linking with VS.NET: executor_globals_id is an unresolved external symbol

Using Visual Studio.NET, I can build PHP fine using the php5ts project/solution. I have a problem, however, with another project I've added to the solution which is a custom extension with no external (to PHP) library dependencies. It was working (compiling, linking, and then being loaded into PHP and run) just fine. However, when I added a call to call_user_function_ex() in the extension, it wouldn't link anymore. I get this error on linking: error LNK2001: unresolved external symbol _executor_globals_id I am calling call_user_function_ex() like this: res = call_user_function_ex(EG(function_table), NULL, callback_func, &callback_retval, 3, callback_params, 0, NULL TSRMLS_CC); so it seems that the executor_globals_id symbol comes from the use of EG(function_table). The file with the call_user_function_ex() call includes "zend_globals.h" which has the "extern int executor_globals_id" statement in the #ifdef ZTS clause. The extension compiles and links and runs just fine on Linux (presumably because ZTS isn't defined.) Is this something anyone else has run into? I can provide my .vcproj file if that's helpful. Thanks, David