diff --git a/third_party/BUILD.gn b/third_party/BUILD.gn
index 601b051..09081f3 100644
--- a/third_party/BUILD.gn
+++ b/third_party/BUILD.gn
@@ -551,7 +551,6 @@
       "libtiff/tif_version.c",
       "libtiff/tif_warning.c",
       "libtiff/tif_write.c",
-      "libtiff/tif_zip.c",
       "libtiff/tiffiop.h",
       "libtiff/tiffvers.h",
     ]
diff --git a/third_party/libtiff/tif_zip.c b/third_party/libtiff/tif_zip.c
deleted file mode 100644
index c750773..0000000
--- a/third_party/libtiff/tif_zip.c
+++ /dev/null
@@ -1,456 +0,0 @@
-/*
- * Copyright (c) 1995-1997 Sam Leffler
- * Copyright (c) 1995-1997 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and 
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- * 
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
- * 
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
- * OF THIS SOFTWARE.
- */
-
-#include "tiffiop.h"
-#ifdef ZIP_SUPPORT
-/*
- * TIFF Library.
- *
- * ZIP (aka Deflate) Compression Support
- *
- * This file is simply an interface to the zlib library written by
- * Jean-loup Gailly and Mark Adler.  You must use version 1.0 or later
- * of the library: this code assumes the 1.0 API and also depends on
- * the ability to write the zlib header multiple times (one per strip)
- * which was not possible with versions prior to 0.95.  Note also that
- * older versions of this codec avoided this bug by suppressing the header
- * entirely.  This means that files written with the old library cannot
- * be read; they should be converted to a different compression scheme
- * and then reconverted.
- *
- * The data format used by the zlib library is described in the files
- * zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available in the
- * directory ftp://ftp.uu.net/pub/archiving/zip/doc.  The library was
- * last found at ftp://ftp.uu.net/pub/archiving/zip/zlib/zlib-0.99.tar.gz.
- */
-#include "tif_predict.h"
-#include "zlib.h"
-
-#include <stdio.h>
-
-/*
- * Sigh, ZLIB_VERSION is defined as a string so there's no
- * way to do a proper check here.  Instead we guess based
- * on the presence of #defines that were added between the
- * 0.95 and 1.0 distributions.
- */
-#if !defined(Z_NO_COMPRESSION) || !defined(Z_DEFLATED)
-#error "Antiquated ZLIB software; you must use version 1.0 or later"
-#endif
-
-#define SAFE_MSG(sp)   ((sp)->stream.msg == NULL ? "" : (sp)->stream.msg)
-
-/*
- * State block for each open TIFF
- * file using ZIP compression/decompression.
- */
-typedef struct {
-	TIFFPredictorState predict;
-        z_stream        stream;
-	int             zipquality;            /* compression level */
-	int             state;                 /* state flags */
-#define ZSTATE_INIT_DECODE 0x01
-#define ZSTATE_INIT_ENCODE 0x02
-
-	TIFFVGetMethod  vgetparent;            /* super-class method */
-	TIFFVSetMethod  vsetparent;            /* super-class method */
-} ZIPState;
-
-#define ZState(tif)             ((ZIPState*) (tif)->tif_data)
-#define DecoderState(tif)       ZState(tif)
-#define EncoderState(tif)       ZState(tif)
-
-static int ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);
-static int ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s);
-
-static int
-ZIPFixupTags(TIFF* tif)
-{
-	(void) tif;
-	return (1);
-}
-
-static int
-ZIPSetupDecode(TIFF* tif)
-{
-	static const char module[] = "ZIPSetupDecode";
-	ZIPState* sp = DecoderState(tif);
-
-	assert(sp != NULL);
-        
-        /* if we were last encoding, terminate this mode */
-	if (sp->state & ZSTATE_INIT_ENCODE) {
-	    deflateEnd(&sp->stream);
-	    sp->state = 0;
-	}
-
-	/* This function can possibly be called several times by */
-	/* PredictorSetupDecode() if this function succeeds but */
-	/* PredictorSetup() fails */
-	if ((sp->state & ZSTATE_INIT_DECODE) == 0 &&
-	    inflateInit(&sp->stream) != Z_OK) {
-		TIFFErrorExt(tif->tif_clientdata, module, "%s", SAFE_MSG(sp));
-		return (0);
-	} else {
-		sp->state |= ZSTATE_INIT_DECODE;
-		return (1);
-	}
-}
-
-/*
- * Setup state for decoding a strip.
