--- ./ext/ruby_http_parser/extconf.rb	2022-04-18 19:41:59.313000000 +0000

+++ ./ext/ruby_http_parser/extconf.rb	2022-04-18 20:21:08.161000000 +0000

@@ -1,3 +1,5 @@

+#!/usr/bin/ruby

+

 require 'mkmf'

 # check out code if it hasn't been already

@@ -10,12 +12,21 @@ end

 # mongrel and http-parser both define http_parser_(init|execute), so we

 # rename functions in http-parser before using them.

-vendor_dir = File.expand_path('../vendor/http-parser/', __FILE__)

 src_dir = File.expand_path('../', __FILE__)

-%w[ http_parser.c http_parser.h ].each do |file|

-  File.open(File.join(src_dir, "ryah_#{file}"), 'w'){ |f|

-    f.write File.read(File.join(vendor_dir, file)).gsub('http_parser', 'ryah_http_parser')

-  }

+if find_library("http_parser", "http_parser_init") && find_header("http_parser.h")

+  File.open("ryah_http_parser.h", "w+") do |f|

+    f.puts('#include "http_parser.h"')

+    [nil, :settings, :type, :execute, :init].each do |name|

+      f.puts("#define #{["ryah_http_parser", name].compact.join("_")} #{["http_parser", name].compact.join("_")}")

+    end

+  end

+else

+  vendor_dir = File.expand_path('../vendor/http-parser/', __FILE__)

+  %w[ http_parser.c http_parser.h ].each do |file|

+    File.open(File.join(src_dir, "ryah_#{file}"), 'w'){ |f|

+      f.write File.read(File.join(vendor_dir, file)).gsub('http_parser', 'ryah_http_parser')

+    }

+  end

 end

 $CFLAGS << " -I\"#{src_dir}\""