After updateing: FreeBSD ah-customers 11.1-RELEASE FreeBSD 11.1-RELEASE #0 r321309: Fri Jul 21 02:08:28 UTC 2017 root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 I have three FreeBSD machines and I see this error on two of them, I updated all three the same way. I have no idea what is going on there.
(In reply to Gerd from comment #0) FreeBSD 11.1 is no longer supported since September 30, 2018 and packages are now built for FreeBSD 11.2 which has libdl.so. Please update to FreeBSD 11.2.
Alternatively, building from source does not have this problems even on 11.x.
My buddy had the same problem with 'node' package on 11.1. Copying the /usr/lib/libdl.so.1 from FreeBSD 11.2 system to that 11.1 system into the same /usr/lib/libdl.so.1 place helped. Its VERY unsupported solution so its better upgrade then do that but when really fast (not best) solution is needed - then it works too. Regards, vermaden