diff --git a/ext/nokogiri/extconf.rb b/ext/nokogiri/extconf.rb
index 2cce4d9dcbd..7af21c3a717 100644
--- a/ext/nokogiri/extconf.rb
+++ b/ext/nokogiri/extconf.rb
@@ -391,7 +391,7 @@ def using_system_libraries?
   do_clean
 end
 
-if openbsd?
+if openbsd? && !ENV['CC']
   unless find_executable 'egcc'
     message "please install gcc 4.9+ from ports using `pkg_add -v gcc`\n"
     exit! 1