FLTK 2.0 is an experimental new version of the library that was later abandoned. Some other libraries seem to use it, so sometimes you may need to build and install it. Doing that is easy:
Download the source code from the SVN repository:
$ svn co http://seriss.com/public/fltk/fltk/trunk fltk-2.0
If it asks for username or password, just press Enter.
Configure and build the code:
$ cd fltk-2.0 $ autoconf $ ./configure $ make
You might get this error:
=== making test === Compiling mandelbrot_ui.cxx… In file included from mandelbrot_ui.cxx:3:0: mandelbrot_ui.h:15:5: error: ‘Drawing_Area’ does not name a type
Open Makefile and remove test from this line:
<code>DIRS = src $(LOCALIMAGES) images OpenGL fluid glut test
</code>Build again, it should succeed. Install the files:
$ make $ sudo make install
Tried with: Ubuntu 12.04 LTS