default-sig-expire in libgpgme?

[Daniel Kahn Gillmor]

hi gnupg folks--

i'd like to be able to set an expiration on data signatures made from
libgpgme, but i don't see any way to set the equivalent of
set-default-expire via the gpgme interface.

is there a way to do it, or is this feature not exposed through gpgme?

pointers welcome, including advice on how i could have searched for or
answered this question myself from the existing documentation.

regards,

	--dkg

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