OK ... I have compiled it once again - really don't know why this time
libperl is visible?:
pgsql2-test:/usr/src/postgresql-8.0.3/src/pl/plperl#
pgsql2-test:/usr/src/postgresql-8.0.3/src/pl/plperl# ldd libplperl.so
libperl.so => /usr/lib/libperl.so (0xb7ed1000)
libdl.so.2 => /lib/tls/libdl.so.2 (0xb7ecd000)
libm.so.6 => /lib/tls/libm.so.6 (0xb7eab000)
libpthread.so.0 => /lib/tls/libpthread.so.0 (0xb7e9c000)
libc.so.6 => /lib/tls/libc.so.6 (0xb7d67000)
libcrypt.so.1 => /lib/tls/libcrypt.so.1 (0xb7d3a000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
pgsql2-test:/usr/src/postgresql-8.0.3/src/pl/plperl#
But still problem with Perl_craok exists during creating lang plperl ;(
Marcin