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@@ -1,4 +1,11 @@
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 #!/usr/bin/env ruby
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+ESSENTIALS = [
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+	"boost/detail/{limits,endian}.hpp",
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+	"boost/config/*",
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+	"boost/detail/sp_counted_*",
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+	"boost/detail/atomic_count*",
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+	"libs/thread/src/*"
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+]
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 PROGRAM_SOURCE = %q{
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   #include <boost/shared_ptr.hpp>
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   #include <boost/thread.hpp>
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@@ -6,13 +13,10 @@ PROGRAM_SOURCE = %q{
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   #include <boost/bind.hpp>
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   #include <boost/date_time/posix_time/posix_time.hpp>
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 }
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-
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-boost_dir = ARGV[0]
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+BOOST_DIR = ARGV[0]
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 Dir.chdir(File.dirname(__FILE__) + "/../ext")
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-File.open("test.cpp", "w") do |f|
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-	f.write(PROGRAM_SOURCE)
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-end
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+# Run the given command, and abort on error.
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 def sh(*command)
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   puts command.join(" ")
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   if !system(*command)
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@@ -21,30 +25,78 @@ def sh(*command)
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   end
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 end
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-done = false
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-while !done
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-	missing_headers = `g++ test.cpp -c -I. 2>&1`.
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-	  split("\n").
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-	  grep(/error: .*: No such file/).
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-	  map do |line|
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-		file = line.sub(/.*error: (.*): .*/, '\1')
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-		if file =~ /^boost\//
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-			file
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-		else
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-			line =~ /(.*?):/
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-			source = $1
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-			File.dirname(source) + "/" + file
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+def install(source_filename, target_filename)
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+	command = ["install", "-D", "--mode=u+rw,g+r,o+r", source_filename, target_filename]
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+	sh(*command)
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+end
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+
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+def copy_boost_files(*patterns)
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+	patterns.each do |pattern|
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+		Dir["#{BOOST_DIR}/#{pattern}"].each do |source|
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+			if File.directory?(source)
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+				source.slice!(0 .. BOOST_DIR.size)
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+				copy_boost_files("#{source}/*")
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+			else
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+				target = source.slice(BOOST_DIR.size + 1 .. source.size - 1)
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+				target.sub!(%r{^libs/thread/}, 'boost/')
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+				if !File.exist?(target)
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+					install(source, target)
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+				end
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+			end
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+		end
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+	end
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+end
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+
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+def copy_essential_files
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+	copy_boost_files(*ESSENTIALS)
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+end
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+
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+def prepare
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+	File.open("test.cpp", "w") do |f|
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+		f.write(PROGRAM_SOURCE)
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+	end
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+end
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+
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+def cleanup
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+	File.unlink("test.cpp") rescue nil
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+end
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+
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+# Compile PROGRAM_SOURCE and copy whatever missing header files the compiler needs.
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+def copy_dependencies
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+	done = false
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+	while !done
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+		missing_headers = `g++ test.cpp -c -I. 2>&1`.
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+		  split("\n").
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+		  grep(/error: .*: No such file/).
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+		  map do |line|
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+			file = line.sub(/.*error: (.*): .*/, '\1')
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+			if file =~ /^boost\//
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+				file
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+			else
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+				line =~ /(.*?):/
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+				source = $1
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+				File.dirname(source) + "/" + file
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+			end
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     end
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+		missing_headers.each do |header|
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+			install("#{BOOST_DIR}/#{header}", header)
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+		end
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+		done = missing_headers.empty?
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+	end
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+end
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+
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+def start
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+	if BOOST_DIR.nil? || BOOST_DIR.empty?
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+		puts "Usage: copy_boost_headers.rb <boost source directory>"
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+		exit 1
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   end
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-	missing_headers.each do |header|
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-		command = ["install", "-D", "--mode=u+rw,g+r,o+r", "#{boost_dir}/#{header}", header]
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-		sh(*command)
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+	begin
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+		prepare
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+		copy_essential_files
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+		copy_dependencies
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+	ensure
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+		cleanup
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   end
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-	done = missing_headers.empty?
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 end
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-sh "cp    #{boost_dir}/boost/detail/{limits,endian}.hpp boost/detail/"
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-sh "cp -R #{boost_dir}/boost/config/* boost/config/"
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-sh "cp -R #{boost_dir}/boost/detail/sp_counted_* boost/detail/"
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-sh "cp -R #{boost_dir}/boost/detail/atomic_count* boost/detail/"
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-sh "mkdir -p boost/src && cp -R #{boost_dir}/libs/thread/src/* boost/src/"
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+start