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diff --git a/lib/bundler/templates/newgem/ext/newgem/extconf-c.rb.tt b/lib/bundler/templates/newgem/ext/newgem/extconf-c.rb.tt
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+++ b/lib/bundler/templates/newgem/ext/newgem/extconf-c.rb.tt
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+# frozen_string_literal: true
+
+require "mkmf"
+
+# Makes all symbols private by default to avoid unintended conflict
+# with other gems. To explicitly export symbols you can use RUBY_FUNC_EXPORTED
+# selectively, or entirely remove this flag.
+append_cflags("-fvisibility=hidden")
+
+create_makefile(<%= config[:makefile_path].inspect %>)