diff --git a/games-fps/dhewm3/additional-files/dhewm3.rdef.in b/games-fps/dhewm3/additional-files/dhewm3.rdef.in
new file mode 100644
index 000000000..f5a8a1d72
--- /dev/null
+++ b/games-fps/dhewm3/additional-files/dhewm3.rdef.in
@@ -0,0 +1,33 @@
+
+resource app_flags B_SINGLE_LAUNCH | B_ARGV_ONLY;
+
+resource app_version {
+	major  = @MAJOR@,
+	middle = @MIDDLE@,
+	minor  = @MINOR@,
+
+	variety = B_APPV_FINAL,
+	internal = 0,
+
+	short_info = "dhewm3",
+	long_info = "@LONG_INFO@"
+};
+
+resource app_signature "@APP_SIGNATURE@";
+
+
+resource vector_icon {
+	$"6E6369660302000602B0A5EA3C7F30BC3FEBB062CF4B1F614AA26A00930303FF"
+	$"00000002000602AD25FE3D612ABD9FFEAD60864AE91349F1AD00F3A73BFFFF00"
+	$"00040062080A0EEA6266E9FC48E7325AE46843E4685DE13858E0D253E0D220E4"
+	$"CE21E79836EAC821F0C220EEC426EEC4700A07B59BB4F41F2041204525455344"
+	$"56B59CD2D80A053E4C3E323A2C302C30590607362A4D52235020502050206468"
+	$"23695A5F640A06602D592C542F54496153612F0A07D208CA3CD205B44CD3BDB3"
+	$"01DC0A20DE0824DE0854D6F3CDE20A06DAD84ADAD830D9A62C7A2C7630765304"
+	$"07E22E394847404F4651C187C5D3C2E8C7664757405C465C3A5C3957060A0201"
+	$"0712402E400000000000003D2499440C494A6DB401178822040A020701020304"
+	$"050600123D22AB0000000000003A36C742F846498E3801178A22040A00070102"
+	$"0304050600123D22AB0000000000003D98903FE11A42000001178A22040A0107"
+	$"01020304050600023D22AB0000000000003D98903FE11A4200000A0001071001"
+	$"178822040A010107100117832204"
+};
diff --git a/games-fps/dhewm3/dhewm3-1.5.1.recipe b/games-fps/dhewm3/dhewm3-1.5.1.recipe
new file mode 100644
index 000000000..e92027a7c
--- /dev/null
+++ b/games-fps/dhewm3/dhewm3-1.5.1.recipe
@@ -0,0 +1,175 @@
+SUMMARY="A Doom 3 GPL source modification"
+DESCRIPTION="dhewm3 is a source port of the original Doom3 (not Doom3 BFG, for that \
+you may want to try RBDoom3BFG). It's known to work on Windows, Linux, macOS, FreeBSD, \
+OpenBSD and AROS, but it should work on (or be easily portable to) any system that \
+supports OpenGL 1.4 with ARB shaders, SDL and OpenAL.
+
+Compared to the original version of Doom3, dhewm3 has many bugfixes, supports \
+EAX-like sound effects on all operating systems and hardware (via OpenAL Softs EFX \
+support), has much better support for widescreen resolutions and has 64bit support.
+
+Note that while the Doom3 source code has been released under GPL, you still need \
+to legally own the game and provide dhewm3 the game data to play."
