Can't install bbb-record-core

gistfile1.txt

root@26797-2-1051166:/etc# apt-get -f install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  linux-headers-2.6.32-39-generic linux-headers-2.6.32-28 linux-headers-2.6.32-39
  linux-headers-2.6.32-28-generic
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  bbb-record-core
The following NEW packages will be installed:
  bbb-record-core
0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded.
178 not fully installed or removed.
Need to get 0B/22.6kB of archives.
After this operation, 258kB of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 108678 files and directories currently installed.)
Unpacking bbb-record-core (from .../bbb-record-core_0.80ubuntu104_amd64.deb) ...
Building native extensions.  This could take a while...
ERROR:  Error installing god:
	ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
extconf.rb:1:in `require': no such file to load -- mkmf (LoadError)
	from extconf.rb:1


Gem files will remain installed in /var/lib/gems/1.8/gems/god-0.12.1 for inspection.
Results logged to /var/lib/gems/1.8/gems/god-0.12.1/ext/god/gem_make.out
dpkg: error processing /var/cache/apt/archives/bbb-record-core_0.80ubuntu104_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/bbb-record-core_0.80ubuntu104_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)