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

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

On Debian possible default full paths are:

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

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

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