+HOMEPAGE="https://dhewm3.org/"
+COPYRIGHT="
+	2011-2019 dhewm3 teams, and contributors
+	2004 id Software
+	"
+LICENSE="GNU GPL v3"
+REVISION="1"
+SOURCE_URI="https://github.com/dhewm/dhewm3/archive/${portVersion}_PRE1.tar.gz"
+CHECKSUM_SHA256="bb454cfdf6e698bac2c6b1cfca19d7b1381b8a59cfb8bc4d38b483b7ee23da47"
+SOURCE_DIR="dhewm3-${portVersion}_PRE1"
+#cdoom mod
+srcGitRev2="5070b8c7ec6f3a8ba1cb4123de37732f9cd9437f"
+SOURCE_URI_2="https://github.com/dhewm/dhewm3-sdk/archive/$srcGitRev2.tar.gz"
+CHECKSUM_SHA256_2="301d4114a11859fb7a0f9ee1ecae50a8de5ba6add0e3564b54af9b5b972ec710"
+SOURCE_DIR_2="dhewm3-sdk-$srcGitRev2"
+#rivensin mod
+srcGitRev3="b651f9dc1ddb958eaee3f0a1373fc4af7dce67e5"
+SOURCE_URI_3="https://github.com/dhewm/dhewm3-sdk/archive/$srcGitRev3.tar.gz"
+CHECKSUM_SHA256_3="334b2a882b05f00a8120ece8944974de0625f4dc439dd8b8505c358c04a7948a"
+SOURCE_DIR_3="dhewm3-sdk-$srcGitRev3"
+#denton mod
+srcGitRev4="aaec7be6276661d6c9e612de99ffe8af33828404"
+SOURCE_URI_4="https://github.com/dhewm/dhewm3-sdk/archive/$srcGitRev4.tar.gz"
+CHECKSUM_SHA256_4="16e6e3a67b6d9efe66cd3b6a4918f4d4b046aef21f83ed4c3125832634df7458"
+SOURCE_DIR_4="dhewm3-sdk-$srcGitRev4"
+#fitz mod
+srcGitRev5="6ebb6b8394c047dd042aec47fa79ddec2b901754"
+SOURCE_URI_5="https://github.com/dhewm/dhewm3-sdk/archive/$srcGitRev5.tar.gz"
+CHECKSUM_SHA256_5="12ed335709af159179e7d20e88a8f03b7481ace443315edb00c4a8d8df32b741"
+SOURCE_DIR_5="dhewm3-sdk-$srcGitRev5"
+#hardqore2 mod
+srcGitRev6="024a8683431e2b06847d585fc1e75968310b0548"
+SOURCE_URI_6="https://github.com/dhewm/dhewm3-sdk/archive/$srcGitRev6.tar.gz"
+CHECKSUM_SHA256_6="a5f62a616eba85a40af2cf6d029a032eb574a7b0f567fcfe005e04b7e6b42eb3"
+SOURCE_DIR_6="dhewm3-sdk-$srcGitRev6"
+#launcher
+srcGitRev7="d5157392c6f63ec82aaa715e74b364c284701536"
+SOURCE_URI_7="https://github.com/EXL/BeGameLauncher/archive/$srcGitRev7.tar.gz"
+CHECKSUM_SHA256_7="ef1c197be64590ba509c7cf6c6f758475ebcdac1d014e596e32d26b12b024f16"
+SOURCE_DIR_7="BeGameLauncher-$srcGitRev7"
+
+PATCHES="dhewm3-$portVersion.patchset"
+PATCHES_2="dhewm3_mods-$portVersion.patchset"
+PATCHES_3="dhewm3_mods-$portVersion.patchset"
+PATCHES_4="dhewm3_mods-$portVersion.patchset"
+PATCHES_5="dhewm3_mods-$portVersion.patchset"
+PATCHES_6="dhewm3_mods-$portVersion.patchset"
+
+ADDITIONAL_FILES="dhewm3.rdef.in"
+
+ARCHITECTURES="!x86_gcc2 x86_64"
+SECONDARY_ARCHITECTURES="x86"
+
+PROVIDES="
+	dhewm3$secondaryArchSuffix = $portVersion
+	app:dhewm3
+	"
+REQUIRES="
+	haiku$secondaryArchSuffix
+	lib:libGL$secondaryArchSuffix
+	lib:libjpeg$secondaryArchSuffix
+	lib:libogg$secondaryArchSuffix
+	lib:libopenal$secondaryArchSuffix
+	lib:libSDL2_2.0$secondaryArchSuffix
+	lib:libvorbis$secondaryArchSuffix
+	lib:libvorbisfile$secondaryArchSuffix
+	lib:libz$secondaryArchSuffix
+	"
+
+BUILD_REQUIRES="
+	haiku${secondaryArchSuffix}_devel
+	devel:libGL$secondaryArchSuffix
+	devel:libjpeg$secondaryArchSuffix
+	devel:libogg$secondaryArchSuffix
+	devel:libopenal$secondaryArchSuffix
+	devel:libSDL2_2.0$secondaryArchSuffix
+	devel:libvorbis$secondaryArchSuffix
+	devel:libvorbisfile$secondaryArchSuffix
+	devel:libz$secondaryArchSuffix
+	"
+BUILD_PREREQUIRES="
+	cmd:cmake
+	cmd:gcc$secondaryArchSuffix
+	cmd:install
+	cmd:ld$secondaryArchSuffix
+	cmd:make
+	cmd:pkg_config$secondaryArchSuffix
+	"
+
+BUILD()
+{
+	mkdir -p build
+	cd build
+	cmake ../neo \
+		-DCMAKE_BUILD_TYPE=Release	\
+		-DSDL2_INCLUDE_DIR=/system/$relativeIncludeDir/SDL2
+	make $jobArgs
+	cd ..
