Getting an error when trying to build Dart on Mac OS 10.8.2 with XCode 4.6

Command run to build dart

./tools/build.py --arch=ia32 &> dart_build_output

dart_build_output

Build settings from command line:
    SYMROOT = /Users/mark/code/dart/dart/xcodebuild

=== BUILD AGGREGATE TARGET dart_analyzer OF PROJECT dart-compiler WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET compiler OF PROJECT dart WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_async_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_async_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_corelib_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_corelib_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_collection_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_collection_dev_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_crypto_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_math_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_math_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_isolate_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_isolate_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_json_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_json_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_mirrors_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_mirrors_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_scalarlist_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_scalarlist_patch_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_uri_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD AGGREGATE TARGET generate_utf_cc_file OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies


=== BUILD NATIVE TARGET libdart_lib_withcore OF PROJECT dart-runtime WITH CONFIGURATION DebugIA32 ===
Check dependencies
error: There is no SDK with the name or path '/Users/mark/code/dart/dart/runtime/macosx10.5'


** BUILD FAILED **


The following build commands failed:
  Check dependencies
(1 failure)
xcodebuild -project dart.xcodeproj -target All -configuration DebugIA32 SYMROOT=/Users/mark/code/dart/dart/xcodebuild
BUILD FAILED

my_env

rvm_bin_path=/Users/mark/.rvm/bin
TERM_PROGRAM=iTerm.app
GEM_HOME=/Users/mark/.rvm/gems/ruby-1.9.2-p290
TERM=xterm
SHELL=/bin/bash
IRBRC=/Users/mark/.rvm/rubies/ruby-1.9.2-p290/.irbrc
TMPDIR=/var/folders/qy/6f9mqpvn7xvbjzsdbxhtz1wc0000gn/T/
GOBIN=/usr/local/go/bin
Apple_PubSub_Socket_Render=/tmp/launch-FbN3XU/Render
OLDPWD=/Users/mark/code/dart
MY_RUBY_HOME=/Users/mark/.rvm/rubies/ruby-1.9.2-p290
USER=mark
COMMAND_MODE=unix2003
__array_start=0
rvm_path=/Users/mark/.rvm
SSH_AUTH_SOCK=/tmp/launch-BG1yia/Listeners
__CF_USER_TEXT_ENCODING=0x1F5:0:0
Apple_Ubiquity_Message=/tmp/launch-RArwG5/Apple_Ubiquity_Message
escape_flag=1
rvm_prefix=/Users/mark
PATH=/Users/mark/.rvm/gems/ruby-1.9.2-p290/bin:/Users/mark/.rvm/gems/ruby-1.9.2-p290@global/bin:/Users/mark/.rvm/rubies/ruby-1.9.2-p290/bin:/Users/mark/.rvm/bin:/Applications/Postgres.app/Contents/MacOS/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/usr/local/go/bin:./node_modules/.bin:/Users/mark/versioned/go/bin:/Users/mark/dart/dart-sdk/bin:/Users/mark/code/depot_tools:/Users/mark/bin:/Users/mark/dart/dart-sdk/bin:/usr/local/share/npm/bin
PWD=/Users/mark/code/dart/dart
GOARCH=amd64
LANG=en_CA.UTF-8
ITERM_PROFILE=Linux Terminal
NODE_PATH=#{HOMEBREW_PREFIX}/lib/node_modules
DART_SDK=/Users/mark/dart/dart-sdk
_second=1
PS1=\n\[\033[01;34m\]$(~/.rvm/bin/rvm-prompt) \[\033[01;32m\]\w\[\033[00;33m\]$(__git_ps1 " (%s)")\n\n  \[\033[01;36m\]$\[\033[00m\] 
rvm_version=1.16.17 ()
SHLVL=1
COLORFGBG=12;8
HOME=/Users/mark
GOROOT=/usr/local/go
GOOS=darwin
ITERM_SESSION_ID=w0t0p0
_first=0
LOGNAME=mark
GEM_PATH=/Users/mark/.rvm/gems/ruby-1.9.2-p290:/Users/mark/.rvm/gems/ruby-1.9.2-p290@global
GOPATH=/Users/mark/.gopath
DISPLAY=/tmp/launch-TdMHgC/org.macosforge.xquartz:0
RUBY_VERSION=ruby-1.9.2-p290
SECURITYSESSIONID=186a4
_=/usr/bin/env

Whats your gyp include settings?

$ cat ~/.gyp/include.gypi 
{
  'variables': {
    'xcode_gcc_version': 'com.apple.compilers.llvmgcc42',
    'mac_sdk': '10.7',
    'mac_deployment_target': '10.7',
  }
}

I also typically call the build with ./tools/build.py -m all -v -a ia32 --os=host -j 4

Btw, make sure to run gclient runhooks, that should regenerate the project files.