The following games will no longer build once robert updates libcxx and
friends because they use std::unary_function or std::binary_function,
which were deprecated in C++11 and removed in C++17.

An ugly workaround is to re-enable these to fix the build as in the diff
below. Another ugly workaround is to switch to a build with C++ <= 14.

Please check if upstream has fixed this already and do either one of
1. update the port
2. backport the fix
3. remove the annotations in the affected functions and test
4. if you don't like the below, figure out a better fix.

Thanks

Index: games/amnesia-tdd/Makefile
===================================================================
RCS file: /cvs/ports/games/amnesia-tdd/Makefile,v
diff -u -p -r1.7 Makefile
--- games/amnesia-tdd/Makefile	30 Apr 2023 19:05:02 -0000	1.7
+++ games/amnesia-tdd/Makefile	28 Dec 2023 05:27:24 -0000
@@ -39,6 +39,8 @@ LIB_DEPENDS =	audio/libogg \
 CONFIGURE_ARGS =	-DSYSTEMWIDE_RESOURCES=ON \
 			-DSYSTEMWIDE_RESOURCES_LOCATION="${PREFIX}/share/amnesia-tdd"
 
+CONFIGURE_ENV +=	CXXFLAGS=-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION
+
 WRKSRC =	${WRKDIST}/amnesia/src
 
 post-install:
Index: games/crack-attack/Makefile
===================================================================
RCS file: /cvs/ports/games/crack-attack/Makefile,v
diff -u -p -r1.30 Makefile
--- games/crack-attack/Makefile	26 Sep 2023 09:41:33 -0000	1.30
+++ games/crack-attack/Makefile	28 Dec 2023 02:03:58 -0000
@@ -30,6 +30,8 @@ CONFIGURE_STYLE=gnu
 CONFIGURE_ENV=	CPPFLAGS="-I${X11BASE}/include -I${LOCALBASE}/include" \
 		LDFLAGS="-L${LOCALBASE}/lib"
 
+CXXFLAGS +=	-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION
+
 post-install:
 	${INSTALL_DATA_DIR} ${PREFIX}/share/applications ${PREFIX}/share/pixmaps
 	cd ${WRKSRC}/data; \
Index: games/manaplus/Makefile
===================================================================
RCS file: /cvs/ports/games/manaplus/Makefile,v
diff -u -p -r1.106 Makefile
--- games/manaplus/Makefile	26 Sep 2023 09:41:38 -0000	1.106
+++ games/manaplus/Makefile	28 Dec 2023 00:12:24 -0000
@@ -41,6 +41,8 @@ CONFIGURE_ARGS =	--without-librt \
 			--with-sdl2 \
 			--without-internalsdlgfx
 
+CXXFLAGS =	-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION
+
 FAKE_FLAGS +=	desktopdir=${PREFIX}/share/applications/
 
 AUTOCONF_VERSION =	2.69