bison.yacc: 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/bison.yacc - from package: bison

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

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