diff --git c/emulators/mesen/Makefile i/emulators/mesen/Makefile
new file mode 100644
index 000000000000..0b41547e2757
--- /dev/null
+++ i/emulators/mesen/Makefile
@@ -0,0 +1,69 @@
+# $FreeBSD$
+
+PORTNAME=	mesen
+DISTVERSION=	0.9.5
+CATEGORIES=	emulators
+
+MAINTAINER=	greg@unrelenting.technology
+COMMENT=	Cross-platform Nintendo Entertainment System (NES/Famicom) emulator
+
+LICENSE=	GPLv3
+
+# ARM/MIPS only supported on Android
+ONLY_FOR_ARCHS=	amd64 i386
+
+LIB_DEPENDS=	libevdev.so:devel/libevdev
+
+USES=		compiler:c++14-lang gmake pkgconfig
+USE_GITHUB=	yes
+GH_ACCOUNT=	SourMesen
+GH_PROJECT=	Mesen
+USE_SDL=	sdl2
+MAKEFILE=	makefile
+MAKE_ARGS=	MESENPLATFORM=${MESEN_ARCH} LTO=true SYSTEM_LIBEVDEV=true FSLIB=-lc++experimental
+MESEN_ARCH=	${ARCH:S/amd64/x64/:S/i386/x86/}
+
+OPTIONS_MULTI=			FRONTENDS
+OPTIONS_MULTI_FRONTENDS=	MONO LIBRETRO
+OPTIONS_DEFAULT=		MONO LIBRETRO
+OPTIONS_SUB=			yes
+
+MONO_DESC=	Mono based GUI frontend
+LIBRETRO_DESC=	Libretro core
+
+MONO_ALL_TARGET=	ui
+MONO_BUILD_DEPENDS=	mono:lang/mono
+MONO_RUN_DEPENDS=	mono:lang/mono
+MONO_DESKTOP_ENTRIES=	"Mesen" "NES/Famicom Emulator" \
+			"mesen" "mesen" "emulator;Nintendo;NES;Famicom;" false
+
+LIBRETRO_ALL_TARGET=	libretro
+
+.include <bsd.port.options.mk>
+
+do-install:
+.if ${PORT_OPTIONS:MMONO}
+	${MKDIR} ${STAGEDIR}${PREFIX}/libexec/mesen
+	${MKDIR} ${STAGEDIR}${PREFIX}/share/icons/hicolor/64x64/apps/
+	${MKDIR} ${STAGEDIR}${PREFIX}/share/icons/hicolor/32x32/apps/
+	${MKDIR} ${STAGEDIR}${PREFIX}/share/icons/hicolor/16x16/apps/
+	${INSTALL_LIB} ${WRKSRC}/bin/${MESEN_ARCH}/Release/Dependencies/libMesenCore.${MESEN_ARCH}.dll \
+			${STAGEDIR}${PREFIX}/libexec/mesen/libMesenCore.dll
+	${INSTALL_PROGRAM} ${WRKSRC}/bin/${MESEN_ARCH}/Release/Mesen.exe \
+			${STAGEDIR}${PREFIX}/libexec/mesen/
+	${INSTALL_DATA} ${WRKSRC}/GUI.NET/Resources/MesenIcon.png \
+			${STAGEDIR}${PREFIX}/share/icons/hicolor/64x64/apps/mesen.png
+	${INSTALL_DATA} ${WRKSRC}/GUI.NET/Resources/MesenIconMedium.png \
+			${STAGEDIR}${PREFIX}/share/icons/hicolor/32x32/apps/mesen.png
+	${INSTALL_DATA} ${WRKSRC}/GUI.NET/Resources/MesenIconSmall.png \
+			${STAGEDIR}${PREFIX}/share/icons/hicolor/16x16/apps/mesen.png
+	${INSTALL_SCRIPT} ${FILESDIR}/launch.sh ${STAGEDIR}${PREFIX}/bin/mesen
+	${REINPLACE_CMD} 's|%%PREFIX%%|${PREFIX}|g' ${STAGEDIR}${PREFIX}/bin/mesen
+.endif
+.if ${PORT_OPTIONS:MLIBRETRO}
+	${MKDIR} ${STAGEDIR}${PREFIX}/lib/libretro
+	${INSTALL_LIB} ${WRKSRC}/bin/mesen_libretro.${MESEN_ARCH}.so \
