I am trying to build NxLog Comminity edition on Centos 6.10 w/ X64_86 target and found there are five dependencies packages - pr-util.x86_64 apr-util-devel.x86_64 pcre-devel.x86_64 openssl-devel.x86_64 perl-ExtUtils-Embed. Does anyone know where to download the source code for these 5 dependent packages and how to build under centos 6.10 environment? Thanks.