The Innodb plugin 1.0.4 can be installed dynamically using the 'INSTALL PLUGIN' syntax

If mysqld is already statically linked with the inbuilt innodb, it is not possible to 
install the innodb plugin 1.0.4 dynamically. Doing so would throw this error - Function
'innodb' already exists.

storage/innodb_plugin/Makefile.am:
  Remove references of 'storage/innobase' and use $(srcdir) instead. 
  Renamed the dynamic plugin library name to 'ha_innodb_plugin' so 
  that it can be installed along with inbuilt plugin.
storage/innodb_plugin/Makefile.in:
  Remove this file as it can be generated automatically by automake
  using the Makefile.am
storage/innodb_plugin/handler/ha_innodb.cc:
  Remove refernces to "storage/innobase" and the headers can be included directly.
  Declare the plugin with the new name innodb_plugin
storage/innodb_plugin/plug.in:
  Rename the plugin innobase as innodb_plugin