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+@c Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+@c This is part of the GCC manual.
+@c For copying conditions, see the file gcc.texi.
+
+@node Header Dirs
+@chapter Standard Header File Directories
+
+@code{GCC_INCLUDE_DIR} means the same thing for native and cross.  It is
+where GNU CC stores its private include files, and also where GNU CC
+stores the fixed include files.  A cross compiled GNU CC runs
+@code{fixincludes} on the header files in @file{$(tooldir)/include}.
+(If the cross compilation header files need to be fixed, they must be
+installed before GNU CC is built.  If the cross compilation header files
+are already suitable for ISO C and GNU CC, nothing special need be
+done).
+
+@code{GPLUSPLUS_INCLUDE_DIR} means the same thing for native and cross.  It
+is where @code{g++} looks first for header files.  The C++ library
+installs only target independent header files in that directory.
+
+@code{LOCAL_INCLUDE_DIR} is used only by native compilers.  GNU CC
+doesn't install anything there.  It is normally
+@file{/usr/local/include}.  This is where local additions to a packaged
+system should place header files.
+
+@code{CROSS_INCLUDE_DIR} is used only by cross compilers.  GNU CC
+doesn't install anything there.
+
+@code{TOOL_INCLUDE_DIR} is used for both native and cross compilers.  It
+is the place for other packages to install header files that GNU CC will
+use.  For a cross-compiler, this is the equivalent of
+@file{/usr/include}.  When you build a cross-compiler,
+@code{fixincludes} processes any header files in this directory.