Mikrotik Version Test 6.41

:global version [/system resource get version ]
:local vMajor;
:local vMinor;

# split the version apart so you can compare them
:for i from=0 to=([:len $myVer] - 1) do={
	:if ( [:pick $myVer $i] = ".") do={
		:set vMajor [:tonum [:pick $myVer 0 $i]];
		:set vMinor [:tonum [:pick $myVer ($i + 1) [:len $myVer]]] ;
	}
}

:log info "RouterOs version is $vMajor.$vMinor";

# now do the compare and change it to easy to use variable
:if ($vMajor < 4) do={
	#check minor version
	:if ($vMinor >= 41) do={
		:global vtest = 1;
	} else={
		:global vtest = 0;
	}
} else={
	:log warning "Router Os version is not a 4.0 branch it is $vMajor.$vMinor, config script is not compatible;
}

# now the vtest variable can be used each time you need to change based on version

:if ($vtest = 1) do={
	/ip neighbor discovery-settings set discover-interface-list=LAN;
} else={
	/ip neighbor discovery set 0 discover=no;
}