+			${STAGEDIR}${PREFIX}/lib/libretro/mesen_libretro.so
+.endif
+
+.include <bsd.port.mk>
diff --git c/emulators/mesen/distinfo i/emulators/mesen/distinfo
new file mode 100644
index 000000000000..70cb6622efa2
--- /dev/null
+++ i/emulators/mesen/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1523121353
+SHA256 (SourMesen-Mesen-0.9.5_GH0.tar.gz) = e05a5cb5c38ea844353d1b2ef3c86630e925b7c198b410c952acc5f2c9e8afc0
+SIZE (SourMesen-Mesen-0.9.5_GH0.tar.gz) = 16896967
diff --git c/emulators/mesen/files/launch.sh i/emulators/mesen/files/launch.sh
new file mode 100755
index 000000000000..0ab0b8aa3e85
--- /dev/null
+++ i/emulators/mesen/files/launch.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec mono %%PREFIX%%/libexec/mesen/Mesen.exe $*
diff --git c/emulators/mesen/files/patch-compat i/emulators/mesen/files/patch-compat
new file mode 100644
index 000000000000..182865fd57de
--- /dev/null
+++ i/emulators/mesen/files/patch-compat
@@ -0,0 +1,116 @@
+Submitted upstream as: https://github.com/SourMesen/Mesen/pull/363
+
+--- Linux/LinuxGameController.cpp.orig	2018-03-31 19:18:23 UTC
++++ Linux/LinuxGameController.cpp
+@@ -1,6 +1,6 @@
+ #include "../Core/MessageManager.h"
+ #include "LinuxGameController.h"
+-#include "libevdev/libevdev.h"
++#include <libevdev/libevdev.h>
+ #include <unistd.h>
+ #include <stdio.h>
+ #include <string.h>
+@@ -223,4 +223,4 @@ static int print_event(struct input_event *ev)
+ 			ev->value);
+ 	return 0;
+ }
+-*/
+\ No newline at end of file
++*/
+--- Utilities/Scale2x/scalebit.cpp.orig	2018-03-31 19:18:23 UTC
++++ Utilities/Scale2x/scalebit.cpp
+@@ -39,7 +39,7 @@
+ #include <assert.h>
+ #include <stdlib.h>
+ 
+-#ifndef __MACH__
++#if !(defined(__MACH__) || defined(__FreeBSD__))
+ #include <malloc.h>
+ #endif
+ 
+--- makefile.orig	2018-03-31 19:18:23 UTC
++++ makefile
+@@ -50,11 +50,19 @@ RELEASEFOLDER=bin/$(MESENPLATFORM)/Release
+ COREOBJ=$(patsubst Core/%.cpp,Core/$(OBJFOLDER)/%.o,$(wildcard Core/*.cpp))
+ UTILOBJ=$(patsubst Utilities/%.cpp,Utilities/$(OBJFOLDER)/%.o,$(wildcard Utilities/*.cpp)) $(patsubst Utilities/HQX/%.cpp,Utilities/$(OBJFOLDER)/%.o,$(wildcard Utilities/HQX/*.cpp)) $(patsubst Utilities/xBRZ/%.cpp,Utilities/$(OBJFOLDER)/%.o,$(wildcard Utilities/xBRZ/*.cpp)) $(patsubst Utilities/KreedSaiEagle/%.cpp,Utilities/$(OBJFOLDER)/%.o,$(wildcard Utilities/KreedSaiEagle/*.cpp)) $(patsubst Utilities/Scale2x/%.cpp,Utilities/$(OBJFOLDER)/%.o,$(wildcard Utilities/Scale2x/*.cpp))
