HomebrewでOSX Lionにrmtrashをインストールしようとしたらビルドに失敗した

$ brew install rmtrash
==> Downloading http://www.nightproductions.net/downloads/rmtrash_source.tar.gz
######################################################################## 100.0%
==> make LDFLAGS='-framework Foundation -prebind' all
In file included from /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:120:0,
                 from rmtrash.m:1:
/System/Library/Frameworks/Foundation.framework/Headers/NSTask.h:75:24: error: expected identifier or '(' before '^' token
/System/Library/Frameworks/Foundation.framework/Headers/NSTask.h:78:1: error: expected identifier before 'end'
make: *** [rmtrash] Error 1

Error: rmtrash did not build
Logs: /Users/User/Library/Logs/Homebrew/rmtrash/
Help: https://github.com/mxcl/homebrew/wiki/troubleshooting

とりあえずメモ．原因は調べてません．