Verilog-AMS Syntax Recognition Failure

[Snaredrumhero]

I'm trying to get this basic resistor module working in iverilog using the -g verilog-ams compiler flag, but it looks like the compiler isn't able to recognize some of the basic verilog-ams terms like electrical and branch. I am using Icarus Verilog version 13.0 (devel) (v12_0) on WSL Ubuntu 22.04.5 LTS

module resistor (t1, t2);
electrical t1, t2;
parameter real r=1;
branch (t1, t2) res;

analog V(res) <+ r*I(res);
endmodule

I've tried running this code under the v12-branch and verilog-ams branches to no avail (the make command failed for ams, so I couldn't really test it).
Do I need to install something extra to run verilog-ams code? From the documentation, it sounded like these functions should already be supported by using the flag.

[caryr]

Verilog-A support is very limited. I now contribution statements are not currently supported. Branch may also not be supported. Electrical should be supported by including disciplines.vams

[Snaredrumhero]

Thank you for the quick response. I tried including disciplines.vams, but it's looking like it can't read the library.