And make sure to check INTER_BLOCK as had been fixed by Michael
Niedermayer.

Reported-By: Andreas Cadhalpun
CC: libav-stable@libav.org

Checking this struct is a bit more natural for this dependency.
Signed-off-by: Martin Storsjö <martin@martin.st>

These are only necessary once/if avconv gets support for this hwaccel.
While that obviously is desireable, we don't have it yet, and they
currently only are a distraction.
Signed-off-by: Martin Storsjö <martin@martin.st>

This fixes the side effect of printing the whole environment,
if no --env parameter was provided.
Signed-off-by: Martin Storsjö <martin@martin.st>

This was a regression introduced with d8ffb205.
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

Makes the life of the people already setting PKG_CONFIG_PATH simpler.

Useful to have `make config` work with custom pkgconf path.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Make possible to require a combination of
packages and/or pin specific versions.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

The only need to be listed if they are to be used in ifdefs from
within the code - config items used as dependencies only within
configure don't need to be exported.
Signed-off-by: Martin Storsjö <martin@martin.st>

This fixes dxva2 detection (i.e. correctly realizes that it isn't
available) for WinRT, where dxva2api.h does exist, but these definitions
are omitted (when targeting the API subsets).

Ideally we should rather check for e.g. DXVA2_ConfigPictureDecode,
but configure might fail to find that definition due to _WIN32_WINNT
not being set to the right value during configure. (libavcodec/dxva2.h
manually overrides the _WIN32_WINNT define.)

This allows removing hardcoded --disable-dxva2 from such build
configurations.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Fixes build with some mingw-w64 versions, that have got the header
but not the interface declaration.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

mpz_import and mpz_export were added in GMP 4.1, in 2002.

This simplifies the DH code by clarifying that it only uses pure
bignum functions, no other parts of nettle/hogweed.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Partially based on the work of Timo Rothenpieler <timo@rothenpieler.org>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>