Beyond Linux® From Scratch (systemd Edition) - Version r12.2-856

Chapter 25. Graphical Environment Libraries

Pango-1.55.0

Introduction to Pango

Pango is a library for laying out and rendering text, with an emphasis on internationalization. It can be used anywhere that text layout is needed, though most of the work on Pango so far has been done in the context of the GTK+ widget toolkit.

[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

Pango Dependencies

Required

Fontconfig-2.15.0 (must be built with FreeType-2.13.3 using harfBuzz-10.1.0), FriBidi-1.0.16, and GLib-2.82.4 (GObject Introspection required for GNOME)

Recommended

Cairo-1.18.2 (built after harfBuzz-10.1.0) and Xorg Libraries

Optional

Gi-DocGen-2024.1 (to generate documentation), help2man, libthai, and sysprof

Installation of Pango

Install Pango by running the following commands: 

mkdir build &&
cd    build &&

meson setup --prefix=/usr          \
            --buildtype=release    \
            --wrap-mode=nofallback \
            ..                     &&
ninja

If you have Gi-DocGen-2024.1 installed and wish to build the API documentation for this package, issue: 

sed "/docs_dir =/s@\$@ / 'pango-1.55.0'@" -i ../docs/meson.build &&
meson configure -D documentation=true                            &&
ninja

To test the results, issue: ninja test. One test named testboundaries_ucd is known to fail because it expects Unicode 16.0 support from Glib 2.83 or newer.

Now, as the root user: 

ninja install

Command Explanations

--buildtype=release: Specify a buildtype suitable for stable releases of the package, as the default may produce unoptimized binaries.

-D introspection=disabled: Use this switch if you do not want to use GObject Introspection.

--wrap-mode=nofallback: This switch prevents meson from using subproject fallbacks for any dependency declarations in the build files, preventing it from downloading any optional dependencies which are not installed on the system.

Configuring Pango

Config Files

/etc/pango/pangorc, ~/.pangorc and the file specified in the environment variable PANGO_RC_FILE

Contents

Installed Programs: pango-list, pango-segmentation, and pango-view
Installed Libraries: libpango-1.0.so, libpangocairo-1.0.so, libpangoft2-1.0.so, and libpangoxft-1.0.so
Installed Directories: /usr/include/pango-1.0 and /usr/share/doc/pango-1.55.0 (if gi-docgen is available)

Short Descriptions

pango-list

displays a list of fonts that Pango can use that are currently installed on the system

pango-segmentation

shows text segmentation as determined by Pango.

pango-view

renders a given text file through Pango for viewing purposes

libpango-1.0.so

contains low level layout rendering routines, a high level driver for laying out entire blocks of text, and routines to assist in editing internationalized text