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Use our own check which also recognizes static inline functions

Don't use ac_cv_search cached value because it could contain
"no" or "none required" which aren't valid link flags

AC_CHECK_LIB(main, xxx) did not exactly search for main symbol, it
searched for the presence of the library.
Instead we look for a required symbol.

We don't use e.g. pthread_mutex_lock because some pthread symbols
are available in glibc, but not all.

Not finding pthread library is not an error, because at least OS/2 and
symbian don't need it. (We skip the check on Windows already)

You should use them like this:
- modify *FLAGS and LIBS globally
- use VLC_SAVE_FLAGS to push the variables
- modify the variables for the tests
- use VLC_RESTORE_FLAGS when you're done to pop the variables

contrib's dvdread is patched and the patch is being upstreamed

    The AM_CONDITIONAL call for HAVE_QTKIT has had a bug since
    3ddb9e51, where a 'test' invocation was elided. On MacOS X
    10.7.2 this caused the configure script to hang with an
    obscure launchd message:

      launch_msg("CheckIn") IPC failure: Operation not permitted

    This patch restores the intended logic.
Signed-off-by: Rafaël Carré <funman@videolan.org>

Else dvdread libs end up being "-ldvdcss .. -ldvdread"

simplify

Also add missing libraries for darwin

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

This reverts commit ebf341dc.

We can't force a prefix at make install with DESTDIR
files are installed in $(DESTDIR)/$(prefix) not $(DESTDIR)

This also breaks OSX binaries, and thus test suite (is that libtool's fault?)

This reverts commit ec76c41b.

fix vim syntax highlighting

This should really be cleaned up...