Based on a patch by Ramiro.

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where all other such dependencies are declared.

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This is like foo_select, except the selected options being disabled
does not disable foo.

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These functions enable/disable their options if these are unset,
leaving their old values otherwise.

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If an option 'foo' is enabled, all options listed in foo_select
are automatically enabled, unless explicitly disabled.  In the
latter case, foo is also disabled.

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Some compilers output a new rule for each dependency.  We must prefix
each one with the directory name.

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Neither the asm() nor the __asm__() keyword is part of the C99
standard, but while GCC accepts the former in C89 syntax, it is not
accepted in C99 unless GNU extensions are turned on (with -fasm). The
latter form is accepted in any syntax as an extension (without
requiring further command-line options).

Sun Studio C99 compiler also does not accept asm() while accepting
__asm__(), albeit reporting warnings that it's not valid C99 syntax.

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This made dependencies entirely non-functional, and also the syntax is
not supported by gcc 2.95.

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the -MT option as suggested by Ramiro.

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This part of the configure script might be run by non-POSIX shells.

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require_cpp_condition().

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the --version option.
patch by Diego 'Flameeyes' Pettenò, flameeyes gmail com

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patch by Diego 'Flameeyes' Pettenò  flameeyes _at_ gmail

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FFmpeg's version string output. This can be used by distributions to mark
their packages as being modified versions without hacking the sources.

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