icmp in Delphi6

I'm using icmp from Andreas Hörstemeier in Delphi6 and it will compile and run in the IDE but when I try to build the project I get the following error:


[Error] ICMP.PAS(532): Left side cannot be assigned to



 ticmp_sendblock(requestdata^).icmp_header.icmp_type := ICMP_ECHO;
    ticmp_sendblock(requestdata^).icmp_header.icmp_code := 0;
    ticmp_sendblock(requestdata^).icmp_header.icmp_cksum := 0;
    ticmp_sendblock(requestdata^).icmp_header.icmp_seq := f_packet_no;
    inc(f_packet_no);     {  LINE 532   }
    ticmp_sendblock(requestdata^).icmp_header.icmp_id := word(self);
    fillchar(ticmp_sendblock(requestdata^).data,f_blocksize,#$a7);
    ticmp_sendblock(requestdata^).time:=now_ms;
    ticmp_sendblock(requestdata^).icmp_header.icmp_cksum := ICMP_checksum(requestdata^,rq_size);
    whereto_len:=sizeof(whereto);



Is anyone using this VCL in version 6, If so what is the workaround.  I tried to change it but everything I try fails.


Thanks