re2c: 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 CentOS possible default full paths are:

/usr/bin/re2c - from package: re2c

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/re2c - from package: re2c

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

Error in other languages:
re2c: bevel nie gevind nie
re2c: comandă negăsită
re2c: comando não encontrado
re2c: commande introuvable
re2c: command not found
re2c: käsku ei ole
re2c: không tìm thấy lệnh
re2c: komanda nerasta
re2c: Kommando nicht gefunden.
re2c: kommandot finns inte
re2c: komut yok
re2c: nie znaleziono polecenia
re2c: níor aimsíodh an t-ordú
re2c: no se encontró la orden
re2c: no s'ha trobat l'ordre
re2c: opdracht niet gevonden
re2c: parancs nem található
re2c: perintah tidak ditemukan
re2c: príkaz nenájdený
re2c: příkaz nenalezen
re2c: команда не найдена
re2c: командата не е открита
re2c: 命令找不到
re2c: コマンドが見つかりません