Add FreeBSD template.

templates/freebsd/ports/games/serioussam-alpha/Makefile

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+PORTNAME=	serioussam-alpha
+DISTNAME=	SeriousSamAlphaRemake
+DISTVERSION=	1.5.3c
+PORTREVISION=	1
+CATEGORIES=	games
+
+MAINTAINER= 	[email protected]
+COMMENT=	Open source modification for game Serious Sam Classic 
+WWW=		https://github.com/tx00100xt/SeriousSamAlphaRemake
+
+LICENSE= 	GPLv2
+LICENSE_FILE= 	${WRKSRC}/../LICENSE
+
+BUILD_DEPENDS=	flex:textproc/flex
+
+RUN_DEPENDS=	${LOCALBASE}/bin/serioussam:games/serioussam
+
+USES=		bison:build cmake compiler:c++11-lang
+USE_CXXSTD=	c++14
+
+GH_ACCOUNT=	tx00100xt
+GH_PROJECT=	SeriousSamAlphaRemake
+USE_GITHUB=	yes
+
+CMAKE_ARGS=	-DRPI4:BOOL=FALSE -DUSE_ASM:BOOL=FALSE \
+	-DUSE_SYSTEM_INSTALL:BOOL=TRUE
+
+WRKSRC_SUBDIR=	Sources
+
+post-install:
+	${INSTALL_MAN} ${WRKSRC}/../man/serioussam-alpha.1 \
+		${STAGEDIR}${PREFIX}/man/man1/serioussam-alpha.1
+
+.include <bsd.port.options.mk>
+
+.if ${ARCH} == aarch64 || ${ARCH} == armv7
+CMAKE_ON=	RPI4
+.endif
+
+.include	<bsd.port.mk>

templates/freebsd/ports/games/serioussam-alpha/distinfo

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+TIMESTAMP = 1703876564
+SHA256 (tx00100xt-SeriousSamAlphaRemake-1.5.3c_GH0.tar.gz) = 71d05c820ba234376b16767326d783634b27a1da79f56e1dc7ffff68b0fdb080
+SIZE (tx00100xt-SeriousSamAlphaRemake-1.5.3c_GH0.tar.gz) = 9432500

templates/freebsd/ports/games/serioussam-alpha/pkg-descr

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+Serious Sam Alpha is the period where Serious Sam was supposed to be a much
+bigger game than it turned out to be. Generally, this period is between the
+development of In the Flesh (1996) and Test 1 (2000).
+
+After egipet  the player would travel into 6 different planets: the Water
+Planet, Lava Planet, Green Planet, Ice Planet, Tropic Planet, and Rock
+Planet. After completing all the planets, the player would be in a level
+called Space Crusader,
+
+The "early build" of the game was made in early 1998. In the summer of 2013,
+people from SeriousSite.ru sent an email to Croteam asking for a pre-release
+version of "Serious Sam". Luckily, Roman Ribaric agreed to the request
+and shared the old version with the consent of the other members of the
+Croteam team.
+
+Download the mod content using the command: wget
+https://archive.org/download/serious-sam-alpha-remake-data/SeriousSamAlphaRemake_v1.5.tar.xz
+
+Unpack the add-on archive into the directory:
+~/.local/share/Serious-Engine/serioussam
+
+More details here: man serioussam-alpha
+https://github.com/tx00100xt/SeriousSamAlphaRemake/wiki

templates/freebsd/ports/games/serioussam-alpha/pkg-plist

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+lib/serioussam/Mods/SSA/libGame.so
+lib/serioussam/Mods/SSA/libEntities.so
+man/man1/serioussam-alpha.1.gz