FreePBX and gcc-c++

[PCXLan.es (Jon)]

NethServer Version: NethServer 7.9.2009 (final)
Module: FreePBX

I keep playing around with VoIP and FreePBX a bit and when trying to install the User Control Panel and WebRTC modules FreePBX ends up with this error:

gcc-c ++ is not installed
Error (s) installing ucp:
Error running installation scripts

Reading a bit through the forum, I have found

7.5 update 7.6 Confused repositorys and PBX cant find gcc-cc++

Hi one week ago i am installing fresh Nethserver 7.5. Today i let run a update via yum. Now it is running System Version NethServer release 7.6.1810 (final) Kernel 3.10.0-957.1.3.el7.x86_64. For some freepbx modules i need a gcc. Than i try yum instal gcc. Thats ending with erros … gcc-4.8.5-36.el7.x86_64.rpm FAILED http://vault.centos.org/7.5.1804/os/x86_64/Packages/gcc-4.8.5-36.el7.x86_64.rpm: [Errno 14] HTTP Error 404 - Not Found-:-- ETA But OS iss CentOS Linux release 7.6.1810 (Co…

and I have executed

yum install gcc-c++

But when installing it tells me to install these dependencies as well

> [root@server ~]# yum install gcc-c++
> Loaded plugins: changelog, fastestmirror, nethserver_events
> Loading mirror speeds from cached hostfile
>  * ce-base: mirrors.prometeus.net
>  * ce-extras: mirrors.prometeus.net
>  * ce-sclo-rh: mirrors.prometeus.net
>  * ce-sclo-sclo: mirrors.prometeus.net
>  * ce-updates: mirrors.prometeus.net
>  * epel: mirror.nextlayer.at
>  * nethforge: ketrax.eu
>  * nethserver-base: ketrax.eu
>  * nethserver-updates: ketrax.eu
>  * remi-safe: remirepo.reloumirrors.net
> Resolving Dependencies
> --> Running transaction check
> ---> Package gcc-c++.x86_64 0:4.8.5-44.el7 will be installed
> --> Processing Dependency: libstdc++-devel = 4.8.5-44.el7 for package: gcc-c++-4                                                                                                             .8.5-44.el7.x86_64
> --> Processing Dependency: gcc = 4.8.5-44.el7 for package: gcc-c++-4.8.5-44.el7.                                                                                                             x86_64
> --> Processing Dependency: libmpc.so.3()(64bit) for package: gcc-c++-4.8.5-44.el                                                                                                             7.x86_64
> --> Running transaction check
> ---> Package gcc.x86_64 0:4.8.5-44.el7 will be installed
> --> Processing Dependency: cpp = 4.8.5-44.el7 for package: gcc-4.8.5-44.el7.x86_                                                                                                             64
> --> Processing Dependency: glibc-devel >= 2.2.90-12 for package: gcc-4.8.5-44.el                                                                                                             7.x86_64
> ---> Package libmpc.x86_64 0:1.0.1-3.el7 will be installed
> ---> Package libstdc++-devel.x86_64 0:4.8.5-44.el7 will be installed
> --> Running transaction check
> ---> Package cpp.x86_64 0:4.8.5-44.el7 will be installed
> ---> Package glibc-devel.x86_64 0:2.17-323.el7_9 will be installed
> --> Processing Dependency: glibc-headers = 2.17-323.el7_9 for package: glibc-dev                                                                                                             el-2.17-323.el7_9.x86_64
> --> Processing Dependency: glibc-headers for package: glibc-devel-2.17-323.el7_9                                                                                                             .x86_64
> --> Running transaction check
> ---> Package glibc-headers.x86_64 0:2.17-323.el7_9 will be installed
> --> Processing Dependency: kernel-headers >= 2.2.1 for package: glibc-headers-2.                                                                                                             17-323.el7_9.x86_64
> --> Processing Dependency: kernel-headers for package: glibc-headers-2.17-323.el                                                                                                             7_9.x86_64
> --> Running transaction check
> ---> Package kernel-headers.x86_64 0:3.10.0-1160.15.2.el7 will be installed
> --> Finished Dependency Resolution
> 
> Dependencies Resolved
> 
> ================================================================================
>  Package             Arch       Version                    Repository      Size
> ================================================================================
> Installing:
>  gcc-c++             x86_64     4.8.5-44.el7               ce-base        7.2 M
> Installing for dependencies:
>  cpp                 x86_64     4.8.5-44.el7               ce-base        5.9 M
>  gcc                 x86_64     4.8.5-44.el7               ce-base         16 M
>  glibc-devel         x86_64     2.17-323.el7_9             ce-updates     1.1 M
>  glibc-headers       x86_64     2.17-323.el7_9             ce-updates     691 k
>  kernel-headers      x86_64     3.10.0-1160.15.2.el7       ce-updates     9.0 M
>  libmpc              x86_64     1.0.1-3.el7                ce-base         51 k
>  libstdc++-devel     x86_64     4.8.5-44.el7               ce-base        1.5 M
> 
> Transaction Summary
> ================================================================================
> Install  1 Package (+7 Dependent packages)
> 
> Total download size: 42 M
> Installed size: 84 M

Can I safely upgrade a server in production?
Thanks for your help!