MySQL is installed, yet configure fails when looking for MySQL

mysql> status;
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mysql Ver 14.14 Distrib 5.5.47, for debian-linux-gnu (armv7l) using readline 6.2

Connection id: 54
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.47-0+deb7u1 (Debian)
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /var/run/mysqld/mysqld.sock
Uptime: 22 hours 55 min 11 sec

Threads: 1 Questions: 4508 Slow queries: 0 Opens: 733 Flush tables: 2 Open tables: 58 Queries per second avg: 0.054
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mysql>

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checking for long long format... no
checking for -rdynamic linking option... yes
checking for libperfstat 5.2.0.40 fileset... no
checking for libperfstat 5.3.0.60 fileset... no
checking for architecture... linux (linux-gnueabihf)
checking for the linux kernel version... unknown family (4.1.13-v7+)
checking size of void *... 4
checking for mysql_config... no
configure: error: MySQL library not found
root@AVION:/home/pi/Zabbix/zabbix-3.0.1#

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root@AVION:/home/pi/Zabbix/zabbix-3.0.1# set
BASH=/bin/bash
BASHOPTS=checkwinsize:cmdhist:expand_aliases:extquote:force_fignore:hostcomplete:interactive_comments:progcomp:promptvars:sourcepath
BASH_ALIASES=()
BASH_ARGC=()
BASH_ARGV=()
BASH_CMDS=()
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=([0]="4" [1]="2" [2]="37" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
BASH_VERSION='4.2.37(1)-release'
COLUMNS=184
DIRSTACK=()
EUID=0
GROUPS=()
HISTFILE=/root/.bash_history
HISTFILESIZE=500
HISTSIZE=500
HOME=/root
HOSTNAME=AVION
HOSTTYPE=arm
IFS=$' \t\n'
LANG=en_GB.UTF-8
LD_LIBRARY_PATH=/usr/local/lib
LINES=39
LOGNAME=root
LS_COLORS='rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:.tar=01;31:.tgz=01;31:.arj=01;31:.taz=01;31:.lzh=01;31:.lzma=01;31:.tlz=01;31:.txz=01;31:.zip=01;31:.z=01;31:.Z=01;31:.dz=01;31:.gz=01;31:.lz=01;31:.xz=01;31:.bz2=01;31:.bz=01;31:.tbz=01;31:.tbz2=01;31:.tz=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.war=01;31:.ear=01;31:.sar=01;31:.rar=01;31:.ace=01;31:.zoo=01;31:.cpio=01;31:.7z=01;31:.rz=01;31:.jpg=01;35:.jpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.svg=01;35:.svgz=01;35:.mng=01;35:.pcx=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.m2v=01;35:.mkv=01;35:.webm=01;35:.ogm=01;35:.mp4=01;35:.m4v=01;35:.mp4v=01;35:.vob=01;35:.qt=01;35:.nuv=01;35:.wmv=01;35:.asf=01;35:.rm=01;35:.rmvb=01;35:.flc=01;35:.avi=01;35:.fli=01;35:.flv=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.yuv=01;35:.cgm=01;35:.emf=01;35:.axv=01;35:.anx=01;35:.ogv=01;35:.ogx=01;35:.aac=00;36:.au=00;36:.flac=00;36:.mid=00;36:.midi=00;36:.mka=00;36:.mp3=00;36:.mpc=00;36:.ogg=00;36:.ra=00;36:.wav=00;36:.axa=00;36:.oga=00;36:.spx=00;36:.xspf=00;36:'
MACHTYPE=arm-unknown-linux-gnueabihf
MAIL=/var/mail/root
MAILCHECK=60
OLDPWD=/home/pi/Zabbix/zabbix-3.0.1/database
OPTERR=1
OPTIND=1
OSTYPE=linux-gnueabihf
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PIPESTATUS=([0]="1")
PPID=25723
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
PS2='> '
PS4='+ '
PWD=/home/pi/Zabbix/zabbix-3.0.1
SHELL=/bin/bash
SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
SHLVL=1
SUDO_COMMAND=/bin/bash
SUDO_GID=1000
SUDO_UID=1000
SUDO_USER=pi
TERM=xterm
UID=0
USER=root
USERNAME=root
_=--with-libxml2