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/usr/lib/mysql-testsuite/include/load_sysvars.inc is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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#
# This script is included by tests of system variables to include system
# dependant values for the variables: default, minimum and maximum values
#

if (`SELECT convert(@@version_compile_os using latin1)
            IN ('Win32','Win64','Windows')`)
{
   --source include/windows_sys_vars.inc
}
if (!`SELECT convert(@@version_compile_os using latin1)
             IN ('Win32','Win64','Windows')`)
{
   --source include/linux_sys_vars.inc
}