diff --git a/cfg/zlib.cfg b/cfg/zlib.cfg
new file mode 100644
index 000000000..2bc85178f
--- /dev/null
+++ b/cfg/zlib.cfg
@@ -0,0 +1,51 @@
+<?xml version="1.0"?>
+<def format="2">
+  <!-- Reference to zlib documention https://www.zlib.net/manual.html -->
+  <define name="Z_OK" value="0"/>
+  <define name="Z_STREAM_END" value="1"/>
+  <define name="Z_NEED_DICT" value="2"/>
+  <define name="Z_ERRNO" value="(-1)"/>
+  <define name="Z_STREAM_ERROR" value="(-2)"/>
+  <define name="Z_DATA_ERROR" value="(-3)"/>
+  <define name="Z_MEM_ERROR" value="(-4)"/>
+  <define name="Z_BUF_ERROR" value="(-5)"/>
+  <define name="Z_VERSION_ERROR" value="(-6)"/>
+  <define name="Z_OK" value="0"/>
+  <define name="Z_STREAM_END" value="1"/>
+  <define name="Z_NEED_DICT" value="2"/>
+  <define name="Z_ERRNO" value="(-1)"/>
+  <define name="Z_STREAM_ERROR" value="(-2)"/>
+  <define name="Z_DATA_ERROR" value="(-3)"/>
+  <define name="Z_MEM_ERROR" value="(-4)"/>
+  <define name="Z_BUF_ERROR" value="(-5)"/>
+  <define name="Z_VERSION_ERROR" value="(-6)"/>
+  <define name="Z_NO_COMPRESSION" value="0"/>
+  <define name="Z_BEST_SPEED" value="1"/>
+  <define name="Z_BEST_COMPRESSION" value="9"/>
+  <define name="Z_DEFAULT_COMPRESSION" value="(-1)"/>
+  <define name="Z_FILTERED" value="1"/>
+  <define name="Z_HUFFMAN_ONLY" value="2"/>
+  <define name="Z_RLE" value="3"/>
+  <define name="Z_FIXED" value="4"/>
+  <define name="Z_DEFAULT_STRATEGY" value="0"/>
+  <define name="Z_BINARY" value="0"/>
+  <define name="Z_TEXT" value="1"/>
+  <define name="Z_ASCII" value="Z_TEXT"/>
+  <define name="Z_UNKNOWN" value="2"/>
+  <define name="Z_DEFLATED" value="8"/>
+  <define name="Z_NULL" value="0"/>
+  <!-- ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); -->
+  <function name="gzerror">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <use-retval/>
+    <arg nr="1">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+  </function>
+</def>