it is saying the bison package is missing.. i also tried to download it over terminal but it is saying the package is obsolete...what to do please help
maq86@ubuntu:~$ cd Downloads
maq86@ubuntu:~/Downloads$ cd /home/maq86/Downloads/omnetpp-4.0p1
maq86@ubuntu:~/Downloads/omnetpp-4.0p1$ ./configure
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
configure: -----------------------------------------------
configure: reading configure.user for your custom settings
configure: -----------------------------------------------
checking for icc... no
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for icpc... no
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking for ranlib... ranlib
checking whether g++ supports -fno-stack-protector... yes
checking whether g++ supports -fno-stack-protector... yes
checking if shared libs need -fPIC... yes
checking for dlopen with CFLAGS="" LIBS=""... no
checking if --export-dynamic linker option is supported/needed... test failed
checking for flags needed to link with static libs containing simple modules... --whole-archive
configure: NOTE: Use the following syntax when linking with static libraries
configure: containing simple modules and other dynamically registered components:
configure: g++ ... -Wl,--whole-archive <libs> -Wl,--no-whole-archive ...
checking whether linker supports -rpath... yes
checking for bison... no
checking for byacc... no
configure: error: Bison not found, needed to build OMNeT++/OMNEST -- please install it!
maq86@ubuntu:~/Downloads/omnetpp-4.0p1$