+ * zlib (http://www.zlib.net/).
+
+ * libxml2 (http://xmlsoft.org/).
+
+ * gettext version 0.20 or later.
+
+The following packages are required to enable PSPPIRE, the graphical
+user interface for PSPP. If you cannot install them or do not wish to
+use the GUI, you must run `configure' with --without-gui.
+
+ * pkg-config (http://pkg-config.freedesktop.org/wiki/). Versions
+ 0.18 and 0.19 have a bug that will prevent library detection,
+ but other versions should be fine.
+
+ * GTK+ (http://www.gtk.org/), version 3.22.0 or later.
+
+ * GtkSourceView (http://projects.gnome.org/gtksourceview/)
+ version 3.x (3.4.2 or later) or 4.x.
+
+ * GNU Spread Sheet Widget (http://www.gnu.org/software/ssw)
+ version 0.7 or later.
+
+The following packages are only needed to build and test the Perl
+module:
+
+ * Perl (https://www.perl.org/), version 5.005_03 or later.
+
+ * The Config::Perl::V module for Perl (https://cpan.org).
+
+ * Optionally, the Text::Diff module for Perl
+ (https://cpan.org). This module enables PSPP to test its Perl
+ module more thoroughly.
+
+Other optional packages:
+
+ * libreadline and libhistory
+ (http://tiswww.case.edu/php/chet/readline/rltop.html). Without
+ them, interactive command editing and history features in the
+ text-based user interface will be disabled.
+
+ * Texinfo (http://www.gnu.org/software/texinfo/), version 4.7 or
+ later. Installing Texinfo will allow you to build PSPP
+ documentation in PostScript or PDF format.
+
+ * libpq, from Postgresql (http://postgresql.org). This enables PSPP
+ to read Postgresql databases. The tests for the Postgresql
+ interface, but not the Postgresql interface itself, requires the
+ Postgresql server to be installed.