mikmatch_pcre: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/mikmatch_pcre - from package: libmikmatch-ocaml-dev

You may install the required package with command apt-get install {package}

Error in other languages:
mikmatch_pcre: bevel nie gevind nie
mikmatch_pcre: comandă negăsită
mikmatch_pcre: comando não encontrado
mikmatch_pcre: commande introuvable
mikmatch_pcre: command not found
mikmatch_pcre: käsku ei ole
mikmatch_pcre: không tìm thấy lệnh
mikmatch_pcre: komanda nerasta
mikmatch_pcre: Kommando nicht gefunden.
mikmatch_pcre: kommandot finns inte
mikmatch_pcre: komut yok
mikmatch_pcre: nie znaleziono polecenia
mikmatch_pcre: níor aimsíodh an t-ordú
mikmatch_pcre: no se encontró la orden
mikmatch_pcre: no s'ha trobat l'ordre
mikmatch_pcre: opdracht niet gevonden
mikmatch_pcre: parancs nem található
mikmatch_pcre: perintah tidak ditemukan
mikmatch_pcre: príkaz nenájdený
mikmatch_pcre: příkaz nenalezen
mikmatch_pcre: команда не найдена
mikmatch_pcre: командата не е открита
mikmatch_pcre: 命令找不到
mikmatch_pcre: コマンドが見つかりません