How to build DCD langserver on FreeBSD-arm64 (Raspberry PI 4)

[Alain De Vos]

After cloning the git source & running:
gmake:
Error

gmake ldc
find: msgpack-d/src/: No such file or directory
find: libdparse/src: No such file or directory
find: containers/src: No such file or directory
find: msgpack-d/src/: No such file or directory
git describe --tags > bin/githash.txt
ldc2 -Icontainers/src -Imsgpack-d/src -Ilibdparse/src 
-Idsymbol/src -Isrc -J=bin -O5 -release 
common/src/dcd/common/constants.d 
common/src/dcd/common/constants2.d 
common/src/dcd/common/dcd_version.d 
common/src/dcd/common/messages.d common/src/dcd/common/socket.d 
src/dcd/server/autocomplete/complete.d 
src/dcd/server/autocomplete/doc.d 
src/dcd/server/autocomplete/localuse.d 
src/dcd/server/autocomplete/package.d 
src/dcd/server/autocomplete/symbols.d 
src/dcd/server/autocomplete/ufcs.d 
src/dcd/server/autocomplete/util.d src/dcd/server/main.d 
src/dcd/server/server.d dsymbol/src/dsymbol/builtin/names.d 
dsymbol/src/dsymbol/builtin/symbols.d 
dsymbol/src/dsymbol/cache_entry.d 
dsymbol/src/dsymbol/conversion/first.d 
dsymbol/src/dsymbol/conversion/package.d 
dsymbol/src/dsymbol/conversion/second.d 
dsymbol/src/dsymbol/deferred.d dsymbol/src/dsymbol/import_.d 
dsymbol/src/dsymbol/modulecache.d dsymbol/src/dsymbol/scope_.d 
dsymbol/src/dsymbol/semantic.d 
dsymbol/src/dsymbol/string_interning.d 
dsymbol/src/dsymbol/symbol.d dsymbol/src/dsymbol/tests.d 
dsymbol/src/dsymbol/type_lookup.d    -oq -of=bin/dcd-server
common/src/dcd/common/messages.d(22): Error: module msgpack is in 
file 'msgpack.d' which cannot be read
import path[0] = containers/src
import path[1] = msgpack-d/src
import path[2] = libdparse/src
import path[3] = dsymbol/src
import path[4] = src
import path[5] = /usr/local/include/d