setup_dependencies: Add libpcap as dependency

The tracing04 lesson needs libpcap, so add that to setup_dependencies.org.
Also add the build-essential package on Ubuntu.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

Author: tohojo

setup_dependencies.org

@@ -18,7 +18,8 @@ this document and install the needed software packages.
   - [[#packages-on-opensuse-1][Packages on openSUSE]]
 - [[#recommended-tools][Recommended tools]]
   - [[#packages-on-fedora-2][Packages on Fedora]]
-  - [[#packages-on-debianubuntu-2][Packages on Debian/Ubuntu]]
+  - [[#packages-on-ubuntu][Packages on Ubuntu]]
+  - [[#packages-on-debian][Packages on Debian]]
   - [[#packages-on-opensuse-2][Packages on openSUSE]]
 
 * Based on libbpf
@@ -65,7 +66,7 @@ On a machine running the Fedora Linux distribution, install the packages:
 
 #+begin_example
  $ sudo dnf install clang llvm
- $ sudo dnf install elfutils-libelf-devel perf
+ $ sudo dnf install elfutils-libelf-devel libpcap-devel perf
 #+end_example
 
 Note also that Fedora by default sets a limit on the amount of locked memory
@@ -85,7 +86,7 @@ Note that you need to do this in the shell you are using to load programs
 On Debian and Ubuntu installations, install the dependencies like this:
 
 #+begin_example
- $ sudo apt install clang llvm libelf-dev gcc-multilib
+ $ sudo apt install clang llvm libelf-dev libpcap-dev gcc-multilib build-essential
 #+end_example
 
 To install the 'perf' utility, run this on Debian:
@@ -104,7 +105,7 @@ or this on Ubuntu:
 On a machine running the openSUSE distribution, install the packages:
 
 #+begin_example
- $ sudo zypper install clang llvm libelf-devel perf
+ $ sudo zypper install clang llvm libelf-devel libpcap-devel perf
 #+end_example
 
 * Kernel headers dependency