diff -aur sqlite3-ruby-1.1.0.orig/setup.rb sqlite3-ruby-1.1.0/setup.rb
--- sqlite3-ruby-1.1.0.orig/setup.rb	2005-01-09 16:03:43.000000000 +0100
+++ sqlite3-ruby-1.1.0/setup.rb	2006-03-13 22:26:44.032249500 +0100
@@ -377,7 +377,7 @@
 module FileOperations
 
   def mkdir_p(dirname, prefix = nil)
-    dirname = prefix + dirname if prefix
+    dirname = ENV["DESTDIR"] + (prefix || "") + File.expand_path(dirname)
     $stderr.puts "mkdir -p #{dirname}" if verbose?
     return if no_harm?
 
@@ -440,7 +440,8 @@
     $stderr.puts "install #{from} #{dest}" if verbose?
     return if no_harm?
 
-    realdest = prefix ? prefix + dest : dest
+    realdest = ENV["DESTDIR"] || ""
+    realdest += prefix ? prefix + File.expand_path(dest) : dest
     realdest = File.join(realdest, File.basename(from)) if File.dir?(realdest)
     str = File.binread(from)
     if diff?(str, realdest)