otfmerge-mpi: 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/otfmerge-mpi - from package: otf-trace

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

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