diff --git devel/rubygem-rbtrace/files/patch-ext_extconf.rb devel/rubygem-rbtrace/files/patch-ext_extconf.rb
new file mode 100644
index 000000000000..aec92c92d9a5
--- /dev/null
+++ devel/rubygem-rbtrace/files/patch-ext_extconf.rb
@@ -0,0 +1,11 @@
+--- ext/extconf.rb.orig	2019-10-31 16:57:02 UTC
++++ ext/extconf.rb
+@@ -41,6 +41,8 @@ unless File.exists?("#{CWD}/dst/#{libdir}/libmsgpackc.
+       puts "  -- env CFLAGS=#{ENV['CFLAGS'].inspect} LDFLAGS=#{ENV['LDFLAGS'].inspect} CC=#{ENV['CC'].inspect}"
+       sys("./configure --disable-dependency-tracking --disable-shared --with-pic --prefix=#{CWD}/dst/ --libdir=#{CWD}/dst/#{libdir}")
+       sys("make install")
++      FileUtils.rm "#{CWD}/src/#{dir}/src/.libs/libmsgpackc.la"
++      FileUtils.rm "#{CWD}/src/#{dir}/src/.libs/libmsgpack.la"
+     end
+   end
+