diff --git a/games/gzdoom/gcc13-missing-includes.diff b/games/gzdoom/gcc13-missing-includes.diff
new file mode 100644
index 0000000000..4083e06f80
--- /dev/null
+++ b/games/gzdoom/gcc13-missing-includes.diff
@@ -0,0 +1,60 @@
+From ee8c12eac62349f4524229370da20915624485ef Mon Sep 17 00:00:00 2001
+From: Jan Engelhardt <jengelh@inai.de>
+Date: Thu, 30 Mar 2023 23:41:22 +0200
+Subject: [PATCH] build: resolve missing includes under gcc-13
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+$ make
+...
+~/gzdoom/libraries/ZVulkan/src/vulkanbuilders.cpp: In member function ‘std::unique_ptr<VulkanShader> ShaderBuilder::Create(const char*, VulkanDevice*)’:
+~/gzdoom/libraries/ZVulkan/src/vulkanbuilders.cpp:168:28: error: ‘runtime_error’ is not a member of ‘std’
+~/gzdoom/libraries/ZVulkan/include/zvulkan/vk_mem_alloc/vk_mem_alloc.h: In function ‘void VmaUint32ToStr(char*, size_t, uint32_t)’:
+~/gzdoom/libraries/ZVulkan/include/zvulkan/vk_mem_alloc/vk_mem_alloc.h:2410:9: error: ‘snprint ’ was not declared in this scope
+---
+ src/common/rendering/vulkan/system/vk_builders.cpp              | 1 +
+ src/common/rendering/vulkan/system/vk_swapchain.cpp             | 1 +
+ .../rendering/vulkan/thirdparty/vk_mem_alloc/vk_mem_alloc.h     | 2 ++
+ 3 files changed, 4 insertions(+)
+
+diff --git a/src/common/rendering/vulkan/system/vk_builders.cpp b/src/common/rendering/vulkan/system/vk_builders.cpp
+index aff0de50a9..b8d4a13de9 100644
+--- a/src/common/rendering/vulkan/system/vk_builders.cpp
++++ b/src/common/rendering/vulkan/system/vk_builders.cpp
+@@ -20,6 +20,7 @@
+ **
+ */
+ 
++#include <stdexcept>
+ #include "vk_builders.h"
+ #include "engineerrors.h"
+ #include "renderstyle.h"
+diff --git a/src/common/rendering/vulkan/system/vk_swapchain.cpp b/src/common/rendering/vulkan/system/vk_swapchain.cpp
+index f44139b1f5..e89a6bd823 100644
+--- a/src/common/rendering/vulkan/system/vk_swapchain.cpp
++++ b/src/common/rendering/vulkan/system/vk_swapchain.cpp
+@@ -20,6 +20,7 @@
+ **
+ */
+ 
++#include <stdexcept>
+ #include "vk_swapchain.h"
+ #include "vk_objects.h"
+ #include "c_cvars.h"
+diff --git a/src/common/rendering/vulkan/thirdparty/vk_mem_alloc/vk_mem_alloc.h b/src/common/rendering/vulkan/thirdparty/vk_mem_alloc/vk_mem_alloc.h
+index fd4472286b..db0b94f4e8 100644
+--- a/src/common/rendering/vulkan/thirdparty/vk_mem_alloc/vk_mem_alloc.h
++++ b/src/common/rendering/vulkan/thirdparty/vk_mem_alloc/vk_mem_alloc.h
+@@ -104,6 +104,8 @@ Documentation of all members: vk_mem_alloc.h
+ - [Source repository on GitHub](https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator)
+ */
+ 
++#include <stdio.h>
++
+ #ifdef __cplusplus
+ extern "C" {
+ #endif
+-- 
+2.40.1
+
diff --git a/games/gzdoom/gzdoom.SlackBuild b/games/gzdoom/gzdoom.SlackBuild
index 15179ffb82..0a599804e2 100644
--- a/games/gzdoom/gzdoom.SlackBuild
+++ b/games/gzdoom/gzdoom.SlackBuild
@@ -6,10 +6,10 @@
 
 # Licensed under the WTFPL. See http://www.wtfpl.net/txt/copying/ for details.
 
+# 20230810 bkw: add patch to fix build on -current (does no harm on 15.0).
 # 20230109 bkw: Updated for 4.10.0. Many thanks to fourtysixandtwo for
 # testing this on more capable hardware than I have, and for finding
 # the "-glversion 3.3" argument.
-
 # 20201115 bkw: Add missing fix_zipdir.diff. Dammit.
 # 20201107 bkw: Updated for 4.5.0.
 # 20201027 bkw:
@@ -88,6 +88,10 @@ chown -R root:root .
 find -L .  -perm /111 -a \! -perm 755 -a -exec chmod 755 {} \+ -o \
         \! -perm /111 -a \! -perm 644 -a -exec chmod 644 {} \+
 
+# 20230810 bkw: patch for gcc 13 (Slackware -current), from AUR, by
+# way of biker_rat on LQ, delivered C/O ponce.
+patch -p1 < $CWD/gcc13-missing-includes.diff
+
 # 20201027 bkw: fix the '<unknown version>' in the window title. This
 # used to be done in an uglier way (with a patch that occasionally broke
 # when applied against new gzdooms).