- */
-static int
-ZIPPreDecode(TIFF* tif, uint16 s)
-{
-	ZIPState* sp = DecoderState(tif);
-
-	(void) s;
-	assert(sp != NULL);
-
-	if( (sp->state & ZSTATE_INIT_DECODE) == 0 )
-            tif->tif_setupdecode( tif );
-
-	sp->stream.next_in = tif->tif_rawdata;
-	assert(sizeof(sp->stream.avail_in)==4);  /* if this assert gets raised,
-	    we need to simplify this code to reflect a ZLib that is likely updated
-	    to deal with 8byte memory sizes, though this code will respond
-	    appropriately even before we simplify it */
-	sp->stream.avail_in = (uint64)tif->tif_rawcc < 0xFFFFFFFFU ? (uInt) tif->tif_rawcc : 0xFFFFFFFFU;
-	return (inflateReset(&sp->stream) == Z_OK);
-}
-
-static int
-ZIPDecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
-{
-	static const char module[] = "ZIPDecode";
-	ZIPState* sp = DecoderState(tif);
-
-	(void) s;
-	assert(sp != NULL);
-	assert(sp->state == ZSTATE_INIT_DECODE);
-
-        sp->stream.next_in = tif->tif_rawcp;
-        
-	sp->stream.next_out = op;
-	assert(sizeof(sp->stream.avail_out)==4);  /* if this assert gets raised,
-	    we need to simplify this code to reflect a ZLib that is likely updated
-	    to deal with 8byte memory sizes, though this code will respond
-	    appropriately even before we simplify it */
-	do {
-                int state;
-                uInt avail_in_before = (uint64)tif->tif_rawcc <= 0xFFFFFFFFU ? (uInt)tif->tif_rawcc : 0xFFFFFFFFU;
-                uInt avail_out_before = (uint64)occ < 0xFFFFFFFFU ? (uInt) occ : 0xFFFFFFFFU;
-                sp->stream.avail_in = avail_in_before;
-                sp->stream.avail_out = avail_out_before;
-		state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
-		tif->tif_rawcc -= (avail_in_before - sp->stream.avail_in);
-                occ -= (avail_out_before - sp->stream.avail_out);
-		if (state == Z_STREAM_END)
-			break;
-		if (state == Z_DATA_ERROR) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-			    "Decoding error at scanline %lu, %s",
-			     (unsigned long) tif->tif_row, SAFE_MSG(sp));
-			return (0);
-		}
-		if (state != Z_OK) {
-			TIFFErrorExt(tif->tif_clientdata, module, 
-				     "ZLib error: %s", SAFE_MSG(sp));
-			return (0);
-		}
-	} while (occ > 0);
-	if (occ != 0) {
-		TIFFErrorExt(tif->tif_clientdata, module,
-		    "Not enough data at scanline %lu (short " TIFF_UINT64_FORMAT " bytes)",
-		    (unsigned long) tif->tif_row, (TIFF_UINT64_T) occ);
-		return (0);
-	}
-
-        tif->tif_rawcp = sp->stream.next_in;
-
-	return (1);
-}
-
-static int
-ZIPSetupEncode(TIFF* tif)
-{
-	static const char module[] = "ZIPSetupEncode";
-	ZIPState* sp = EncoderState(tif);
-
-	assert(sp != NULL);
-	if (sp->state & ZSTATE_INIT_DECODE) {
-		inflateEnd(&sp->stream);
-		sp->state = 0;
-	}
-
-	if (deflateInit(&sp->stream, sp->zipquality) != Z_OK) {
-		TIFFErrorExt(tif->tif_clientdata, module, "%s", SAFE_MSG(sp));
-		return (0);
-	} else {
-		sp->state |= ZSTATE_INIT_ENCODE;
-		return (1);
-	}
-}
-
-/*
- * Reset encoding state at the start of a strip.
