# Note: depends on m4
# Note: depends on bison
wget -c http://downloads.sourceforge.net/project/flex/flex-2.6.0.tar.xz
tar -xJf flex-2.6.0.tar.xz
cd flex-2.6.0
mkdir -p build
cd build
../configure --prefix="/usr"
make # Doesn't mind -j#
make install