def detect_mingw
 compilers = ["i486-mingw32", "i586-mingw32","amd64-mingw32","i486-mingw32msvc","i586-mingw32msvc","amd64-mingw32msvc"]
 compilers.each do |compiler|
  sh "#{compiler}-gcc --version >/dev/null" do |ok, res|
   if (ok) then return compiler end
  end
 end
 puts "Cannot detect mingw. Please install mingw C compiler."
 exit
end
def copy_files_local
 mkdir_p "#{$prefix}/lang"
 mkdir_p "#{$prefix}/stead"
 mkdir_p "#{$prefix}/tests"
 mkdir_p "#{$prefix}/doc/modules"
 FileList["lang/*.ini"].each do |file|
  cp file,"#{$prefix}/lang"
 end
 FileList["stead/*.lua"].each do |file|
  cp file,"#{$prefix}/stead"
 end
 FileList["doc/modules/*.txt"].each do |file|
  cp file, "#{$prefix}/doc/modules"
 end
 FileList["tests/*.c"].each do |file|
  cp file, "#{$prefix}/tests"
 end
 FileList["doc/*.txt","doc/*.html","doc/*.pdf"].each do |file|
  cp file, "#{$prefix}/doc"
 end
 mkdir_p "#{$prefix}/src"
 Dir.glob("src/*/*.{c,h}").each do |file|
  mkdir_p $prefix + "/src/" + file.split("/").at(-2)
  cp file, $prefix + "/src/" + file.split("/").at(-2)
 end
 Dir.glob("games/*/*.{ini,lua,s3m,xm,it,jpg,png,ogg,wav,bin,ttf}").each do |file|
  mkdir_p $prefix + "/games/" + file.split("/").at(-2)
  cp file, $prefix + "/games/" + file.split("/").at(-2)
 end
 Dir.glob("games/*/*/*.{ini,lua,s3m,xm,it,jpg,png,ogg,wav,bin,ttf}").each do |file|
  mkdir_p $prefix + "/games/" + file.split("/").at(-3) + file.split("/").at(-2)
  cp file, $prefix + "/games/" + file.split("/").at(-3) + file.split("/").at(-2)
 end
 Dir.glob("themes/*/*.{ini,jpg,png,ogg,wav,ttf}").each do |file|
  mkdir_p $prefix + "/themes/" + file.split("/").at(-2)
  cp file, $prefix + "/themes/" + file.split("/").at(-2)
 end
 cp "Rakefile", $prefix
 cp "functions.rb", $prefix
 File.open("#{$prefix}/Rakefile", 'r+') do |f|
  newstr = f.read.gsub("VERSION = \"#{VERSION}\"", "VERSION = \"#{version}\"")
  f.rewind
  f.puts(newstr)
 end
 cp "README", "#{$prefix}/doc"
 sh "ln -fs #{$prefix}/doc/README #{$prefix}/README"
end

def configure #detects $cflags and $libs for every build
 print "C compiler.."
 sh "#{$cc} --version >/dev/null" do |ok,res|
  if !ok then
   sh "cc --version >/dev/null" do |ok, res|
    if !ok then
     sh "gcc --version >/dev/null" do |ok, res|
      if !ok then
       puts "Error: can't find C compiler. Please export CC variable for a valid one."
       exit
      else
       $cc = "gcc"
       print "gcc"
      end
     end
    else
     $cc = "cc"
     print "cc"
    end
   end
   else puts "cc"
  end
 end
  
 sh "pkg-config --version >/dev/null" do |ok, res|
  if !ok then
   puts "Error: there is no pkg-config in $PATH."
   exit
  end
 end
  
 print "zlib.. "
  sh "pkg-config --cflags zlib >/dev/null" do |ok,res|
   if (ok) then
    puts "system"
    $cflags.push(`pkg-config --cflags zlib`.chomp())
    $cflags.push("-D USE_UNPACK")
    $libs.push(`pkg-config --libs zlib`.chomp())
  else
   if File.exist? '/usr/include/zlib.h' then
    puts "own"
    Rake::Task["rake:build:zlib"].invoke
    $cflags.push("-D USE_UNPACK")
    $cflags.push("-I../zlib")
    $libs.push("-lz ../zlib/libz.a")
   else
    puts "not found"
   end
  end
 end
  
 print "gtk+-2.0.. "
 sh "pkg-config --cflags gtk+-2.0 >/dev/null" do |ok,res|
  if (ok) then
   puts "found"
   $cflags.push(`pkg-config --cflags gtk+-2.0`.chomp())
   $cflags.push "-D_USE_GTK -D_USE_BROWSE"
   $libs.push(`pkg-config --libs gtk+-2.0`.chomp())
  else
   puts "not found"
  end
 end
  
 print "libsoup-2.4.. "
 sh "pkg-config --cflags libsoup-2.4 >/dev/null" do |ok,res|
  if (ok) then
   puts "found"
   $cflags.push "-D_USE_HTTP"
   $cflags.push(`pkg-config --cflags libsoup-2.4`.chomp())
   $libs.push(`pkg-config --libs libsoup-2.4`.chomp())
  else
   puts "not found"
  end
 end
 
 print "lua.. "
 sh "pkg-config --cflags lua >/dev/null" do |ok,res|
  if (ok) then
   puts "found"
   $cflags.push(`pkg-config --cflags lua`.chomp())
   $libs.push(`pkg-config --libs lua`.chomp())
  else
   sh "pkg-config --cflags lua5.1 >/dev/null" do |ok,res|
    if (ok) then
     puts "found"
     $cflags.push(`pkg-config --cflags lua5.1`.chomp())
     $libs.push(`pkg-config --libs lua5.1`.chomp())
    else
     puts "not found"
     puts "Error: lua not found. Please install lua 5.1."
     exit
    end
   end
  end
 end
 
 $libs.push("-lSDL_mixer -lSDL_image -lSDL_ttf")
 
 Rake::Task["rake:test:sdl"].invoke #if we are still alive everything is perfect
 $cflags.unshift(`sdl-config --cflags`.chomp())
 $libs.unshift(`sdl-config --libs`.chomp())
 Rake::Task["rake:test:iconv"].invoke
 if $has_iconv>0 then
  $cflags.push("-D_HAVE_ICONV")
  if $has_iconv == 2 then $libs.push("-liconv") end
 end
end