Rakefile in psd_native-0.3.1 vs Rakefile in psd_native-0.4.0

@@ -2,10 +2,10 @@
 require "rake/extensiontask"
 require 'rspec/core/rake_task'
 
 Rake::ExtensionTask.new('psd_native') do |ext|
   ext.lib_dir = File.join('lib', 'psd_native')
-  ext.config_options = '--with-cflags="-std=c99 -openmp"'
+  ext.config_options = '--with-cflags="-std=c99"'
 end
 
 Rake::Task['spec'].prerequisites << :compile
 
 RSpec::Core::RakeTask.new(:spec)
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