$ rpm -qi libIDL <--- this is the installed x86_64 version

Name        : libIDL                       Relocations: (not relocatable)
Version     : 0.8.4                             Vendor: CentOS
Release     : 1.centos4                     Build Date: Di 11 Okt 2005 02:26:00 CEST
Install Date: So 01 Apr 2007 21:47:19 CEST      Build Host: monk.karan.org
Group       : System Environment/Libraries   Source RPM: libIDL-0.8.4-1.centos4.src.rpm
Size        : 203096                           License: LGPL
Signature   : DSA/SHA1, Di 11 Okt 2005 04:24:46 CEST, Key ID a53d0bab443e1821
Packager    : Karanbir Singh <kbsingh@centos.org>
Summary     : Library for parsing IDL (Interface Definition Language)
Description :
libIDL is a library for parsing IDL (Interface Definition Language).
It can be used for both COM-style and CORBA-style IDL.


$ rpm -qip libIDL-0.8.4-1.i386.rpm <--- obviously the i386 version
Name        : libIDL                       Relocations: (not relocatable)
Version     : 0.8.4                             Vendor: CentOS
Release     : 1                             Build Date: Mo 21 Feb 2005 21:04:06 CET
Install Date: (not installed)               Build Host: agni.build.karan.org
Group       : System Environment/Libraries   Source RPM: libIDL-0.8.4-1.src.rpm
Size        : 191060                           License: LGPL
Signature   : DSA/SHA1, Sa 26 Feb 2005 21:57:24 CET, Key ID a53d0bab443e1821
Packager    : Karanbir Singh <kbsingh@centos.org>
Summary     : Library for parsing IDL (Interface Definition Language)
Description :
libIDL is a library for parsing IDL (Interface Definition Language).
It can be used for both COM-style and CORBA-style IDL.