Snippet from the Internet:

Common Symbols

If you get errors in linking complaining about common symbols
ld: common symbols not allowed with MH_DYLIB format

Then it means that you've got a global variable in the library which has
not been assigned a value.

Got this problem with three globals in NdbDaemon.c


BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

@@ -106,6 +106,7 @@ monty@tik.
 monty@tik.mysql.fi
 monty@tramp.mysql.fi
 monty@work.mysql.com
+mronstrom@mysql.com
 mwagner@cash.mwagner.org
 mwagner@evoq.mwagner.org
 mwagner@work.mysql.com

ndb/src/common/portlib/unix/NdbDaemon.c

@@ -18,9 +18,9 @@
 #include "NdbDaemon.h"
 
 #define NdbDaemon_ErrorSize 500
-long NdbDaemon_DaemonPid;
-int NdbDaemon_ErrorCode;
-char NdbDaemon_ErrorText[NdbDaemon_ErrorSize];
+long NdbDaemon_DaemonPid = 0;
+int NdbDaemon_ErrorCode = 0;
+char NdbDaemon_ErrorText[NdbDaemon_ErrorSize] = "";
 
 int
 NdbDaemon_Make(const char* lockfile, const char* logfile, unsigned flags)