diff --git a/graphics/viewnior/exiv2-0.28.patch b/graphics/viewnior/exiv2-0.28.patch
new file mode 100644
index 0000000000..73d5f44493
--- /dev/null
+++ b/graphics/viewnior/exiv2-0.28.patch
@@ -0,0 +1,145 @@
+From b6bb81a1b46e911d15bbf9a730972523de177705 Mon Sep 17 00:00:00 2001
+From: tastytea <tastytea@tastytea.de>
+Date: Tue, 16 May 2023 10:54:40 +0200
+Subject: [PATCH 1/2] change exiv2 AutoPtr to unique_ptr
+
+exiv2-0.28.0 removed Exiv2::Image::AutoPtr and added
+Exiv2::Image::UniquePtr instead. since it's a typedef for
+std::unique_ptr<Image>, i'm using that directly instead of adding a
+condition on the exiv2 version.
+---
+ src/uni-exiv2.cpp | 21 +++++++++++----------
+ 1 file changed, 11 insertions(+), 10 deletions(-)
+
+diff --git a/src/uni-exiv2.cpp b/src/uni-exiv2.cpp
+index 0d14b9f..77064c2 100644
+--- a/src/uni-exiv2.cpp
++++ b/src/uni-exiv2.cpp
+@@ -22,12 +22,13 @@
+ 
+ #include <exiv2/exiv2.hpp>
+ #include <iostream>
++#include <memory>
+ 
+ #include "uni-exiv2.hpp"
+ 
+ #define ARRAY_SIZE(array) (sizeof array/sizeof(array[0]))
+ 
+-static Exiv2::Image::AutoPtr cached_image;
++static std::unique_ptr<Exiv2::Image> cached_image;
+ 
+ extern "C"
+ void
+@@ -35,8 +36,8 @@ uni_read_exiv2_map(const char *uri, void (*callback)(const char*, const char*, v
+ {
+     Exiv2::LogMsg::setLevel(Exiv2::LogMsg::mute);
+     try {
+-        Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(uri);
+-        if ( image.get() == 0 ) {
++        std::unique_ptr<Exiv2::Image> image = Exiv2::ImageFactory::open(uri);
++        if (image == nullptr) {
+             return;
+         }
+ 
+@@ -91,14 +92,14 @@ uni_read_exiv2_to_cache(const char *uri)
+ {
+     Exiv2::LogMsg::setLevel(Exiv2::LogMsg::mute);
+ 
+-    if ( cached_image.get() != NULL ) {
++    if (cached_image != nullptr) {
+         cached_image->clearMetadata();
+-        cached_image.reset(NULL);
++        cached_image.reset(nullptr);
+     }
+ 
+     try {
+         cached_image = Exiv2::ImageFactory::open(uri);
+-        if ( cached_image.get() == 0 ) {
++        if (cached_image == nullptr) {
+             return 1;
+         }
+ 
+@@ -116,13 +117,13 @@ uni_write_exiv2_from_cache(const char *uri)
+ {
+     Exiv2::LogMsg::setLevel(Exiv2::LogMsg::mute);
+ 
+-    if ( cached_image.get() == NULL ) {
++    if (cached_image == nullptr) {
+         return 1;
+     }
+ 
+     try {
+-        Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(uri);
+-        if ( image.get() == 0 ) {
++        std::unique_ptr<Exiv2::Image> image = Exiv2::ImageFactory::open(uri);
++        if (image == nullptr) {
+             return 2;
+         }
+ 
+@@ -130,7 +131,7 @@ uni_write_exiv2_from_cache(const char *uri)
+         image->writeMetadata();
+ 
+         cached_image->clearMetadata();
+-        cached_image.reset(NULL);
++        cached_image.reset(nullptr);
+ 
+         return 0;
