$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/4.5.2/lto-wrapper.exe
Target: mingw32
Configured with: ../gcc-4.5.2/configure --enable-languages=c,c++,ada,fortran,objc,obj-c++ --disable-sjlj-exceptions --with-dwarf2 --enable-shared --enable-libgomp --disable-win32-registry --enable-libstdcxx-debug --enable-version-specific-runtime-libs --disable-werror --build=mingw32 --prefix=/mingw
Thread model: win32
gcc version 4.5.2 (GCC) 

##</code><code>##

C:\MinGW\include\dirent.h
C:\MinGW\share\libtool\libltdl\lt__dirent.c
C:\MinGW\share\libtool\libltdl\libltdl\lt__dirent.h
##</code><code>##

warning: incompatible implicit declaration of built-in function 'alloca'

##</code><code>##

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

Should be #undef, not #ifndef.