I have followed the procedure present in "http://source.android.com/download" to build the android source. And tried running emulator from the shell prompt (as mentioned in the procedure).
But the emulator is getting terminated with a buffer overflow error.

Build machine:Ubuntu
Error:

shell:>emulator
emulator: warning: opening audio output failed

*** buffer overflow detected ***: emulator terminated
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(__fortify_fail+0x48)[0xb7d91558]
/lib/tls/i686/cmov/libc.so.6[0xb7d8f680]
/lib/tls/i686/cmov/libc.so.6[0xb7d8ed68]
/lib/tls/i686/cmov/libc.so.6(_IO_default_xsputn+0xc8)[0xb7d04a18]
/lib/tls/i686/cmov/libc.so.6(_IO_vfprintf+0xf4a)[0xb7cd78da]
/lib/tls/i686/cmov/libc.so.6(__vsprintf_chk+0xa7)[0xb7d8ee17]
/lib/tls/i686/cmov/libc.so.6(__sprintf_chk+0x2d)[0xb7d8ed5d]
emulator[0x8091f79]
======= Memory map: ========

Any suggestions will be appreciated.

I never compiled the sources, but why do you do that? Why not simply install the precompiled sdk?