5262 libm needs to be carefully unifdef'd
5268 libm doesn't need to hide symbols which are already local

*** 55,68 ****
  
  /* external globals */
  void (*__mt_fex_sync)() = NULL; /* for synchronization with libmtsk */
  #pragma weak __mt_fex_sync
  
- #ifdef LIBM_MT_FEX_SYNC
  void (*__libm_mt_fex_sync)() = NULL; /* new, improved version of above */
  #pragma weak __libm_mt_fex_sync
- #endif
  
  /* private variables */
  static fex_handler_t main_handlers;
  static int handlers_initialized = 0;
  static thread_key_t handlers_key;
--- 55,66 ----
*** 143,153 ****
          }
          else if (master && fex_get_log())
                  __fex_update_te();
  }
  
- #ifdef LIBM_MT_FEX_SYNC
  /*
  *  The following function may be used for synchronization with any
  *  internal project that manages multiple threads
  */
  enum __libm_mt_fex_sync_actions {
--- 141,150 ----
*** 202,212 ****
                  }
  #endif
                  break;
          }
  }
- #endif
  
  #if defined(__sparc)
  
  /*
  *  Code for setting or clearing interval mode on US-III and above.
--- 199,208 ----
*** 840,849 ****
          }
  
          /* synchronize with libmtsk */
          __mt_fex_sync = __fex_sync_with_libmtsk;
  
- #ifdef LIBM_MT_FEX_SYNC
          /* synchronize with other projects */
          __libm_mt_fex_sync = __fex_sync_with_threads;
- #endif
  }
--- 836,843 ----