Configuring the emulated OS

What we just saw about schroot is nothing if we do not configure our new system to do native compilation, and to do so, we can use every Debian tool we use on our host PC:

1. To install a complete compiling environment, we can issue the following command once inside the schroot environment:

$ sudo apt install gcc make \
           bison flex ncurses-dev libssl-dev

If everything works well, we should now be able to execute every compiling command we used before. For instance, we can try to recompile the helloworld program again but natively (we should remove the current executable in order; make will try to recompile it again):

$ rm helloworld
$ make CFLAGS="-Wall -O2" helloworld
cc -Wall -O2 helloworld.c -o helloworld
$ file helloworld
helloworld: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0, BuildID[sha1]=1393450a08fb9eea22babfb9296ce848bb806c21, not stripped
$ ./helloworld
Hello World!