- */
-static int
-ZIPPreEncode(TIFF* tif, uint16 s)
-{
-	ZIPState *sp = EncoderState(tif);
-
-	(void) s;
-	assert(sp != NULL);
-	if( sp->state != ZSTATE_INIT_ENCODE )
-            tif->tif_setupencode( tif );
-
-	sp->stream.next_out = tif->tif_rawdata;
-	assert(sizeof(sp->stream.avail_out)==4);  /* if this assert gets raised,
-	    we need to simplify this code to reflect a ZLib that is likely updated
-	    to deal with 8byte memory sizes, though this code will respond
-	    appropriately even before we simplify it */
-	sp->stream.avail_out = (uint64)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU;
-	return (deflateReset(&sp->stream) == Z_OK);
-}
-
-/*
- * Encode a chunk of pixels.
- */
-static int
-ZIPEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
-{
-	static const char module[] = "ZIPEncode";
-	ZIPState *sp = EncoderState(tif);
-
-	assert(sp != NULL);
-	assert(sp->state == ZSTATE_INIT_ENCODE);
-
-	(void) s;
-	sp->stream.next_in = bp;
-	assert(sizeof(sp->stream.avail_in)==4);  /* if this assert gets raised,
-	    we need to simplify this code to reflect a ZLib that is likely updated
-	    to deal with 8byte memory sizes, though this code will respond
-	    appropriately even before we simplify it */
-	do {
-                uInt avail_in_before = (uint64)cc <= 0xFFFFFFFFU ? (uInt)cc : 0xFFFFFFFFU;
-                sp->stream.avail_in = avail_in_before;
-		if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) {
-			TIFFErrorExt(tif->tif_clientdata, module, 
-				     "Encoder error: %s",
-				     SAFE_MSG(sp));
-			return (0);
-		}
-		if (sp->stream.avail_out == 0) {
-			tif->tif_rawcc = tif->tif_rawdatasize;
-			TIFFFlushData1(tif);
-			sp->stream.next_out = tif->tif_rawdata;
-			sp->stream.avail_out = (uint64)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU;
-		}
-		cc -= (avail_in_before - sp->stream.avail_in);
-	} while (cc > 0);
-	return (1);
-}
-
-/*
- * Finish off an encoded strip by flushing the last
- * string and tacking on an End Of Information code.
- */
-static int
-ZIPPostEncode(TIFF* tif)
-{
-	static const char module[] = "ZIPPostEncode";
-	ZIPState *sp = EncoderState(tif);
-	int state;
-
-	sp->stream.avail_in = 0;
-	do {
-		state = deflate(&sp->stream, Z_FINISH);
-		switch (state) {
-		case Z_STREAM_END:
-		case Z_OK:
-			if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize)
-			{
-				tif->tif_rawcc =  tif->tif_rawdatasize - sp->stream.avail_out;
-				TIFFFlushData1(tif);
-				sp->stream.next_out = tif->tif_rawdata;
-				sp->stream.avail_out = (uint64)tif->tif_rawdatasize <= 0xFFFFFFFFU ? (uInt)tif->tif_rawdatasize : 0xFFFFFFFFU;
-			}
-			break;
-		default:
-			TIFFErrorExt(tif->tif_clientdata, module, 
-				     "ZLib error: %s", SAFE_MSG(sp));
-			return (0);
-		}
-	} while (state != Z_STREAM_END);
-	return (1);
-}
-
-static void
-ZIPCleanup(TIFF* tif)
-{
-	ZIPState* sp = ZState(tif);
-
-	assert(sp != 0);
-
-	(void)TIFFPredictorCleanup(tif);
-
-	tif->tif_tagmethods.vgetfield = sp->vgetparent;
-	tif->tif_tagmethods.vsetfield = sp->vsetparent;
-
-	if (sp->state & ZSTATE_INIT_ENCODE) {
-		deflateEnd(&sp->stream);
-		sp->state = 0;
-	} else if( sp->state & ZSTATE_INIT_DECODE) {
