FTP on debian bullseye

[JiffB]

Hi,
the C part compile right, but the app.src and erl not and unfortunately, there is no report that could give a lead to what's wrong :/

$ make
(cd argon2;make all;cd ..;cp argon2/libargon2.so.1 argon2/libargon2.a priv)
make[1]: Entering directory '/usr/local/lib/erlang/lib/eargon2/argon2'
Building with optimizations for native
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/usr/local/lib/erlang/lib/eargon2/argon2'
===> Verifying dependencies...
===> Compiling eargon2
make[1]: Entering directory '/usr/local/lib/erlang/lib/eargon2/c_src'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/usr/local/lib/erlang/lib/eargon2/c_src'
===> Compiling src/eargon2.erl failed
src/eargon2.erl:129: variable 'HashLen' is unused
src/eargon2.erl:129: variable 'MCost' is unused
src/eargon2.erl:129: variable 'Parallelism' is unused
src/eargon2.erl:129: variable 'Pwd' is unused
src/eargon2.erl:129: variable 'ResultType' is unused
src/eargon2.erl:129: variable 'Salt' is unused
src/eargon2.erl:129: variable 'TCost' is unused
src/eargon2.erl:129: variable 'Type' is unused
src/eargon2.erl:129: variable 'Version' is unused
src/eargon2.erl:143: variable 'Encoded' is unused
src/eargon2.erl:143: variable 'Pwd' is unused
src/eargon2.erl:143: variable 'Type' is unused
src/eargon2.erl:190: variable 'HashLen' is unused
src/eargon2.erl:190: variable 'MCost' is unused
src/eargon2.erl:190: variable 'Parallelism' is unused
src/eargon2.erl:190: variable 'Saltlen' is unused
src/eargon2.erl:190: variable 'TCost' is unused
src/eargon2.erl:190: variable 'Type' is unused

make: *** [Makefile:10: all] Error 1

Sooo, I could use a little help.