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 If you want to compile a source file including the `gcrypt.h' header
 file, you must make sure that the compiler can find it in the directory
 hierarchy.  This is accomplished by adding the path to the directory in
 which the header file is located to the compilers include file search
 path (via the `-I' option).
 
    However, the path to the include file is determined at the time the
 source is configured.  To solve this problem, `Libgcrypt' ships with a
 small helper program `libgcrypt-config' that knows the path to the
 include file and other configuration options.  The options that need to
 be added to the compiler invocation at compile time are output by the
 `--cflags' option to `libgcrypt-config'.  The following example shows
 how it can be used at the command line:
 
      gcc -c foo.c `libgcrypt-config --cflags`
 
    Adding the output of `libgcrypt-config --cflags' to the compilers
 command line will ensure that the compiler can find the `Libgcrypt'
 header file.
 
    A similar problem occurs when linking the program with the library.
 Again, the compiler has to find the library files.  For this to work,
 the path to the library files has to be added to the library search path
 (via the `-L' option).  For this, the option `--libs' to
 `libgcrypt-config' can be used.  For convenience, this option also
 outputs all other options that are required to link the program with
 the `Libgcrypt' libraries (in particular, the `-lgcrypt' option).  The
 example shows how to link `foo.o' with the `Libgcrypt' library to a
 program `foo'.
 
      gcc -o foo foo.o `libgcrypt-config --libs`
 
    Of course you can also combine both examples to a single command by
 specifying both options to `libgcrypt-config':
 
      gcc -o foo foo.c `libgcrypt-config --cflags --libs`
 
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