--- qt-everywhere-src-5.15.14.old/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/compression_utils_portable.h
+++ qt-everywhere-src-5.15.14/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/compression_utils_portable.h
@@ -19,6 +19,10 @@
 #include "zlib.h"
 #endif
 
+#ifndef uLong
+#define uLong unsigned long
+#endif
+
 namespace zlib_internal {
 
 enum WrapperType {
--- qt-everywhere-src-5.15.14.old/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/zip.h
+++ qt-everywhere-src-5.15.14/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/zip.h
@@ -17,6 +17,10 @@
 #include "base/time/time.h"
 #include "build/build_config.h"
 
+#ifndef uLong
+#define uLong unsigned long
+#endif
+
 namespace base {
 class File;
 }
--- qt-everywhere-src-5.15.14.old/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/zip_internal.cc
+++ qt-everywhere-src-5.15.14/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/zip_internal.cc
@@ -31,6 +31,10 @@
 #endif  // defined(OS_POSIX)
 #endif  // defined(USE_SYSTEM_MINIZIP)
 
+#ifndef uLong
+#define uLong unsigned long
+#endif
+
 namespace {
 
 #if defined(OS_WIN)
==== end of patch ====
--- qt-everywhere-src-5.15.14.old/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/compression_utils_portable.cc
+++ qt-everywhere-src-5.15.14/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/compression_utils_portable.cc
@@ -11,6 +11,20 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifndef Z_DEFAULT_STRATEGY
+#define Z_NO_COMPRESSION         0
+#define Z_BEST_SPEED             1
+#define Z_BEST_COMPRESSION       9
+#define Z_DEFAULT_COMPRESSION  (-1)
+/* compression levels */
+
+#define Z_FILTERED            1
+#define Z_HUFFMAN_ONLY        2
+#define Z_RLE                 3
+#define Z_FIXED               4
+#define Z_DEFAULT_STRATEGY    0
+#endif
+
 namespace zlib_internal {
 
 // The difference in bytes between a zlib header and a gzip header.
==== end of patch ====
--- qt-everywhere-src-5.15.14.old/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/zip_internal.cc
+++ qt-everywhere-src-5.15.14/qtwebengine/src/3rdparty/chromium/third_party/zlib/google/zip_internal.cc
@@ -31,6 +31,20 @@
 #endif  // defined(OS_POSIX)
 #endif  // defined(USE_SYSTEM_MINIZIP)
 
+#ifndef Z_DEFAULT_STRATEGY
+#define Z_NO_COMPRESSION         0
+#define Z_BEST_SPEED             1
+#define Z_BEST_COMPRESSION       9
+#define Z_DEFAULT_COMPRESSION  (-1)
+/* compression levels */
+
+#define Z_FILTERED            1
+#define Z_HUFFMAN_ONLY        2
+#define Z_RLE                 3
+#define Z_FIXED               4
+#define Z_DEFAULT_STRATEGY    0
+#endif
+
 namespace {
 
 #if defined(OS_WIN)
==== end of patch ====