(gcrypt.info) Initializing the library

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 Initializing the library
 ========================
 
 It is often desirable to check that the version of `Libgcrypt' used is
 indeed one which fits all requirements.  Even with binary compatibility
 new features may have been introduced but due to problem with the
 dynamic linker an old version is actually used.  So you may want to
 check that the version is okay right after program startup.
 
  - Function: const char *gcry_check_version (const char *REQ_VERSION)
      The function `gcry_check_version' has three purposes.  It can be
      used to retrieve the version number of the library.  In addition it
      can verify that the version number is higher than a certain
      required version number.
 
      In either case, the function initializes some sub-systems, and for
      this reason alone it must be invoked early in your program, before
      you make use of the other functions of Libgcrypt.
 
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