zlib: No visualization attributes. The visibility attribute is a headache on many platforms like Solaris, and not even supported on Windows.
diff --git a/deps/zlib/zconf.h b/deps/zlib/zconf.h
index 494992a..683cba8 100644
--- a/deps/zlib/zconf.h
+++ b/deps/zlib/zconf.h
@@ -12,6 +12,7 @@
#define NO_GZIP
#define STDC
+#define NO_VIZ
/* Jeez, don't complain about non-prototype
* forms, we didn't write zlib */