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diff --git a/modules/freetype2/include/freetype/ftgzip.h b/modules/freetype2/include/freetype/ftgzip.h
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+++ b/modules/freetype2/include/freetype/ftgzip.h
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+/****************************************************************************
+ *
+ * ftgzip.h
+ *
+ *   Gzip-compressed stream support.
+ *
+ * Copyright (C) 2002-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * This file is part of the FreeType project, and may only be used,
+ * modified, and distributed under the terms of the FreeType project
+ * license, LICENSE.TXT.  By continuing to use, modify, or distribute
+ * this file you indicate that you have read the license and
+ * understand and accept it fully.
+ *
+ */
+
+
+#ifndef FTGZIP_H_
+#define FTGZIP_H_
+
+#include <freetype/freetype.h>
+
+#ifdef FREETYPE_H
+#error "freetype.h of FreeType 1 has been loaded!"
+#error "Please fix the directory search order for header files"
+#error "so that freetype.h of FreeType 2 is found first."
+#endif
+
+
+FT_BEGIN_HEADER
+
+  /**************************************************************************
+   *
+   * @section:
+   *   gzip
+   *
+   * @title:
+   *   GZIP Streams
+   *
+   * @abstract:
+   *   Using gzip-compressed font files.
+   *
+   * @description:
+   *   In certain builds of the library, gzip compression recognition is
+   *   automatically handled when calling @FT_New_Face or @FT_Open_Face.
+   *   This means that if no font driver is capable of handling the raw
+   *   compressed file, the library will try to open a gzipped stream from it
+   *   and re-open the face with it.
+   *
+   *   The stream implementation is very basic and resets the decompression
+   *   process each time seeking backwards is needed within the stream,
+   *   which significantly undermines the performance.
+   *
+   *   This section contains the declaration of Gzip-specific functions.
+   *
+   */
+
+
+  /**************************************************************************
+   *
+   * @function:
+   *   FT_Stream_OpenGzip
+   *
+   * @description:
+   *   Open a new stream to parse gzip-compressed font files.  This is mainly
+   *   used to support the compressed `*.pcf.gz` fonts that come with
+   *   XFree86.
+   *
+   * @input:
+   *   stream ::
+   *     The target embedding stream.
+   *
+   *   source ::
+   *     The source stream.
+   *
+   * @return:
+   *   FreeType error code.  0~means success.
+   *
+   * @note:
+   *   The source stream must be opened _before_ calling this function.
+   *
+   *   Calling the internal function `FT_Stream_Close` on the new stream will
+   *   **not** call `FT_Stream_Close` on the source stream.  None of the
+   *   stream objects will be released to the heap.
+   *
+   *   This function may return `FT_Err_Unimplemented_Feature` if your build
+   *   of FreeType was not compiled with zlib support.
+   */
+  FT_EXPORT( FT_Error )
+  FT_Stream_OpenGzip( FT_Stream  stream,
+                      FT_Stream  source );
+
+
+  /**************************************************************************
+   *
+   * @function:
+   *   FT_Gzip_Uncompress
+   *
+   * @description:
+   *   Decompress a zipped input buffer into an output buffer.  This function
+   *   is modeled after zlib's `uncompress` function.
+   *
+   * @input:
+   *   memory ::
+   *     A FreeType memory handle.
+   *
+   *   input ::
+   *     The input buffer.
+   *
+   *   input_len ::
+   *     The length of the input buffer.
+   *
+   * @output:
+   *   output ::
+   *     The output buffer.
+   *
+   * @inout:
+   *   output_len ::
+   *     Before calling the function, this is the total size of the output
+   *     buffer, which must be large enough to hold the entire uncompressed
+   *     data (so the size of the uncompressed data must be known in
+   *     advance).  After calling the function, `output_len` is the size of
+   *     the used data in `output`.
+   *
+   * @return:
+   *   FreeType error code.  0~means success.
+   *
+   * @note:
+   *   This function may return `FT_Err_Unimplemented_Feature` if your build
+   *   of FreeType was not compiled with zlib support.
+   *
+   * @since:
+   *   2.5.1
+   */
+  FT_EXPORT( FT_Error )
+  FT_Gzip_Uncompress( FT_Memory       memory,
+                      FT_Byte*        output,
+                      FT_ULong*       output_len,
+                      const FT_Byte*  input,
+                      FT_ULong        input_len );
+
+  /* */
+
+
+FT_END_HEADER
+
+#endif /* FTGZIP_H_ */
+
+
+/* END */