message: centos/RHEL 7  build instructions added
diff: @@ -108,6 +108,16 @@ missing, please open an issue.
  dnf install cmake freetype-devel fontconfig-devel xclip
  ```
  +#### CentOS/RHEL 7
  +
  +On CentOS/RHEL 7, you need a few extra libraries to build Alacritty. Here's a `yum`
  +command that should install all of them. If something is still found to be
  +missing, please open an issue.
  +
  +```sh
  +yum install cmake freetype-devel fontconfig-devel xclip
  +```
  +
  #### openSUSE
  On openSUSE, you need a few extra libraries to build Alacritty. Here's
  