Why does the Quartus II installer ask for 32-bit libraries that I already have?

Due to a problem in the installation script of the Quartus® II software version 12.0, the installer is unable to correctly detect some installed 32-bit libraries in RedHat 5 or CentOS 5 operating systems. Due to this problem, the Quartus II installation script prompts the user to install the missing required 32-bit libraries even though they are already installed on the system.

To work around this problem, perform one of the following two steps:

• If you know that the 32-bit libraries are already installed, enter y to ignore the warning and proceed with the installation. To see a list of installed libraries, run

  yum list glibc libXext libX11 libXau libXdmcp freetype fontconfig expat

• Alternatively, download this setup file and replace the one in the unpackaged directories. If you are using the standalone installer or the ISO, run ./setup to continue with the installation. If you are using the altera_installer.external.sh, perform the following steps:
1. Replace the setup script in the ./bin directory
2. change directory to the ./bin directory
3. Run export PATH=./:/build2/install/mongodb/bin:/usr/lib64/qt-3.3/bin:/usr/NX/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/jchang/bin for sh-style shells or setenv PATH=./:/build2/install/mongodb/bin:/usr/lib64/qt-3.3/bin:/usr/NX/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/jchang/bin for csh-style shells
4. Run ./setup

This error is fixed beginning with the Quartus II software version 12.0 SP1.