I'm attempting to build an older version of Chromium (64.0.3282.123) on Linux. Running gn args out/Default produces the error
Generating files...
ERROR at //build/config/BUILDCONFIG.gn:495:1: Unknown function.
set_sources_assignment_filter(sources_assignment_filter)
^----------------------------
My build arguments are
is_debug = false
is_clang = true
symbol_level = 2
dcheck_always_on = false
is_component_build = false
target_os = "android"
target_cpu = "arm64"
blink_symbol_level = 0
v8_symbol_level = 0
ignore_elf32_limitations = true