ftmemchk: 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/ftmemchk - from package: freetype-demos

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

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