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* configure.ac (HAVE_LIBTSS): New acdefine and am_conditional. * agent/Makefile.am: (gpg_agent_SOURCES): Move tpm files to ... (gpg_agent_SOURCES) [HAVE_LIBTSS]: ... here. * agent/agent.h (divert_tpm2_pksign, divert_tpm2_pkdecrypt) (divert_tpm2_writekey) [!HAVE_LIBTSS]: Add stub functions. -- This adds a configure stanza to check for the necessary libtss to support TPM functions. If found, the library functions will be dynamically loaded, meaning that a system built with TPM2 support will still execute correctly (obviously minus TPM2 support) if installed without libtss being present. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>