How to run gdb inside emacs

[Jerry Wang]

When I invoke gdb inside emacs, I got the following message:

  Symbol's function definition is void: keymap-name

The gdb seems working fine, except no source displayed in separate buffer.

I tried to load gud.el explicitiy in my .emacs file and it didn't solve the 
problem.

I'm use emacs 21.3.1 and gdb 5.2 running on Linux 2.4.7.

Can any one help me?

Thanks.

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