GNU awk is required for lib/memtype.h made by memtypes.awk. BSD awk complains: awk: gensub doesn't support backreferences (subst "\1")

This error is given when you try to compile quagga.

The easy solution is to

tested with Debian 8 and Quagga 1.2.1

apt-get install -y gawk

Compile quagga

If you need more help, here’s the list of the needed dependencies to compile correctly.

apt-get install -y build-essential gawk libreadline-dev pkg-config libc-ares-dev

After this, a simple

./configure [options]
make && make install

will do the rest. Check this link for the ./configure options.