dcl2inc: 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/dcl2inc - from package: ftnchek

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

On Debian possible default full paths are:

/usr/bin/dcl2inc - from package: ftnchek

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

Error in other languages:
dcl2inc: bevel nie gevind nie
dcl2inc: comandă negăsită
dcl2inc: comando não encontrado
dcl2inc: commande introuvable
dcl2inc: command not found
dcl2inc: käsku ei ole
dcl2inc: không tìm thấy lệnh
dcl2inc: komanda nerasta
dcl2inc: Kommando nicht gefunden.
dcl2inc: kommandot finns inte
dcl2inc: komut yok
dcl2inc: nie znaleziono polecenia
dcl2inc: níor aimsíodh an t-ordú
dcl2inc: no se encontró la orden
dcl2inc: no s'ha trobat l'ordre
dcl2inc: opdracht niet gevonden
dcl2inc: parancs nem található
dcl2inc: perintah tidak ditemukan
dcl2inc: príkaz nenájdený
dcl2inc: příkaz nenalezen
dcl2inc: команда не найдена
dcl2inc: командата не е открита
dcl2inc: 命令找不到
dcl2inc: コマンドが見つかりません