pjsip is not building on ubuntu

[gourashish11]

hi,
i am trying to build pjsipdemo project according to this document
http://supportforums.blackberry.com/t5/Native-Development/Porting-PJSIP-PJMEDIA-and-PJLIB-to-BlackBerry-10/ta-p/2085751

when i am executing this command
./buildpjsip
i ma getting thsese errors..

Makefile:1: build.mak: No such file or directory
Makefile:2: build/host-.mak: No such file or directory
make: *** No rule to make target build/host-.mak'. Stop. checking build system type... i686-pc-linux-gnu checking host system type... i486-pc-nto-qnx8.0.0 checking target system type... i486-pc-nto-qnx8.0.0 checking for i486-pc-nto-qnx8.0.0-gcc... no checking for gcc... gcc checking whether the C compiler works... no aconfigure: error: in/home/ahsish/Downloads/bb10-pjsipdemo-master/bb10-pjsipdemo-master/pjbuildscripts/pjsip-build/trunk':
aconfigure: error: C compiler cannot create executables
See config.log' for more details Makefile:1: build.mak: No such file or directory Makefile:2: build/host-.mak: No such file or directory make: *** No rule to make targetbuild/host-.mak'. Stop.
Makefile:1: build.mak: No such file or directory
Makefile:2: build/host-.mak: No such file or directory
make: *** No rule to make target build/host-.mak'. Stop. cp: missing destination file operand after/x86/lib'
Try `cp --help' for more information.
/home/ahsish/Downloads/bb10-pjsipdemo-master/bb10-pjsipdemo-master/pjbuildscripts/pjsip-build /home/ahsish/Downloads/bb10-pjsipdemo-master/bb10-pjsipdemo-master/pjbuildscripts
adding: libopencore-amrwb.a (deflated 67%)
adding: libopencore-amrnb.a (deflated 70%)
plz help me...
i have been facing this issue for one months..