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$ gcc -v
Using built-in specs.
...
Configured with: ../gcc-4.5.2/configure --enable-languages=c,c++,ada,f
+ortran,objc,obj-c++ --disable-sjlj-exceptions --with-dwarf2 --enable-
+shared --enable-libgomp --disable-win32-registry --enable-libstdcxx-d
+ebug --enable-version-specific-runtime-libs --disable-werror --build=
+mingw32 --prefix=/mingw
Thread model: win32
gcc version 4.5.2 (GCC)

C:\MinGW\include\dirent.h
C:\MinGW\share\libtool\libltdl\lt__dirent.c
C:\MinGW\share\libtool\libltdl\libltdl\lt__dirent.h

warning: incompatible implicit declaration of built-in function 'alloc
+a'

On Thu, Sep 16, 2004 at 08:55:50AM -0400, Kaveh R. Ghazi wrote:
> +/* GCC always provides __builtin_alloca(x).  */
...
> +#endif

Should be #undef, not #ifndef.