narwhal-jsc failed build

Would you like to install the JavaScriptCore engine for Narwhal?
This is optional but will make building and running Objective-J much faster.
Enter "yes" or "no": 
yes
The following packages will be downloaded and installed:
 * narwhal-jsc
Downloading: http://github.com/tlrobinson/narwhal-jsc/zipball/master
Unzipping: /usr/local/narwhal/zips/narwhal-jsc.zip
 + /usr/local/narwhal/packages/narwhal-jsc/.gitignore
 + /usr/local/narwhal/packages/narwhal-jsc/Info.plist
 + /usr/local/narwhal/packages/narwhal-jsc/Makefile
 + /usr/local/narwhal/packages/narwhal-jsc/NWDebug.h
 + /usr/local/narwhal/packages/narwhal-jsc/NWDebug.m
 + /usr/local/narwhal/packages/narwhal-jsc/README.md
 + /usr/local/narwhal/packages/narwhal-jsc/bin/narwhal-jsc
 + /usr/local/narwhal/packages/narwhal-jsc/bin/source-test.sh
 + /usr/local/narwhal/packages/narwhal-jsc/bootstrap.js
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/.gitignore
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/LICENSE
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/Makefile
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/README.md
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/http_parser.c
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/http_parser.h
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/http_parser.rl
 + /usr/local/narwhal/packages/narwhal-jsc/deps/http-parser/test.c
 + /usr/local/narwhal/packages/narwhal-jsc/include/binary-engine.h
 + /usr/local/narwhal/packages/narwhal-jsc/include/io-engine.h
 + /usr/local/narwhal/packages/narwhal-jsc/include/narwhal.h
 + /usr/local/narwhal/packages/narwhal-jsc/lib/file-engine.js
 + /usr/local/narwhal/packages/narwhal-jsc/lib/http.js
 + /usr/local/narwhal/packages/narwhal-jsc/lib/io-engine.js
 + /usr/local/narwhal/packages/narwhal-jsc/lib/os-engine.js
 + /usr/local/narwhal/packages/narwhal-jsc/lib/system.js
 + /usr/local/narwhal/packages/narwhal-jsc/lib/zip.js
 + /usr/local/narwhal/packages/narwhal-jsc/narwhal-jsc.c
 + /usr/local/narwhal/packages/narwhal-jsc/narwhal.c
 + /usr/local/narwhal/packages/narwhal-jsc/package.json
 + /usr/local/narwhal/packages/narwhal-jsc/src/binary-engine.cc
 + /usr/local/narwhal/packages/narwhal-jsc/src/file-engine.cc
 + /usr/local/narwhal/packages/narwhal-jsc/src/io-engine.cc
 + /usr/local/narwhal/packages/narwhal-jsc/src/jack/handler/jill.cc
 + /usr/local/narwhal/packages/narwhal-jsc/src/os-engine.cc
Done.
gcc -o lib/libnarwhal.dylib narwhal.c -dynamiclib -0s -force_cpusubtype_ALL -mmacosx-version-min=10.4 -arch i386 -arch ppc -Iinclude  -framework JavaScriptCore -lreadline 
mkdir -p `dirname bin/narwhal-webkit`
gcc -o bin/narwhal-webkit -DWEBKIT -x objective-c narwhal-jsc.c -0s -force_cpusubtype_ALL -mmacosx-version-min=10.4 -arch i386 -arch ppc -Iinclude -framework JavaScriptCore -L/usr/lib -lreadline -liconv -Llib -lnarwhal  \
		-framework Foundation -framework WebKit
install_name_tool -change "lib/libnarwhal.dylib" "@executable_path/../lib/libnarwhal.dylib" "bin/narwhal-webkit"
mkdir -p `dirname lib/binary-engine.dylib`
g++ -o lib/binary-engine.dylib src/binary-engine.cc -0s -force_cpusubtype_ALL -mmacosx-version-min=10.4 -arch i386 -arch ppc -Iinclude -dynamiclib -framework JavaScriptCore -L/usr/lib -lreadline -liconv -Llib -lnarwhal 
Undefined symbols:
  "JSObjectMakeDate(OpaqueJSContext const*, unsigned long, OpaqueJSValue const* const*, OpaqueJSValue const**)", referenced from:
      _JS_date(OpaqueJSContext const*, OpaqueJSValue const**, long long)in cc8nk6nb.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
Undefined symbols:
  "JSObjectMakeDate(OpaqueJSContext const*, unsigned long, OpaqueJSValue const* const*, OpaqueJSValue const**)", referenced from:
      _JS_date(OpaqueJSContext const*, OpaqueJSValue const**, long long)in ccB7UlWl.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
lipo: can't open input file: /var/tmp//ccEIWV7G.out (No such file or directory)
make: *** [lib/binary-engine.dylib] Error 1