atexit... yes
checking for getcwd... yes
checking for strstr... yes
checking for setsockopt... yes
checking for bind... yes
checking for clock_gettime in -lrt... yes
checking for clock_gettime... yes
checking for pkg-config... /usr/bin/pkg-config
checking whether compiling and linking against OpenSSL works... yes
checking cyassl/ssl.h usability... no
checking cyassl/ssl.h presence... no
checking for cyassl/ssl.h... no
no
checking libmemcached-1.0/memcached.h usability... no
checking libmemcached-1.0/memcached.h presence... no
checking for libmemcached-1.0/memcached.h... no
checking test for a working libevent... no
configure: error: Unable to find libevent