doc: Update use of Autoconf with PKG_CHECK_MODULES.
-- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
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@ -589,10 +589,16 @@ mode (@code{_LARGEFILE64_SOURCE}).
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@cindex automake
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@cindex automake
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@cindex autoconf
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@cindex autoconf
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It is much easier if you use GNU Automake instead of writing your own
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You can simply use @code{PKG_CHECK_MODULES} macro with @command{pkg-config}:
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Makefiles. If you do that you do not have to worry about finding and
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@example
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invoking the @command{pkg-config} script at all. @acronym{GPGME}
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PKG_CHECK_MODULES([GPGME], [gpgme >= 1.23.1])
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provides an extension to Automake that does all the work for you.
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@end example
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Alternatively, instead of using @command{pkg-config}, for building on
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an environment with no pkg-config, @acronym{GPGME} provides an
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extension to Automake that does all the work for you. Please note
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that it is required to have gpgrt-config from libgpg-error installed
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in this case.
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@c A simple macro for optional variables.
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@c A simple macro for optional variables.
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@macro ovar{varname}
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@macro ovar{varname}
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