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MySQL NDB Cluster API Developer Guide
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NDB API applications must be linked against both the MySQL and NDB client libraries. The NDB client library also requires some functions from the mystrings library, so this must be linked in as well.

The necessary linker flags for the MySQL client library are returned by mysql_config --libs. For multithreaded applications you should use the --libs_r instead:

$> mysql_config --libs_r
-L/usr/local/mysql/lib/mysql -lmysqlclient_r -lz -lpthread -lcrypt
-lnsl -lm -lpthread -L/usr/lib -lssl -lcrypto

It is now necessary only to add -lndbclient to LD_FLAGS, as shown here:

LDFLAGS="$LDFLAGS "`mysql_config --libs_r`
LDFLAGS="$LDFLAGS -lndbclient"