Don't use pipefail on Tiger

See #99.

install

@@ -158,11 +158,10 @@ Dir.chdir HOMEBREW_PREFIX do
     system git, "reset", "--hard", "origin/master"
   else
     # -m to stop tar erroring out if it can't modify the mtime for root owned directories
-    # pipefail to cause the exit status from curl to propogate if it fails
     # we use -k for curl because Leopard has a bunch of bad SSL certificates
     curl_flags = "fsSL"
     curl_flags << "k" if macos_version <= 10.5
-    system "/bin/bash -o pipefail -c '/usr/bin/curl -#{curl_flags} https://github.com/mxcl/homebrew/tarball/master | /usr/bin/tar xz -m --strip 1'"
+    system "/bin/bash -c '/usr/bin/curl -#{curl_flags} https://github.com/mistydemeo/tigerbrew/tarball/master | /usr/bin/tar xz -m --strip 1'"
   end
 end