Make sure we have iconv.h before building with it
diff --git a/src/stdlib/SDL_iconv.c b/src/stdlib/SDL_iconv.c
index a5fc1ec..34bcd84 100644
--- a/src/stdlib/SDL_iconv.c
+++ b/src/stdlib/SDL_iconv.c
@@ -30,7 +30,7 @@
#include "SDL_stdinc.h"
#include "SDL_endian.h"
-#ifdef HAVE_ICONV
+#if defined(HAVE_ICONV) && defined(HAVE_ICONV_H)
#include <iconv.h>
/* Depending on which standard the iconv() was implemented with,