Description:
------------
pecl-runkit compile fine, but Sandbox Support is always 
disabled:

phpinfo() report:

runkit support - enabled
version - 0.9
Custom Superglobal support - enabled
Sandbox Support - disable or unavailable
Runtime Manipulation - enabled

configure process report:

checking whether to enable runkit support... yes, shared
checking wheter to enable runtime manipulation of 
functions/classes/constants... yes, shared
checking whether to enable registration of user-defined 
autoglobals... yes, shared
checking whether to enable Sandbox support... yes, shared


what is the reasone that make Sandbox Support disabled?

here below there are some extra infos about my enviroment:

System uname: 2.6.18-gentoo i686 VIA Samuel 2
Gentoo Base System version 1.12.5
Last Sync: Sun, 01 Oct 2006 14:30:08 +0000
app-admin/eselect-compiler: [Not Present]
dev-java/java-config: 1.3.7, 2.0.30
dev-lang/python:     2.4.3-r4
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     [Not Present]
dev-util/confcache:  0.4.2-r1
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.59-r7
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 
1.8.5-r3, 1.9.6-r2
sys-devel/binutils:  2.16.1-r3
sys-devel/gcc-config: 1.3.13-r3
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.17-r1
CBUILD="i686-pc-linux-gnu"
CFLAGS="-march=c3 -O2 -pipe -fno-ident -fomit-frame-pointer -momit-leaf-frame-pointer -fforce-addr -fweb -ftracer"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="-march=c3 -O2 -pipe -fno-ident -fomit-frame-pointer -momit-leaf-frame-pointer -fforce-addr -fweb -ftracer"
MAKEOPTS="-j1 -s"


Reproduce code:
---------------
$sanbox_options = array(
   'safe_mode'=>true,
   'allow_url_fopen'=>'false',
   'disable_functions'=>'exec,shell_exec,passthru,system',
   'runkit.superglobal' => '_CORE',
   'disable_classes'=>'myAppClass');
$sandbox = new Runkit_Sandbox($sanbox_options);

Expected result:
----------------
$sandbox must be a Runkit_Sandbox object

Actual result:
--------------
Fatal error: Class 'Runkit_Sandbox' not found

but pecl is correctly loaded:
- "php -m" report it.
- phpinfo() report the runkit section (see before).
- extension_loaded('runkit') return always TRUE.