An alternate workaround that I found (I had the same issue) is to run partprobe. It'll find them and add them to /dec whether you have kernel support for GPT or not.
- [gentoo-user] Re: GPT newbee needs some help James
- Re: [gentoo-user] Re: GPT newbee needs some help Neil Bothwick
- Re: [gentoo-user] Re: GPT newbee needs some help covici
- [gentoo-user] Re: GPT newbee needs some help James
- Re: [gentoo-user] Re: GPT newbee needs some h... Neil Bothwick
- Re: [gentoo-user] Re: GPT newbee needs so... Helmut Jarausch
- Re: [gentoo-user] Re: GPT newbee nee... Neil Bothwick
- Re: [gentoo-user] Re: GPT newbee... Helmut Jarausch
- Re: [gentoo-user] Re: GPT newbee... Dmitry Bogun
- Re: [gentoo-user] Re: GPT newbee... Helmut Jarausch
- Re: [gentoo-user] Re: GPT newbee... John Runyon