Specify potential values for SERENITY_ARCH
MODIFY
build_config/serenity.rb
build_config/serenity.rb
#
# Should be built using the SerenityOS Ports system
# https://github.com/SerenityOS/serenity/tree/master/Ports
+#
+# As of 2021/08/20, SERENITY_ARCH is defined in the SerenityOS Ports
+# build script to always be either "i686" or "x86_64"
MRuby::CrossBuild.new('serenity') do |conf|
conf.toolchain :gcc

Specify potential values for SERENITY_ARCH