[AD] Problem Building 4.9 SVN

["Michael Swiger" <mokkan@xxxxxxxxxx>]

Today, I checked out a fresh copy of 4.9 from the SVN repository and
tried to build it. My environment is Windows XP Pro, and my compiler
is an unofficial build of MinGW (gcc 4.3.2-tdm-1). It gave me the
following:

[ 23%] Building C object CMakeFiles/allegro_shared.dir/src/win/wgl_disp.c.obj
Linking CXX shared library lib\liballegro-4.9.6.dll
Creating library file: lib\liballegro-4.9.6.dll.a
Warning: .drectve `/DEFAULTLIB:"uuid.lib" /DEFAULTLIB:"uuid.lib" ' unrecognized
Warning: .drectve `/DEFAULTLIB:"uuid.lib" /DEFAULTLIB:"uuid.lib" ' unrecognized
Warning: .drectve `/DEFAULTLIB:"uuid.lib" /DEFAULTLIB:"uuid.lib" ' unrecognized
Warning: .drectve `/DEFAULTLIB:"uuid.lib" /DEFAULTLIB:"uuid.lib" ' unrecognized
CMakeFiles\allegro_shared.dir\src\events.c.obj:events.c:(.text+0x2a): undefined
reference to `___sync_sub_and_fetch_4'
CMakeFiles\allegro_shared.dir\src\inline.c.obj:inline.c:(.text+0x116): undefined
 reference to `___sync_sub_and_fetch_4'
CMakeFiles\allegro_shared.dir\src\inline.c.obj:inline.c:(.text+0x12a): undefined
 reference to `___sync_fetch_and_add_4'
collect2: ld returned 1 exit status
mingw32-make[2]: *** [lib/liballegro-4.9.6.dll] Error 1
mingw32-make[1]: *** [CMakeFiles/allegro_shared.dir/all] Error 2
mingw32-make: *** [all] Error 2

Anyone know what's going on? 4.9 built for me just fine a few weeks ago...