I am running redhat 5.11 Linux, probably this command is not supported. Although I have manually compiled latest perl version -bash-3.2$ perl -v This is perl 5, version 36, subversion 0 (v5.36.0) built for x86_64-linux -bash-3.2$ perl Configure LIST Can't open perl script "Configure": No such file or directory -bash-3.2$ perl configure LIST Can't open perl script "configure": No such file or directory Regards, Gaurav Mittal -----Original Message----- From: Matt Caswell <matt@xxxxxxxxxxx> Sent: 23 June 2022 02:56 PM To: Gaurav Mittal11 <gaurav.mittal@xxxxxxxxxx>; openssl-users@xxxxxxxxxxx Subject: [EXTERNAL] Re: Openssl upgrade to 1.1.1o on Red Linux 5.11 On 22/06/2022 15:32, Gaurav Mittal11 wrote: > This system (linux-x86_64) is not supported. See file INSTALL for details. That is very odd. I would expect linux-x86_64 to always be reported as supported by config. Do you get sensible output from: $ perl Configure LIST You should see a list of all the platforms - one of which should be "linux-x86_64" Matt