Beyond Linux® From Scratch (systemd Edition) - Version r13.0-349

Chapter 25. Graphical Environment Libraries

FLTK-1.4.4

Introduction to FLTK

FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit. FLTK provides modern GUI functionality and supports 3D graphics via OpenGL and its built-in GLUT emulation libraries used for creating graphical user interfaces for applications.

[Note]

Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

Additional Downloads

FLTK Dependencies

Required

Xorg Libraries

Recommended

GLU-9.0.3, hicolor-icon-theme-0.18, libjpeg-turbo-3.1.4.1, and libpng-1.6.57

Optional

alsa-lib-1.2.15.3, desktop-file-utils-0.28, Doxygen-1.16.1, and texlive-20250308 (or install-tl-unx)

Installation of FLTK

[Note]

Note

The tar extraction directory is fltk-1.4.4 and not fltk-1.4.4-source as indicated by the tarball name.

Install FLTK by running the following commands: 

mkdir build &&
cd    build &&

cmake -D CMAKE_INSTALL_PREFIX=/usr \
      -D FLTK_BUILD_SHARED_LIBS=ON \
      -D CMAKE_BUILD_TYPE=Release  \
      -G "Ninja" ..                &&
ninja

If you wish to create the API documentation, issue: 

ninja documentation/html

The tests for the package are interactive. To execute the tests, run bin/test/unittests. In addition, there are about 110 other executable test programs in the bin/test directory that can be run individually.

Now, install the package and remove unneeded static libraries. As the root user: 

ninja install &&
rm -vf /usr/lib/libfltk*.a

If you have built the documentation, install it as the root user: 

install -vdm 755          /usr/share/doc/fltk-1.4.4 &&
cp -Rv documentation/html /usr/share/doc/fltk-1.4.4

Otherwise, if you downloaded the optional html documentation, install it as the root user: 

install -vdm 755 /usr/share/doc/fltk-1.4.4 &&
tar -C /usr/share/doc/fltk-1.4.4 --strip-components=4 -xf ../../fltk-1.4.4-docs-html.tar.gz

Command Explanations

-D FLTK_BUILD_SHARED_LIBS=ON: Build and install shared libraries in addition to static ones.

Contents

Installed Programs: blocks, checkers, fltk-config, fltk-options, fltk-options-shared, fluid, fluid-shared, glpuzzle, and sudoku
Installed Libraries: libfltk.so, libfltk_forms.so, libfltk_gl.so, and libfltk_images.so
Installed Directories: /usr/include/FL, /usr/share/fltk, and /usr/share/doc/fltk-1.4.4 (optional)

Short Descriptions

blocks

is a FLTK-based block elimination game

checkers

is a FLTK-based version of the game of checkers

fltk-config

is a utility script that can be used to get information about the current version of FLTK that is installed on the system

fltk-options

is a graphical configuration utility for FLTK applications

fltk-options-shared

is a graphical configuration utility for FLTK applications (dynamically linked to shared libfltk libraries)

fluid

is an interactive GUI designer for FLTK

fluid-shared

is an interactive GUI designer for FLTK (dynamically linked to shared libfltk libraries)

glpuzzle

is an implementation of the Klotski game

sudoku

is an implementation of the popular Sudoku game

libfltk.so

contains functions that provide an API to implement graphical user interfaces