f77_f2c: 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/lib64/R/bin/f77_f2c - from package: R-core
/usr/lib/R/bin/f77_f2c - from package: R-core

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

On Debian possible default full paths are:

/usr/lib/R/bin/f77_f2c - from package: r-base-core

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

Error in other languages:
f77_f2c: bevel nie gevind nie
f77_f2c: comandă negăsită
f77_f2c: comando não encontrado
f77_f2c: commande introuvable
f77_f2c: command not found
f77_f2c: käsku ei ole
f77_f2c: không tìm thấy lệnh
f77_f2c: komanda nerasta
f77_f2c: Kommando nicht gefunden.
f77_f2c: kommandot finns inte
f77_f2c: komut yok
f77_f2c: nie znaleziono polecenia
f77_f2c: níor aimsíodh an t-ordú
f77_f2c: no se encontró la orden
f77_f2c: no s'ha trobat l'ordre
f77_f2c: opdracht niet gevonden
f77_f2c: parancs nem található
f77_f2c: perintah tidak ditemukan
f77_f2c: príkaz nenájdený
f77_f2c: příkaz nenalezen
f77_f2c: команда не найдена
f77_f2c: командата не е открита
f77_f2c: 命令找不到
f77_f2c: コマンドが見つかりません