Compilation failure with gcc 4.4.7

[Justus Winter]

Hello,

I just tried to compile notmuch with an oldish compiler, and that
failed (if the compiler is indeed too old, then at least the error
message should be more helpful):

% ./configure --prefix=$HOME/stow/notmuch
[...]
Sanity checking C compilation environment... OK.
Sanity checking C++ compilation environment... OK.
Reading libnotmuch version from source...
*** Error: Reading lib/notmuch.h failed.
Please try running configure again in a clean environment, and if the
problem persists, report a bug.
% cc -g -O2 _libversion.c -o _lib
In file included from _libversion.c:2:
lib/notmuch.h:858: error: wrong number of arguments specified for ‘deprecated’ attribute
lib/notmuch.h:915: error: wrong number of arguments specified for ‘deprecated’ attribute
lib/notmuch.h:1011: error: wrong number of arguments specified for ‘deprecated’ attribute
lib/notmuch.h:1048: error: wrong number of arguments specified for ‘deprecated’ attribute
% gcc --version
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-16)
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Cheers,
Justus
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