[Bug 694416] New: Passing of $AS, etc to libav configure breaks on some platforms

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=694416
  GStreamer | gst-libav | git

           Summary: Passing of $AS, etc to libav configure breaks on some
                    platforms
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-libav
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


http://cgit.freedesktop.org/gstreamer/gst-libav/commit/configure.ac?id=faa23b57b824bd9e4f7177691f17b2056967c9e8

This commit makes cross-compilation and using alternative toolchains much
easier but OTOH breaks on Raspberry Pi at least:

[...]
config.status: executing libtool commands
config.status: executing configure-embedded-libav commands
Configuring included Libav instance with args --prefix=NONE --disable-avserver
--disable-avplay        --disable-avconv --disable-avprobe --enable-static
--enable-pic     --disable-encoder=flac --disable-decoder=cavs
--disable-protocols --disable-devices    --disable-network --disable-hwaccels
--disable-filters --disable-doc    --enable-optimizations --enable-gpl
--ar="$AR" --as="$AS" --cc="$CC" --ld="$CC" --nm="$NM" 
GNU assembler not found, install gas-preprocessor

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
libav-user at libav.org mailing list or IRC #libav on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solving the problem.
config.status: error: Failed to configure embedded Libav tree
  configure failed


config.log says that these variables are set to:
AR='ar'
AS='as'
CC='gcc -std=gnu99'
NM='/usr/bin/nm -B'

This looks valid and I don't really know where the problem is

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