--- a/sassc.gemspec	2020-06-02 13:09:54.000000000 +0000

+++ b/sassc.gemspec	2020-12-09 15:03:44.820000000 +0000

@@ -40,12 +40,6 @@ Gem::Specification.new do |spec|

   gem_dir = File.expand_path(File.dirname(__FILE__)) + "/"

   libsass_dir = File.join(gem_dir, 'ext', 'libsass')

-  if !File.directory?(libsass_dir) ||

-      # '.', '..', and possibly '.git' from a failed checkout:

-      Dir.entries(libsass_dir).size <= 3

-    Dir.chdir(__dir__) { system('git submodule update --init') } or

-        fail 'Could not fetch libsass'

-  end

   # Write a VERSION file for non-binary gems (for `SassC::Native.version`).

   if File.exist?(File.join(libsass_dir, '.git'))

--- a/ext/extconf.rb	2020-12-09 14:56:14.362000000 +0000

+++ b/ext/extconf.rb	2020-12-09 14:59:16.634000000 +0000

@@ -3,9 +3,10 @@

 gem_root = File.expand_path('..', __dir__)

 libsass_dir = File.join(gem_root, 'ext', 'libsass')

-if !File.directory?(libsass_dir) ||

+if !ARGV.include?('--use-system-libraries') &&

+  (!File.directory?(libsass_dir) ||

    # '.', '..', and possibly '.git' from a failed checkout:

-   Dir.entries(libsass_dir).size <= 3

+   Dir.entries(libsass_dir).size <= 3)

   Dir.chdir(gem_root) { system('git submodule update --init') } or

     fail 'Could not fetch libsass'

 end