diff --git a/devel/rubygem-zstd-ruby/files/patch-ext_zstdruby_extconf.rb b/devel/rubygem-zstd-ruby/files/patch-ext_zstdruby_extconf.rb
new file mode 100644
index 0000000000000..b939c97d24f86
--- /dev/null
+++ b/devel/rubygem-zstd-ruby/files/patch-ext_zstdruby_extconf.rb
@@ -0,0 +1,10 @@
+--- ext/zstdruby/extconf.rb.orig	2023-01-26 09:37:28 UTC
++++ ext/zstdruby/extconf.rb
+@@ -1,6 +1,6 @@
+ require "mkmf"
+ 
+-$CFLAGS = '-I. -O3 -std=c99'
++$CFLAGS = '-fdeclspec -I. -O3 -std=c99'
+ $CPPFLAGS += " -fdeclspec" if CONFIG['CXX'] =~ /clang/
+ 
+ Dir.chdir File.expand_path('..', __FILE__) do