lhapdf-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 CentOS possible default full paths are:

/usr/bin/lhapdf-config - from package: lhapdf-devel

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

On Debian possible default full paths are:

/usr/bin/lhapdf-config - from package: liblhapdf-dev

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

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