C files making use of gtk+3 widgets

Compile with:
gcc `pkg-config --cflags gtk+-3.0` -o <output file> <input file.c> `pkg-config --libs gtk+-3.0` -lm

Note: must have gcc and gtk+3

Source code may also be compiled following extraction from tarballs with the following:
$ ./configure
$ make
$ make install

Extract tarball with:
$ tar -xvf <filename> -C <directory>

Or, you can leave off -C and just extract to the current working directory.