+
+	# build mod: classic doom
+	mkdir -p build_cdoom
+	cd build_cdoom
+	cmake $sourceDir2 -DCMAKE_BUILD_TYPE=Release
+	make $jobArgs
+	cd ..
+	# build mod: rivensin
+	mkdir -p build_rivensin
+	cd build_rivensin
+	cmake $sourceDir3 -DCMAKE_BUILD_TYPE=Release
+	make $jobArgs
+	cd ..
+	# build mod: dentonmod
+	mkdir -p build_dentonmod
+	cd build_dentonmod
+	cmake $sourceDir4 -DCMAKE_BUILD_TYPE=Release
+	make $jobArgs
+	cd ..
+	# build mod: fitz
+	mkdir -p build_fitz
+	cd build_fitz
+	cmake $sourceDir5 -DCMAKE_BUILD_TYPE=Release
+	make $jobArgs
+	cd ..
+	# build mod: hardqore2
+	mkdir -p build_hardqore2
+	cd build_hardqore2
+	cmake $sourceDir6 -DCMAKE_BUILD_TYPE=Release
+	make $jobArgs
+	cd ..
+	# build launcher
+	mkdir -p build_launcher
+	cd build_launcher
+	cmake $sourceDir7 \
+		-DCMAKE_BUILD_TYPE=Release \
+		-DLAUNCHER=dhewm3
+	make $jobArgs
+}
+
+INSTALL()
+{
+	mkdir -p $appsDir/dhewm3/lib
+
+	cp build/dhewm3 $appsDir/dhewm3
+	cp build/*.so $appsDir/dhewm3/lib
+	cp build_{cdoom,rivensin,dentonmod,fitz,hardqore2}/*.so $appsDir/dhewm3/lib
+	cp build_launcher/Dhewm3Launcher "$appsDir/dhewm3/dhewm3 Launcher"
+
+	local APP_SIGNATURE="application/x-vnd.dhewm3"
+	local MAJOR="`echo "$portVersion" | cut -d. -f1`"
+	local MIDDLE="`echo "$portVersion" | cut -d. -f2`"
+	local MINOR="`echo "$portVersion" | cut -d. -f3`"
+	local LONG_INFO="$SUMMARY"
+	sed \
+		-e "s|@APP_SIGNATURE@|$APP_SIGNATURE|" \
+		-e "s|@MAJOR@|$MAJOR|" \
+		-e "s|@MIDDLE@|$MIDDLE|" \
+		-e "s|@MINOR@|$MINOR|" \
+		-e "s|@LONG_INFO@|$LONG_INFO|" \
+		$portDir/additional-files/dhewm3.rdef.in > build/dhewm3.rdef
+
+	addResourcesToBinaries build/dhewm3.rdef $appsDir/dhewm3/dhewm3
+	addAppDeskbarSymlink "$appsDir/dhewm3/dhewm3 Launcher" "DOOM 3"
+}
diff --git a/games-fps/dhewm3/patches/dhewm3-1.5.1.patchset b/games-fps/dhewm3/patches/dhewm3-1.5.1.patchset
new file mode 100644
index 000000000..bc25c0bbd
--- /dev/null
+++ b/games-fps/dhewm3/patches/dhewm3-1.5.1.patchset
@@ -0,0 +1,141 @@
+From d67cdbebce674f27a6db45356d1c25ee9534825f Mon Sep 17 00:00:00 2001
+From: Gerasim Troeglazov <3dEyes@gmail.com>
+Date: Fri, 1 Nov 2019 15:54:40 +1000
+Subject: Fix for Haiku
+
+
+diff --git a/neo/CMakeLists.txt b/neo/CMakeLists.txt
+index 194f34d..ad4f50d 100644
+--- a/neo/CMakeLists.txt
++++ b/neo/CMakeLists.txt
+@@ -285,6 +285,12 @@ if(WIN32)
+ 	)
+ endif()
+ 
++if(HAIKU)
++	set(sys_libs ${sys_libs}
++		network
++	)
++endif()
++
+ # fallback for cmake versions without GNUInstallDirs
+ if(GNUINSTALLDIRS MATCHES "NOTFOUND")
+ 	set(CMAKE_INSTALL_BINDIR		"bin"
+diff --git a/neo/framework/minizip/ioapi.c b/neo/framework/minizip/ioapi.c
+index f59b904..499e29a 100644
+--- a/neo/framework/minizip/ioapi.c
++++ b/neo/framework/minizip/ioapi.c
+@@ -17,7 +17,7 @@
+         #define _CRT_SECURE_NO_WARNINGS
+ #endif
