libMRML-config: 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/libMRML-config - from package: libmrml1-dev

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

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