All I can say is your OS appears to be broken.
He needs to set up the environment before trying to compile bfgminer.
configure: error: Could not find jansson library
root@sunwatch:~# sudo apt-get install libjansson-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libjansson-dev
regards
root@sunwatch:/usr/src# dpkg -i libjansson-dev_2.7-1_armel.deb
Selecting previously deselected package libjansson-dev.
(Reading database ... 30542 files and directories currently installed.)
Unpacking libjansson-dev (from libjansson-dev_2.7-1_armel.deb) ...
dpkg: dependency problems prevent configuration of libjansson-dev:
libjansson-dev depends on libjansson4 (= 2.7-1); however:
Package libjansson4 is not installed.
dpkg: error processing libjansson-dev (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
libjansson-dev
I'd suggest you read the README file and sequentially and carefully follow the instructions section of setting up the developement environment before you try to compile.
I have not done it on rPi, but used BFGMiner instructions for setting up MinGW on windows and it works a treat. All the errors that you are encountering indicate that your environment is not set up correctly, and posting each error as you encounter it may simply bamboozle whoever is trying to help.
I know for sure you'll encounter compilation errors that need Luke-Jr to address, but if you keep crying wolf when there is none, then when that wolf does turn up you may not get the help you require!