-		inflateEnd(&sp->stream);
-		sp->state = 0;
-	}
-	_TIFFfree(sp);
-	tif->tif_data = NULL;
-
-	_TIFFSetDefaultCompressionState(tif);
-}
-
-static int
-ZIPVSetField(TIFF* tif, uint32 tag, va_list ap)
-{
-	static const char module[] = "ZIPVSetField";
-	ZIPState* sp = ZState(tif);
-
-	switch (tag) {
-	case TIFFTAG_ZIPQUALITY:
-		sp->zipquality = (int) va_arg(ap, int);
-		if ( sp->state&ZSTATE_INIT_ENCODE ) {
-			if (deflateParams(&sp->stream,
-			    sp->zipquality, Z_DEFAULT_STRATEGY) != Z_OK) {
-				TIFFErrorExt(tif->tif_clientdata, module, "ZLib error: %s",
-					     SAFE_MSG(sp));
-				return (0);
-			}
-		}
-		return (1);
-	default:
-		return (*sp->vsetparent)(tif, tag, ap);
-	}
-	/*NOTREACHED*/
-}
-
-static int
-ZIPVGetField(TIFF* tif, uint32 tag, va_list ap)
-{
-	ZIPState* sp = ZState(tif);
-
-	switch (tag) {
-	case TIFFTAG_ZIPQUALITY:
-		*va_arg(ap, int*) = sp->zipquality;
-		break;
-	default:
-		return (*sp->vgetparent)(tif, tag, ap);
-	}
-	return (1);
-}
-
-static const TIFFField zipFields[] = {
-    { TIFFTAG_ZIPQUALITY, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "", NULL },
-};
-
-int
-TIFFInitZIP(TIFF* tif, int scheme)
-{
-	static const char module[] = "TIFFInitZIP";
-	ZIPState* sp;
-
-	assert( (scheme == COMPRESSION_DEFLATE)
-		|| (scheme == COMPRESSION_ADOBE_DEFLATE));
-
-	/*
-	 * Merge codec-specific tag information.
-	 */
-	if (!_TIFFMergeFields(tif, zipFields, TIFFArrayCount(zipFields))) {
-		TIFFErrorExt(tif->tif_clientdata, module,
-			     "Merging Deflate codec-specific tags failed");
-		return 0;
-	}
-
-	/*
-	 * Allocate state block so tag methods have storage to record values.
-	 */
-	tif->tif_data = (uint8*) _TIFFmalloc(sizeof (ZIPState));
-	if (tif->tif_data == NULL)
-		goto bad;
-	sp = ZState(tif);
-	sp->stream.zalloc = NULL;
-	sp->stream.zfree = NULL;
-	sp->stream.opaque = NULL;
-	sp->stream.data_type = Z_BINARY;
-
-	/*
-	 * Override parent get/set field methods.
-	 */
-	sp->vgetparent = tif->tif_tagmethods.vgetfield;
-	tif->tif_tagmethods.vgetfield = ZIPVGetField; /* hook for codec tags */
-	sp->vsetparent = tif->tif_tagmethods.vsetfield;
-	tif->tif_tagmethods.vsetfield = ZIPVSetField; /* hook for codec tags */
-
-	/* Default values for codec-specific fields */
-	sp->zipquality = Z_DEFAULT_COMPRESSION;	/* default comp. level */
-	sp->state = 0;
-
-	/*
-	 * Install codec methods.
-	 */
-	tif->tif_fixuptags = ZIPFixupTags; 
-	tif->tif_setupdecode = ZIPSetupDecode;
-	tif->tif_predecode = ZIPPreDecode;
-	tif->tif_decoderow = ZIPDecode;
-	tif->tif_decodestrip = ZIPDecode;
-	tif->tif_decodetile = ZIPDecode;  
-	tif->tif_setupencode = ZIPSetupEncode;
-	tif->tif_preencode = ZIPPreEncode;
-	tif->tif_postencode = ZIPPostEncode;
-	tif->tif_encoderow = ZIPEncode;
-	tif->tif_encodestrip = ZIPEncode;
-	tif->tif_encodetile = ZIPEncode;
-	tif->tif_cleanup = ZIPCleanup;
-	/*
-	 * Setup predictor setup.
-	 */
-	(void) TIFFPredictorInit(tif);
-	return (1);
-bad:
-	TIFFErrorExt(tif->tif_clientdata, module,
-		     "No space for ZIP state block");
-	return (0);
-}
-#endif /* ZIP_SUPPORT */
-
-/* vim: set ts=8 sts=8 sw=8 noet: */
-/*
- * Local Variables:
- * mode: c
- * c-basic-offset: 8
- * fill-column: 78
- * End:
- */