+ 
+-#if defined(__APPLE__) || defined(IOAPI_NO_64) || defined(__OpenBSD__)
++#if defined(__APPLE__) || defined(IOAPI_NO_64) || defined(__OpenBSD__) || defined(__HAIKU__)
+ // In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
+ #define FOPEN_FUNC(filename, mode) fopen(filename, mode)
+ #define FTELLO_FUNC(stream) ftello(stream)
+diff --git a/neo/idlib/Str.cpp b/neo/idlib/Str.cpp
+index b37e1a9..db74996 100644
+--- a/neo/idlib/Str.cpp
++++ b/neo/idlib/Str.cpp
+@@ -224,7 +224,7 @@ int idStr::FindText( const char *str, const char *text, bool casesensitive, int
+ 			}
+ 		} else {
+ 			for ( j = 0; text[j]; j++ ) {
+-				if ( ::toupper( str[i+j] ) != ::toupper( text[j] ) ) {
++				if ( toupper( str[i+j] ) != toupper( text[j] ) ) {
+ 					break;
+ 				}
+ 			}
+@@ -302,7 +302,7 @@ bool idStr::Filter( const char *filter, const char *name, bool casesensitive ) {
+ 							}
+ 						}
+ 						else {
+-							if ( ::toupper(*name) >= ::toupper(*filter) && ::toupper(*name) <= ::toupper(*(filter+2)) ) {
++							if ( toupper(*name) >= toupper(*filter) && toupper(*name) <= toupper(*(filter+2)) ) {
+ 								found = true;
+ 							}
+ 						}
+@@ -315,7 +315,7 @@ bool idStr::Filter( const char *filter, const char *name, bool casesensitive ) {
+ 							}
+ 						}
+ 						else {
+-							if ( ::toupper(*filter) == ::toupper(*name) ) {
++							if ( toupper(*filter) == toupper(*name) ) {
+ 								found = true;
+ 							}
+ 						}
+@@ -342,7 +342,7 @@ bool idStr::Filter( const char *filter, const char *name, bool casesensitive ) {
+ 				}
+ 			}
+ 			else {
+-				if ( ::toupper(*filter) != ::toupper(*name) ) {
++				if ( toupper(*filter) != toupper(*name) ) {
+ 					return false;
+ 				}
+ 			}
+diff --git a/neo/sys/platform.h b/neo/sys/platform.h
+index 2c4ce98..ef8e8a3 100644
+--- a/neo/sys/platform.h
++++ b/neo/sys/platform.h
+@@ -134,7 +134,7 @@ If you have questions concerning this license or the applicable additional terms
+ 
+ 
+ // Unix
+-#ifdef __unix__
++#if defined(__unix__) || defined(__HAIKU__)
+ 
+ #define _alloca						alloca
+ #define _alloca16( x )				((void *)((((uintptr_t)alloca( (x)+15 )) + 15) & ~15))
+diff --git a/neo/sys/posix/posix_net.cpp b/neo/sys/posix/posix_net.cpp
+index db83fa9..ec240e9 100644
+--- a/neo/sys/posix/posix_net.cpp
++++ b/neo/sys/posix/posix_net.cpp
+@@ -273,6 +273,7 @@ NET_InitNetworking
+ */
+ void Sys_InitNetworking(void)
+ {
++#ifndef __HAIKU__
+ 	unsigned int ip, mask;
+ 	struct ifaddrs *ifap, *ifp;
+ 
+@@ -319,6 +320,7 @@ void Sys_InitNetworking(void)
+ 			break;
+ 	}
+ 	freeifaddrs(ifap);
++#endif
+ }
+ 
+ /*
+-- 
+2.23.0
+
+
+From dbcdc3950ccc91134934009b18ff63dedf9fee68 Mon Sep 17 00:00:00 2001
+From: Gerasim Troeglazov <3dEyes@gmail.com>
+Date: Sat, 2 Nov 2019 15:45:47 +1000
+Subject: Add env for base dir
