in fact you can install it by some command line
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first install epel and disable it
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yum install http://mirror.de-labrusse.fr/NethServer/6/noarch/nethserver-stephdl-1.0.0-1.ns6.noarch.rpm
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yum install nethserver-remi-phpscl --enablerepo=stephdl
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yum install nethserver-php-scl --enablerepo=stephdl,remi-phpscl,epel