I see the libXpm-devel rpm here, but not for CentOS 4.x
http://rpmfind.net/linux/rpm2html/search.php?query=libxpm-devel
And here is one for the i386 platform. Is that good?
ftp://rpmfind.net/linux/fedora/core/development/i386/os/Fedora/libXpm-devel-3.5.6-1.i386.rpm
Just found this one for CentOS
http://rpm.pbone.net/index.php3/stat/4/idpl/4066720/com/libXpm-devel-3.5.5-3...