+     } catch (Exiv2::AnyError& e) {
+
+From 47d0b98cb46526aa8aa035bebcabc14a11fa57ee Mon Sep 17 00:00:00 2001
+From: tastytea <tastytea@tastytea.de>
+Date: Tue, 16 May 2023 11:17:00 +0200
+Subject: [PATCH 2/2] add support for exiv-0.28.0 errors
+
+exiv2-0.28.0 changed Exiv2::AnyError to Exiv2::Error.
+---
+ src/uni-exiv2.cpp | 15 ++++++++++++---
+ 1 file changed, 12 insertions(+), 3 deletions(-)
+
+diff --git a/src/uni-exiv2.cpp b/src/uni-exiv2.cpp
+index 77064c2..567a50f 100644
+--- a/src/uni-exiv2.cpp
++++ b/src/uni-exiv2.cpp
+@@ -28,6 +28,15 @@
+ 
+ #define ARRAY_SIZE(array) (sizeof array/sizeof(array[0]))
+ 
++#define EXIV_ERROR Exiv2::AnyError
++#ifdef EXIV2_VERSION
++    #ifdef EXIV2_TEST_VERSION
++        #if EXIV2_TEST_VERSION(0,28,0)
++            #define EXIV_ERROR Exiv2::Error
++        #endif
++    #endif
++#endif
++
+ static std::unique_ptr<Exiv2::Image> cached_image;
+ 
+ extern "C"
+@@ -81,7 +90,7 @@ uni_read_exiv2_map(const char *uri, void (*callback)(const char*, const char*, v
+                 }
+             }
+         }
+-    } catch (Exiv2::AnyError& e) {
++    } catch (EXIV_ERROR& e) {
+         std::cerr << "Exiv2: '" << e << "'\n";
+     }
+ }
+@@ -104,7 +113,7 @@ uni_read_exiv2_to_cache(const char *uri)
+         }
+ 
+         cached_image->readMetadata();
+-    } catch (Exiv2::AnyError& e) {
++    } catch (EXIV_ERROR& e) {
+         std::cerr << "Exiv2: '" << e << "'\n";
+     }
+ 
+@@ -134,7 +143,7 @@ uni_write_exiv2_from_cache(const char *uri)
+         cached_image.reset(nullptr);
+ 
+         return 0;
+-    } catch (Exiv2::AnyError& e) {
++    } catch (EXIV_ERROR& e) {
+         std::cerr << "Exiv2: '" << e << "'\n";
+     }
+ 
diff --git a/graphics/viewnior/viewnior.SlackBuild b/graphics/viewnior/viewnior.SlackBuild
index b643658bc9..63a9fc8669 100644
--- a/graphics/viewnior/viewnior.SlackBuild
+++ b/graphics/viewnior/viewnior.SlackBuild
@@ -4,7 +4,7 @@
 #
 # Written by Šime Ramov <email removed>
 # Copyright 2016-2018  Edinaldo P. Silva, Rio de Janeiro, Brazil.
-# Copyright 2020 B. Watson
+# Copyright 2020-2023 B. Watson
 # All rights reserved.
 #
 # Redistribution and use of this script, with or without modification, is
@@ -24,6 +24,9 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# 20231030 bkw: add patch for -current. doesn't break 15.0.
+# Not updating BUILD for this (it's still 1).
+
 # 20220610 bkw: update for v1.8.
 
 # 20200304 bkw:
@@ -87,6 +90,12 @@ chown -R root:root .
 find -L . -type d -a -exec chmod 755 {} + -o \
           -type f -a -exec chmod 644 {} +
 
+# 20231030 bkw: this patch comes from arch (their extra/, not AUR).
+# only apply it if needed: slackware 15.0 has exiv2-0.27.5 and doesn't
+# need it.
+pkg-config exiv2 --atleast-version=0.28 && \
+  patch -p1 < $CWD/exiv2-0.28.patch
+
 sed -i "s,It's,Its," man/$PRGNAM.1
 
 CFLAGS="$SLKCFLAGS" \