| [CMake](http://www.cmake.org) | CMake, the cross-platform, open-source build system. CMake is a family of tools designed to build, test and package software. |
| [M4](http://www.gnu.org/software/m4/m4.html) | GNU M4 is an implementation of the traditional Unix macro processor. It is mostly SVR4 compatible although it has some extensions (for example, handling more than 9 positional parameters to macros). GNU M4 also has built-in functions for including files, running shell commands, doing arithmetic, etc. |
| [ncurses](http://www.gnu.org/software/ncurses/) | The Ncurses (new curses) library is a free software emulation of curses in System V Release 4.0, and more. It uses Terminfo format, supports pads and color and multiple highlights and forms characters and function-key mapping, and has all the other SYSV-curses enhancements over BSD Curses. |
| [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/) | pkg-config is a helper tool used when compiling applications and libraries. It helps you insert the correct compiler options on the command line so an application can use gcc -o test test.c `pkg-config --libs --cflags glib-2.0` for instance, rather than hard-coding values on where to find glib (or other libraries). |
| [squashfs-tools](http://squashfs.sourceforge.net/) | Squashfs is a compressed read-only filesystem for Linux. |