If you're trying to compile ices and get this error:

span class="st0">'t find libshout. Try adjusting PKG_CONFIG_PATH.
checking for shout-config… no
configure: error: Could not find a usable libshout

And you swear you've already installed libshout and libshout-devel, then you need to install libtheora and libtheora-devel. Yes, the error message is misleading.