diff --git a/emulators/flycast/Makefile b/emulators/flycast/Makefile
index 2366f019499b..770d580c03ca 100644
--- a/emulators/flycast/Makefile
+++ b/emulators/flycast/Makefile
@@ -1,67 +1,67 @@
 PORTNAME=	flycast
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.5
-PORTREVISION=	4
+PORTREVISION=	5
 CATEGORIES=	emulators
 
 MAINTAINER=	bsdcode@disroot.org
 COMMENT=	Multi-platform Sega Dreamcast emulator
 WWW=		https://github.com/flyinghead/flycast
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	asio>0:net/asio
 LIB_DEPENDS=	libchdr.so:devel/libchdr \
 		libcurl.so:ftp/curl \
 		libminiupnpc.so:net/miniupnpc \
 		libzip.so:archivers/libzip
 
 USES=		cmake compiler:c++20-lang pkgconfig sdl
 USE_GITHUB=	yes
 GH_ACCOUNT=	flyinghead
 GH_TUPLE=	vinniefalco:LuaBridge:5d21e35633a1f87ed08af115b07d3386096f792b:LuaBridge/core/deps/luabridge \
 		GPUOpen-LibrariesAndSDKs:VulkanMemoryAllocator:6eb62e1515072827db992c2befd80b71b2d04329:VulkanMemoryAllocator/core/deps/VulkanMemoryAllocator \
 		RetroAchievements:rcheevos:563230b1c249774b4852c944dc7cdcb952c9e8e8:rcheevos/core/deps/rcheevos
 USE_SDL=	sdl2
 
 CMAKE_ON=	USE_HOST_LIBCHDR
 
 OPTIONS_DEFINE=		DOCS LUA OPENMP VULKAN
 OPTIONS_DEFAULT=	ALSA AO LUA OPENMP OSS VULKAN
 OPTIONS_GROUP=		AUDIO
 OPTIONS_GROUP_AUDIO=	ALSA AO OSS PULSEAUDIO
 
 # building with lua support fails on i386, see also
 # https://github.com/vinniefalco/LuaBridge/issues/302
 OPTIONS_EXCLUDE_i386=	LUA
 
 VULKAN_DESC=	Build with Vulkan support
 
 ALSA_LIB_DEPENDS=	libasound.so:audio/alsa-lib
 ALSA_CMAKE_BOOL=	USE_ALSA
 
 AO_LIB_DEPENDS=		libao.so:audio/libao
 AO_CMAKE_BOOL=		USE_LIBAO
 
 LUA_USES=		lua:52+
 LUA_CMAKE_BOOL=		USE_LUA
 
 OPENMP_CMAKE_BOOL=	USE_OPENMP
 
 OSS_CMAKE_BOOL=		USE_OSS
 
 PULSEAUDIO_LIB_DEPENDS=	libpulse.so:audio/pulseaudio
 PULSEAUDIO_CMAKE_BOOL=	USE_PULSEAUDIO
 
 VULKAN_BUILD_DEPENDS=	glslang>0:graphics/glslang \
 			vulkan-headers>0:graphics/vulkan-headers
 VULKAN_CMAKE_BOOL=	USE_HOST_GLSLANG \
 			USE_VULKAN
 
 post-install-DOCS-on:
 	${MKDIR} ${STAGEDIR}${DOCSDIR}
 	(cd ${WRKSRC}/docs && \
 		${COPYTREE_SHARE} . ${STAGEDIR}${DOCSDIR})
 
 .include <bsd.port.mk>
diff --git a/emulators/flycast/files/patch-core_network_dcnet.cpp b/emulators/flycast/files/patch-core_network_dcnet.cpp
new file mode 100644
index 000000000000..cf7c76d929cf
--- /dev/null
+++ b/emulators/flycast/files/patch-core_network_dcnet.cpp
@@ -0,0 +1,38 @@
+--- core/network/dcnet.cpp.orig	2025-07-18 15:30:48 UTC
++++ core/network/dcnet.cpp
+@@ -222,7 +222,7 @@ class EthSocket (private)
+ 	}
+ 
+ private:
+-	using iterator = asio::buffers_iterator<asio::const_buffers_1>;
++	using iterator = asio::buffers_iterator<asio::const_buffer>;
+ 
+ 	std::pair<iterator, bool>
+ 	static packetMatcher(iterator begin, iterator end)
+@@ -502,7 +502,7 @@ class AccessPointFinder (private)
+ 	{
+ 		std::error_code e;
+ 		socket.close(e);
+-		timer.cancel(e);
++		timer.cancel();
+ 		if (ec) {
+ 			handler(ec, {}, {});
+ 		}
+@@ -584,7 +584,7 @@ class DCNetThread (public)
+ 	{
+ 		if (io_context == nullptr || pppSocket == nullptr)
+ 			return;
+-		io_context->post([this, v]() {
++		asio::post([this, v]() {
+ 			pppSocket->send(v);
+ 		});
+ 	}
+@@ -593,7 +593,7 @@ class DCNetThread (public)
+ 		if (io_context != nullptr && ethSocket != nullptr)
+ 		{
+ 			std::vector<u8> vbuf(frame, frame + len);
+-			io_context->post([this, vbuf]() {
++			asio::post([this, vbuf]() {
+ 				ethSocket->send(vbuf.data(), vbuf.size());
+ 			});
+ 		}