There seems to be a yum dependency problem between rpm packages openssl-0.9.7a-43.17 and (newer?) openssl-0.9.7a-43.17.el4_6.1 in the SL 4.6 yum repositories. The first package was installed from the SL 4.5 yum repo, but the latter with the ".el4_6.1" ending seems to be the new naming scheme for the SL 4.6 yum repo. I manually updated the yum sl-base repo from 4.5 to 4.6. The ran "yum clean all" and "yum update" before trying to install openssl-devel. I think I will install openssl-devel from the SL 4.5 distro, and then try to yum update them to the "el4_6" rpm packages. We have SL4.6 x86_64 with openssl installed: [root@gryphon ~]# yum list openssl-devel openssl-* Loading "kernel-module" plugin Loading "tsflags" plugin Loading "changelog" plugin Loading "dellsysidplugin" plugin Setting up repositories Reading repository metadata in from local files Installed Packages openssl.x86_64 0.9.7a-43.17.1 installed openssl.i686 0.9.7a-43.17.1 installed openssl-perl.x86_64 0.9.7a-43.17.1 installed Available Packages openssl.x86_64 0.9.7a-43.17.el4_6.1 sl-base openssl.i686 0.9.7a-43.17.el4_6.1 sl-base openssl-devel.i386 0.9.7a-43.17.el4_6.1 sl-base openssl-devel.x86_64 0.9.7a-43.17.el4_6.1 sl-base openssl-perl.x86_64 0.9.7a-43.17.el4_6.1 sl-base We tried to install openssl-devel rpm package via yum: [root@gryphon ~]# yum install openssl-devel Loading "kernel-module" plugin Loading "tsflags" plugin Loading "changelog" plugin Loading "dellsysidplugin" plugin Setting up Install Process Setting up repositories Reading repository metadata in from local files Parsing package install arguments Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Package openssl-devel.x86_64 0:0.9.7a-43.17.el4_6.1 set to be updated ---> Package openssl-devel.i386 0:0.9.7a-43.17.el4_6.1 set to be updated --> Running transaction check --> Processing Dependency: openssl = 0.9.7a-43.17.el4_6.1 for package: openssl-devel --> Finished Dependency Resolution Beginning Kernel Module Plugin Finished Kernel Module Plugin Error: Missing Dependency: openssl = 0.9.7a-43.17.el4_6.1 is needed by package openssl-devel So then I tried to update openssl via yum: [root@gryphon ~]# yum update openssl Loading "kernel-module" plugin Loading "tsflags" plugin Loading "changelog" plugin Loading "dellsysidplugin" plugin Setting up Update Process Setting up repositories Reading repository metadata in from local files Could not find update match for openssl No Packages marked for Update/Obsoletion PS We encountered similar problems trying to install openldap-devel package. -- Chris Hunter [log in to unmask]