+ LINUXOBJ=$(patsubst Linux/%.cpp,Linux/$(OBJFOLDER)/%.o,$(wildcard Linux/*.cpp)) 
+-LIBEVDEVOBJ=$(patsubst Linux/libevdev/%.c,Linux/$(OBJFOLDER)/%.o,$(wildcard Linux/libevdev/*.c))
+ SEVENZIPOBJ=$(patsubst SevenZip/%.c,SevenZip/$(OBJFOLDER)/%.o,$(wildcard SevenZip/*.c))
+ LUAOBJ=$(patsubst Lua/%.c,Lua/$(OBJFOLDER)/%.o,$(wildcard Lua/*.c))
++ifeq ($(SYSTEM_LIBEVDEV), true)
++	LIBEVDEVLIB=$(shell pkg-config --libs libevdev)
++	LIBEVDEVINC=$(shell pkg-config --cflags libevdev)
++else
++	LIBEVDEVOBJ=$(patsubst Linux/libevdev/%.c,Linux/$(OBJFOLDER)/%.o,$(wildcard Linux/libevdev/*.c))
++	LIBEVDEVINC=-I../
++endif
++SDL2LIB=$(shell sdl2-config --libs)
++SDL2INC=$(shell sdl2-config --cflags)
++FSLIB=-lstdc++fs
+ 
+-
+ all: ui
+ 
+ ui: InteropDLL/$(OBJFOLDER)/$(SHAREDLIB)
+@@ -68,6 +76,7 @@ ui: InteropDLL/$(OBJFOLDER)/$(SHAREDLIB)
+ 	cd GUI.NET && xbuild /property:Configuration="Release" /property:Platform="$(MESENPLATFORM)" /property:PreBuildEvent="" /property:DefineConstants="HIDETESTMENU,DISABLEAUTOUPDATE"
+ 
+ libretro: Libretro/$(OBJFOLDER)/$(LIBRETROLIB)
++	mkdir -p ./bin
+ 	cp ./Libretro/$(OBJFOLDER)/$(LIBRETROLIB) ./bin
+ 
+ core: InteropDLL/$(OBJFOLDER)/$(SHAREDLIB)
+@@ -80,7 +89,7 @@ rungametests:
+ 
+ testhelper: InteropDLL/$(OBJFOLDER)/$(SHAREDLIB)
+ 	mkdir -p TestHelper/$(OBJFOLDER)
+-	$(CPPC) $(GCCOPTIONS) -Wl,-z,defs -o testhelper TestHelper/*.cpp InteropDLL/ConsoleWrapper.cpp $(SEVENZIPOBJ) $(LUAOBJ) $(LINUXOBJ) $(LIBEVDEVOBJ) $(UTILOBJ) $(COREOBJ) -pthread -lSDL2 -lstdc++fs
++	$(CPPC) $(GCCOPTIONS) -Wl,-z,defs -o testhelper TestHelper/*.cpp InteropDLL/ConsoleWrapper.cpp $(SEVENZIPOBJ) $(LUAOBJ) $(LINUXOBJ) $(LIBEVDEVOBJ) $(UTILOBJ) $(COREOBJ) -pthread $(FSLIB) $(SDL2LIB) $(LIBEVDEVLIB)
+ 	mv testhelper TestHelper/$(OBJFOLDER)
+ 
+ SevenZip/$(OBJFOLDER)/%.o: SevenZip/%.c
+@@ -100,19 +109,19 @@ Utilities/$(OBJFOLDER)/%.o: Utilities/Scale2x/%.cpp
+ Core/$(OBJFOLDER)/%.o: Core/%.cpp
+ 	mkdir -p Core/$(OBJFOLDER) && cd Core/$(OBJFOLDER) && $(CPPC) $(GCCOPTIONS)  -c $(patsubst Core/%, ../%, $<)
+ Linux/$(OBJFOLDER)/%.o: Linux/%.cpp
+-	mkdir -p Linux/$(OBJFOLDER) && cd Linux/$(OBJFOLDER) && $(CPPC) $(GCCOPTIONS) -c $(patsubst Linux/%, ../%, $<)
++	mkdir -p Linux/$(OBJFOLDER) && cd Linux/$(OBJFOLDER) && $(CPPC) $(GCCOPTIONS) -c $(patsubst Linux/%, ../%, $<) $(SDL2INC) $(LIBEVDEVINC)
+ Linux/$(OBJFOLDER)/%.o: Linux/libevdev/%.c
+ 	mkdir -p Linux/$(OBJFOLDER) && cd Linux/$(OBJFOLDER) && $(CC) $(CCOPTIONS) -c $(patsubst Linux/%, ../%, $<)
+ 
