Sorry, this was missed. arx-libertatis uses boost (headerfiles only). The following diff should fix this.
Index: Makefile =================================================================== RCS file: /cvs/ports/games/arx-libertatis/Makefile,v retrieving revision 1.1.1.1 diff -u -p -r1.1.1.1 Makefile --- Makefile 6 May 2018 15:15:00 -0000 1.1.1.1 +++ Makefile 8 May 2018 18:11:28 -0000 @@ -9,6 +9,7 @@ GH_ACCOUNT = arx GH_PROJECT = ArxLibertatis GH_TAGNAME = 1.1.2-r1 PKGNAME = arx-libertatis-${GH_TAGNAME:S/-r/pl/} +REVISION = 0 # GPLv3+, fonts are SIL OFL 1.1 license PERMIT_PACKAGE_CDROM = Yes @@ -21,6 +22,7 @@ COMPILER = base-clang ports-gcc ports-cl MODULES = devel/cmake +BUILD_DEPENDS = devel/boost>=1.48 LIB_DEPENDS = audio/openal \ devel/sdl \ graphics/glew