[exim] exim-4.92RC1 on Ubuntu 18.04

Hola!

It's actually my very first time to manually compile anything on Linux so I
request for help.
I am trying to compile the RC on Ubuntu 18.04.1 and it fails as below,
which I cannot make head or tails on since I am not such a Linux guy!

.....
gcc lookups/lf_quote.c
gcc lookups/lf_check_file.c
gcc lookups/lf_sqlperform.c
gcc local_scan.c
gcc version.c
gcc -o exim
smtp_in.o: In function `smtp_start_session':
smtp_in.c:(.text+0x3f15): undefined reference to `hosts_ctl'
collect2: error: ld returned 1 exit status
Makefile:661: recipe for target 'exim' failed
make[1]: *** [exim] Error 1
make[1]: Leaving directory '/home/wash/exim-4.92-RC1/build-Linux-x86_64'
Makefile:35: recipe for target 'all' failed
make: *** [all] Error 2
root@lists:/home/wash/exim-4.92-RC1#

--
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254 7 3200 0004/+254 7 2274 3223
"Oh, the cruft."