+ InteropDLL/$(OBJFOLDER)/$(SHAREDLIB): $(SEVENZIPOBJ) $(LUAOBJ) $(UTILOBJ) $(COREOBJ) $(LIBEVDEVOBJ) $(LINUXOBJ) InteropDLL/ConsoleWrapper.cpp InteropDLL/DebugWrapper.cpp
+ 	mkdir -p InteropDLL/$(OBJFOLDER)
+-	$(CPPC) $(GCCOPTIONS) -Wl,-z,defs -shared -o $(SHAREDLIB) InteropDLL/*.cpp $(SEVENZIPOBJ) $(LUAOBJ) $(LINUXOBJ) $(LIBEVDEVOBJ) $(UTILOBJ) $(COREOBJ) -pthread -lSDL2 -lstdc++fs
++	$(CPPC) $(GCCOPTIONS) -Wl,-z,defs -shared -o $(SHAREDLIB) InteropDLL/*.cpp $(SEVENZIPOBJ) $(LUAOBJ) $(LINUXOBJ) $(LIBEVDEVOBJ) $(UTILOBJ) $(COREOBJ) $(SDL2INC) -pthread $(FSLIB) $(SDL2LIB) $(LIBEVDEVLIB)
+ 	mv $(SHAREDLIB) InteropDLL/$(OBJFOLDER)
+ 
+ 
+ Libretro/$(OBJFOLDER)/$(LIBRETROLIB): $(SEVENZIPOBJ) $(UTILOBJ) $(COREOBJ) $(LUAOBJ) Libretro/libretro.cpp
+ 	mkdir -p Libretro/$(OBJFOLDER)
+-	$(CPPC) $(GCCOPTIONS) -Wl,-z,defs -shared -o $(LIBRETROLIB) Libretro/*.cpp $(SEVENZIPOBJ) $(UTILOBJ) $(COREOBJ) $(LUAOBJ) -pthread
++	$(CPPC) $(GCCOPTIONS) -Wl,-z,defs -shared -o $(LIBRETROLIB) Libretro/*.cpp $(SEVENZIPOBJ) $(UTILOBJ) $(COREOBJ) $(LUAOBJ) -pthread $(FSLIB)
+ 	mv $(LIBRETROLIB) Libretro/$(OBJFOLDER) 
+ 
+ debug:
+@@ -122,12 +131,12 @@ run:
+ 	mono $(RELEASEFOLDER)/Mesen.exe
+ 
+ clean:
+-	rm Lua/$(OBJFOLDER) -r -f
+-	rm SevenZip/$(OBJFOLDER) -r -f
+-	rm Utilities/$(OBJFOLDER) -r -f
+-	rm Core/$(OBJFOLDER) -r -f
+-	rm Linux/$(OBJFOLDER) -r -f
+-	rm InteropDLL/$(OBJFOLDER) -r -f
+-	rm Libretro/$(OBJFOLDER) -r -f
+-	rm TestHelper/$(OBJFOLDER) -r -f
+-	rm $(RELEASEFOLDER) -r -f
++	rm -rf Lua/$(OBJFOLDER)
++	rm -rf SevenZip/$(OBJFOLDER)
++	rm -rf Utilities/$(OBJFOLDER)
++	rm -rf Core/$(OBJFOLDER)
++	rm -rf Linux/$(OBJFOLDER)
++	rm -rf InteropDLL/$(OBJFOLDER)
++	rm -rf Libretro/$(OBJFOLDER)
++	rm -rf TestHelper/$(OBJFOLDER)
++	rm -rf $(RELEASEFOLDER)
diff --git c/emulators/mesen/pkg-descr i/emulators/mesen/pkg-descr
new file mode 100644
index 000000000000..2d12a7317342
--- /dev/null
+++ i/emulators/mesen/pkg-descr
@@ -0,0 +1,3 @@
+Mesen is a high-accuracy NES and Famicom emulator and NSF player.
+
+WWW: https://www.mesen.ca/
diff --git c/emulators/mesen/pkg-plist i/emulators/mesen/pkg-plist
new file mode 100644
index 000000000000..a2c44a11179e
--- /dev/null
+++ i/emulators/mesen/pkg-plist
@@ -0,0 +1,7 @@
+%%LIBRETRO%%lib/libretro/mesen_libretro.so
+%%MONO%%bin/mesen
+%%MONO%%libexec/mesen/Mesen.exe
+%%MONO%%libexec/mesen/libMesenCore.dll
+%%MONO%%share/icons/hicolor/16x16/apps/mesen.png
+%%MONO%%share/icons/hicolor/32x32/apps/mesen.png
+%%MONO%%share/icons/hicolor/64x64/apps/mesen.png