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  68. <a name="Standard-Header-File-Directories"></a>
  69. <h2 class="chapter">21 Standard Header File Directories</h2>
  70. <p><code>GCC_INCLUDE_DIR</code> means the same thing for native and cross. It is
  71. where GCC stores its private include files, and also where GCC
  72. stores the fixed include files. A cross compiled GCC runs
  73. <code>fixincludes</code> on the header files in <samp>$(tooldir)/include</samp>.
  74. (If the cross compilation header files need to be fixed, they must be
  75. installed before GCC is built. If the cross compilation header files
  76. are already suitable for GCC, nothing special need be done).
  77. </p>
  78. <p><code>GPLUSPLUS_INCLUDE_DIR</code> means the same thing for native and cross. It
  79. is where <code>g++</code> looks first for header files. The C++ library
  80. installs only target independent header files in that directory.
  81. </p>
  82. <p><code>LOCAL_INCLUDE_DIR</code> is used only by native compilers. GCC
  83. doesn&rsquo;t install anything there. It is normally
  84. <samp>/usr/local/include</samp>. This is where local additions to a packaged
  85. system should place header files.
  86. </p>
  87. <p><code>CROSS_INCLUDE_DIR</code> is used only by cross compilers. GCC
  88. doesn&rsquo;t install anything there.
  89. </p>
  90. <p><code>TOOL_INCLUDE_DIR</code> is used for both native and cross compilers. It
  91. is the place for other packages to install header files that GCC will
  92. use. For a cross-compiler, this is the equivalent of
  93. <samp>/usr/include</samp>. When you build a cross-compiler,
  94. <code>fixincludes</code> processes any header files in this directory.
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