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All interfaces (data types and functions) of the library are defined in the header file `gpgme.h'. You must include this in all programs using the library, either directly or through some other header file, like this:
#include <gpgme.h>
The name space of GPGME is gpgme_* for function names
and data types and GPGME_* for other symbols. Symbols internal
to GPGME take the form _gpgme_* and _GPGME_*.
Because GPGME makes use of the GPG Error library, using
GPGME will also use the GPG_ERR_* name space
directly, and the gpg_err* and gpg_str* name space
indirectly.