fontforge: 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/fontforge - from package: fontforge

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

On Debian possible default full paths are:

/usr/bin/fontforge - from package: fontforge-nox
/usr/bin/fontforge - from package: fontforge

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

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