gurami on desktop ~ took 0s 
✗ nix build github:aaronjheng/nixpkgs/antlr4#antlr4_11

gurami on desktop ~ took 48s 
➜ ./result/bin/antlr 
ANTLR Parser Generator  Version 4.11.1
 -o ___              specify output directory where all output is generated
 -lib ___            specify location of grammars, tokens files
 -atn                generate rule augmented transition network diagrams
 -encoding ___       specify grammar file encoding; e.g., euc-jp
 -message-format ___ specify output style for messages in antlr, gnu, vs2005
 -long-messages      show exception details when available for errors and warnings
 -listener           generate parse tree listener (default)
 -no-listener        don't generate parse tree listener
 -visitor            generate parse tree visitor
 -no-visitor         don't generate parse tree visitor (default)
 -package ___        specify a package/namespace for the generated code
 -depend             generate file dependencies
 -D<option>=value    set/override a grammar-level option
 -Werror             treat warnings as errors
 -XdbgST             launch StringTemplate visualizer on generated code
 -XdbgSTWait         wait for STViz to close before continuing
 -Xforce-atn         use the ATN simulator for all predictions
 -Xlog               dump lots of logging info to antlr-timestamp.log
 -Xexact-output-dir  all output goes into -o dir regardless of paths/package

Link to currently reviewing PR:
https://github.com/NixOS/nixpkgs/pull/451891
--------- Report for 'x86_64-linux' ---------
4 packages built:
luaformatter mysql-shell mysql-shell-innovation nixpkgs-manual