multiple linux-sources

root@bt:~# dpkg -l | grep linux-source-*
ii  linux-source                         1.1-bt3                                           BackTrack Linux Kernel Source Virtual Package
rc  linux-source-2.6.38                  2.6.38-10.00.Custom                               Linux kernel source for version 2.6.38
rc  linux-source-2.6.38-rc7              2.6.38-rc7-10.00.Custom                           Linux kernel source for version 2.6.38-rc7
rc  linux-source-2.6.38-rc8              2.6.38-rc8-10.00.Custom                           Linux kernel source for version 2.6.38-rc8
ii  linux-source-2.6.39.4                2.6.39.4-10.00.Custom                             Linux kernel source for version 2.6.39.4