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diff --git a/src/libOpenImageIO/exif.cpp b/src/libOpenImageIO/exif.cpp
index 10b75c21..0287d9c5 100644
--- a/src/libOpenImageIO/exif.cpp
+++ b/src/libOpenImageIO/exif.cpp
@@ -213,6 +213,9 @@ static const EXIF_tag_info exif_tag_table[] = {
+// libtiff > 4.1.0 defines these in tiff.h. For older libtiff, let's define
+// them ourselves.
+#ifndef GPSTAG_VERSIONID
enum GPSTag {
GPSTAG_VERSIONID = 0,
GPSTAG_LATITUDEREF = 1, GPSTAG_LATITUDE = 2,
@@ -237,6 +240,7 @@ enum GPSTag {
GPSTAG_DIFFERENTIAL = 30,
GPSTAG_HPOSITIONINGERROR = 31
};
+#endif
static const EXIF_tag_info gps_tag_table[] = {
{ GPSTAG_VERSIONID, "GPS:VersionID", TIFF_BYTE, 4 },
@@ -270,7 +274,7 @@ static const EXIF_tag_info gps_tag_table[] = {
{ GPSTAG_AREAINFORMATION, "GPS:AreaInformation", TIFF_UNDEFINED, 1 },
{ GPSTAG_DATESTAMP, "GPS:DateStamp", TIFF_ASCII, 0 },
{ GPSTAG_DIFFERENTIAL, "GPS:Differential", TIFF_SHORT, 1 },
- { GPSTAG_HPOSITIONINGERROR, "GPS:HPositioningError",TIFF_RATIONAL, 1 },
+ { GPSTAG_GPSHPOSITIONINGERROR, "GPS:HPositioningError",TIFF_RATIONAL, 1 },
{ -1, NULL } // signal end of table
};
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