--- a/gcc/ada/doc/gnat_ugn/platform_specific_information.rst	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/ada/doc/gnat_ugn/platform_specific_information.rst	Thu Oct 25 07:37:49 2018 +0900
@@ -219,6 +219,36 @@
 It gets the effective user id, and if it's not 0 (i.e. root), it raises
 Program_Error.
 
+.. index:: Linux
+.. index:: GNU/Linux
+
+.. _GNU_Linux_Topics:
+
+GNU/Linux Topics
+================
+
+This section describes topics that are specific to GNU/Linux platforms.
+
+.. _Required_packages_on_GNU_Linux:
+
+Required Packages on GNU/Linux
+------------------------------
+
+GNAT requires the C library developer's package to be installed.
+The name of of that package depends on your GNU/Linux distribution:
+
+* RedHat, SUSE: ``glibc-devel``;
+* Debian, Ubuntu: ``libc6-dev`` (normally installed by default).
+
+If using the 32-bit version of GNAT on a 64-bit version of GNU/Linux,
+you'll need the 32-bit version of the following packages:
+
+* RedHat, SUSE: ``glibc.i686``, ``glibc-devel.i686``, ``ncurses-libs.i686``
+* Debian, Ubuntu: ``libc6:i386``, ``libc6-dev:i386``, ``lib32ncursesw5``
+
+Other GNU/Linux distributions might be choosing a different name
+for those packages.
+
 .. index:: Windows
 
 .. _Microsoft_Windows_Topics: