Fix compilation with --solo and --debug combined.

However this ends up not really being solo, since it has to
include external libraries.

1 files changed, 1 insertions, 1 deletions

diff --git a/zutil.c b/zutil.c
index 3b4d904..56534fb 100644
--- a/zutil.c
+++ b/zutil.c
@@ -113,7 +113,7 @@ uLong ZEXPORT zlibCompileFlags()
 }
 
 #ifdef ZLIB_DEBUG
-
+#include <stdlib.h>
 #  ifndef verbose
 #    define verbose 0
 #  endif