$ tar xzf perl-5.6.1
$ cd perl-5.6.1
$ ./Configure 
...
What optimizer/debugger flag should be used? [-O2] -g -O0
...
Installation prefix to use? (~name ok) [/usr/local] /usr/local/perl/debug/
Directory /usr/local/perl/debug/ doesn't exist.  Use that name anyway? [n] y
...
$ make && make test
$ su -c "make install"
...

##</code><code>##

$ /usr/local/perl/debug/bin/perl Makefile.PL
$ make

##</code><code>##

$ gdb /usr/local/perl/debug/bin/perl
...
(gdb) r -Mblib t/test.pl
...
# the segmentation fault signal will be cought
# by the debugger. To see where it happened
# run the backtrace command:
(gdb) bt
...