A few fixes to get this building on Linux again

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401335

include/SDL_config.h

@@ -32,14 +32,26 @@
 #ifdef HAVE_LIBC
 
 /* Various C library headers */
+#ifndef HAVE_CTYPE_H
 #define HAVE_CTYPE_H
+#endif
+#ifndef HAVE_STDIO_H
 #define HAVE_STDIO_H
+#endif
+#ifndef HAVE_STDLIB_H
 #define HAVE_STDLIB_H
+#endif
+#ifndef HAVE_MALLOC_H
 #define HAVE_MALLOC_H
+#endif
+#ifndef HAVE_STRING_H
 #define HAVE_STRING_H
+#endif
 #if !defined(_WIN32_WCE)
+#ifndef HAVE_SIGNAL_H
 #define HAVE_SIGNAL_H
 #endif
+#endif /* !_WIN32_WCE */
 
 /* Features provided by SDL_stdlib.h */
 #if !defined(_WIN32) /* Don't use C runtime versions of these on Windows */
@@ -49,7 +61,9 @@
 #define HAVE_MALLOC
 #define HAVE_REALLOC
 #define HAVE_FREE
+#ifndef HAVE_ALLOCA
 #define HAVE_ALLOCA
+#endif
 /*#define HAVE_QSORT*/
 
 /* Features provided by SDL_string.h */

src/audio/alsa/SDL_alsa_audio.c

@@ -43,8 +43,10 @@
 
 #ifdef ALSA_DYNAMIC
 #ifdef USE_DLVSYM
+#ifndef __USE_GNU
 #define __USE_GNU
 #endif
+#endif
 #include <dlfcn.h>
 #include "SDL_name.h"
 #include "SDL_loadso.h"

src/stdlib/SDL_getenv.c

@@ -23,6 +23,7 @@
 #include "SDL_stdlib.h"
 #include "SDL_string.h"
 
+#ifndef HAVE_GETENV
 
 #if defined(WIN32) && !defined(_WIN32_WCE)
 
@@ -173,6 +174,8 @@ char *SDL_getenv(const char *name)
 
 #endif /* WIN32 */
 
+#endif /* !HAVE_GETENV */
+
 #ifdef TEST_MAIN
 #include <stdio.h>