+
+
+diff --git a/neo/sys/linux/main.cpp b/neo/sys/linux/main.cpp
+index 5e08e2d..3efde5b 100644
+--- a/neo/sys/linux/main.cpp
++++ b/neo/sys/linux/main.cpp
+@@ -55,6 +55,14 @@ bool Sys_GetPath(sysPath_t type, idStr &path) {
+ 
+ 	switch(type) {
+ 	case PATH_BASE:
++#ifdef __HAIKU__
++		s = getenv("BASE_GAMEDIR");
++		if (s) {
++			idStr::snPrintf(buf, sizeof(buf), "%s/", s);
++			path = buf;
++			return true;
++		}
++#endif
+ 		if (stat(BUILD_DATADIR, &st) != -1 && S_ISDIR(st.st_mode)) {
+ 			path = BUILD_DATADIR;
+ 			return true;
+-- 
+2.23.0
+
diff --git a/games-fps/dhewm3/patches/dhewm3_mods-1.5.1.patchset b/games-fps/dhewm3/patches/dhewm3_mods-1.5.1.patchset
new file mode 100644
index 000000000..d6a141678
--- /dev/null
+++ b/games-fps/dhewm3/patches/dhewm3_mods-1.5.1.patchset
@@ -0,0 +1,62 @@
+From 106b3d010ce2961f876d09886ed5a6d394eb123a Mon Sep 17 00:00:00 2001
+From: Gerasim Troeglazov <3dEyes@gmail.com>
+Date: Fri, 1 Nov 2019 18:49:10 +1000
+Subject: Fix build for Haiku
+
+
+diff --git a/idlib/Str.cpp b/idlib/Str.cpp
+index b37e1a9..db74996 100644
+--- a/idlib/Str.cpp
++++ b/idlib/Str.cpp
+@@ -224,7 +224,7 @@ int idStr::FindText( const char *str, const char *text, bool casesensitive, int
+ 			}
+ 		} else {
+ 			for ( j = 0; text[j]; j++ ) {
+-				if ( ::toupper( str[i+j] ) != ::toupper( text[j] ) ) {
++				if ( toupper( str[i+j] ) != toupper( text[j] ) ) {
+ 					break;
+ 				}
+ 			}
+@@ -302,7 +302,7 @@ bool idStr::Filter( const char *filter, const char *name, bool casesensitive ) {
+ 							}
+ 						}
+ 						else {
+-							if ( ::toupper(*name) >= ::toupper(*filter) && ::toupper(*name) <= ::toupper(*(filter+2)) ) {
++							if ( toupper(*name) >= toupper(*filter) && toupper(*name) <= toupper(*(filter+2)) ) {
+ 								found = true;
+ 							}
+ 						}
+@@ -315,7 +315,7 @@ bool idStr::Filter( const char *filter, const char *name, bool casesensitive ) {
+ 							}
+ 						}
+ 						else {
+-							if ( ::toupper(*filter) == ::toupper(*name) ) {
++							if ( toupper(*filter) == toupper(*name) ) {
+ 								found = true;
+ 							}
+ 						}
+@@ -342,7 +342,7 @@ bool idStr::Filter( const char *filter, const char *name, bool casesensitive ) {
+ 				}
+ 			}
+ 			else {
+-				if ( ::toupper(*filter) != ::toupper(*name) ) {
++				if ( toupper(*filter) != toupper(*name) ) {
+ 					return false;
+ 				}
+ 			}
+diff --git a/sys/platform.h b/sys/platform.h
+index 2c4ce98..ef8e8a3 100644
+--- a/sys/platform.h
++++ b/sys/platform.h
+@@ -134,7 +134,7 @@ If you have questions concerning this license or the applicable additional terms
+ 
+ 
+ // Unix
+-#ifdef __unix__
++#if defined(__unix__) || defined(__HAIKU__)
+ 
+ #define _alloca						alloca
+ #define _alloca16( x )				((void *)((((uintptr_t)alloca( (x)+15 )) + 15) & ~15))
+-- 
+2.23.0
+