Add dependency instructions

Author: robinst

README.md

@@ -28,7 +28,7 @@ Before you install the gem, make sure to have [taglib 1.11.1 or higher][taglib]
 with header files (and a C++ compiler of course):
 
 * Debian/Ubuntu: `sudo apt-get install libtag1-dev`
-* Fedora/RHEL: `sudo yum install taglib-devel`
+* Fedora/RHEL: `sudo dnf install taglib-devel`
 * Brew: `brew install taglib`
 * MacPorts: `sudo port install taglib`
 
@@ -60,6 +60,12 @@ See {file:CHANGES.md}.
 Contributing
 ------------
 
+### Dependencies
+
+Fedora:
+
+    sudo dnf install taglib-devel ruby-devel gcc-c++ redhat-rpm-config swig
+
 ### Building
 
 Install dependencies (uses bundler, install it via `gem install bundler`

ext/extconf_common.rb

@@ -42,7 +42,7 @@ def error msg
 You must have taglib installed in order to use taglib-ruby.
 
 Debian/Ubuntu: sudo apt-get install libtag1-dev
-Fedora/RHEL: sudo yum install taglib-devel
+Fedora/RHEL: sudo dnf install taglib-devel
 Brew: brew install taglib
 MacPorts: sudo port install taglib
 DESC