Packages for RHEL are in EPEL repo.

System-configuration.md

@@ -16,20 +16,22 @@ deb-src http://ftp.cz.debian.org/debian/ testing contrib non-free
 ```
 $ sudo apt-get -t testing install gcc
 ```
+**Add EPEL repository to RHEL**
+- See [this](https://fedoraproject.org/wiki/EPEL) for instructions.
 
 **Install ZeroMQ** in version at least 4.0
 - For Debian, run
 ```
 $ sudo apt-get install libzmq3-dev
 ```
-- For Fedora (Red Hat), install `zeromq` and `zeromq-devel` (_or if not reachable probably [this](http://cbs.centos.org/koji/buildinfo?buildID=4716_).
+- For Fedora (Red Hat), install `zeromq` and `zeromq-devel` (on RHEL from EPEL repository).
 
 **Install YAML-CPP library**
 - For Debian:
 ```
 $ sudo apt-get install libyaml-cpp0.5v5 libyaml-cpp-dev
 ```
-- For Fedora (Red Hat), install `yaml-cpp` and `yaml-cpp-devel` packages.
+- For Fedora (Red Hat), install `yaml-cpp` and `yaml-cpp-devel` packages (on RHEL from EPEL repository).
 
 **Install libcurl library**
 - For Debian: