Hi I'm clearly missing something obvious but it's passed me by what that might be, so a pointer would be appreciated... Tried running yum update on my centos7 box. Get the following: Error: Package: postgresql12-devel-12.5-1PGDG.rhel7.x86_64 (postgresql_12) Requires: llvm5.0-devel >= 5.0 SCLO is enabled and it happily installs llvm7-toolset (and its various subs) from there. But yum install llvm5.0-devel simply returns "No package llvm5.0-devel available" There's suggestions in the mailing list archives that actually this is resolved by installing llvm7-devel package but it's not. # yum list installed | grep llvm llvm-toolset-7-clang.x86_64 5.0.1-4.el7 @sclo llvm-toolset-7-clang-libs.x86_64 5.0.1-4.el7 @sclo llvm-toolset-7-compiler-rt.x86_64 5.0.1-2.el7 @sclo llvm-toolset-7-libomp.x86_64 5.0.1-2.el7 @sclo llvm-toolset-7-llvm.x86_64 5.0.1-8.el7 @sclo llvm-toolset-7-llvm-devel.x86_64 5.0.1-8.el7 @sclo llvm-toolset-7-llvm-libs.x86_64 5.0.1-8.el7 @sclo llvm-toolset-7-runtime.x86_64 5.0.1-4.el7 @sclo llvm-toolset-7.0.x86_64 7.0.1-2.el7 @sclo llvm-toolset-7.0-clang.x86_64 7.0.1-1.el7 @sclo llvm-toolset-7.0-clang-libs.x86_64 7.0.1-1.el7 @sclo llvm-toolset-7.0-compiler-rt.x86_64 7.0.1-3.el7 @sclo llvm-toolset-7.0-libomp.x86_64 7.0.1-2.el7 @sclo llvm-toolset-7.0-lld.x86_64 7.0.1-2.el7 @sclo llvm-toolset-7.0-lld-libs.x86_64 7.0.1-2.el7 @sclo llvm-toolset-7.0-lldb.x86_64 7.0.1-1.el7 @sclo llvm-toolset-7.0-llvm.x86_64 7.0.1-4.el7 @sclo llvm-toolset-7.0-llvm-devel.x86_64 7.0.1-4.el7 @sclo llvm-toolset-7.0-llvm-libs.x86_64 7.0.1-4.el7 @sclo llvm-toolset-7.0-python2-lit.noarch 0.7.1-1.el7 @sclo llvm-toolset-7.0-runtime.x86_64 7.0.1-2.el7 @sclo I tried adding the EPEL repo just in case that was the issue but it hasn't made any difference. Thanks Geoff