hmm2build: command not found

Have You tried accessing the binary with the full path?

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/hmm2build - from package: hmmer2

You may install the required package with command apt-get install {package}
Error in other languages:
hmm2build: bevel nie gevind nie
hmm2build: comandă negăsită
hmm2build: comando não encontrado
hmm2build: commande introuvable
hmm2build: command not found
hmm2build: käsku ei ole
hmm2build: không tìm thấy lệnh
hmm2build: komanda nerasta
hmm2build: Kommando nicht gefunden.
hmm2build: kommandot finns inte
hmm2build: komut yok
hmm2build: nie znaleziono polecenia
hmm2build: níor aimsíodh an t-ordú
hmm2build: no se encontró la orden
hmm2build: no s'ha trobat l'ordre
hmm2build: opdracht niet gevonden
hmm2build: parancs nem található
hmm2build: perintah tidak ditemukan
hmm2build: príkaz nenájdený
hmm2build: příkaz nenalezen
hmm2build: команда не найдена
hmm2build: командата не е открита
hmm2build: 命令找不到
hmm2build: コマンドが見つかりません