While updating Alephone I ran into a linking issue with the GL backend. I
disabled the GL backend so at least the core game engine could be updated
when working on updating FFmpeg.

But circling back to this now. It seems like our Mesa libGL is missing
this function as well as a lot of others. When I compare our Mesa libGL
to Linux and FreeBSD's copies; they have a lot more functions including the
missing function below. They both have exactly the same number of functions,
3493, compared to our 1655.

ld: error: undefined symbol: glBlitFramebufferEXT

openbsd-arm64$ objdump -T libGL.so.19.1 | grep glBlitFramebuffer
00000000000baec8 g    DF .text  00000000000000ac glBlitFramebuffer

brad@freebsd-vmware-amd64:/usr/local/lib $ objdump -T libGL.so.1.7.0 | grep glBlitFramebuffer
00000000000623a0 g    DF wtext  0000000000000000              glBlitFramebufferANGLE
0000000000062380 g    DF wtext  0000000000000000              glBlitFramebuffer
00000000000623c0 g    DF wtext  0000000000000000              glBlitFramebufferEXT
00000000000623e0 g    DF wtext  0000000000000000              glBlitFramebufferNV


Index: Makefile
===================================================================
RCS file: /cvs/ports/games/alephone/alephone/Makefile,v
retrieving revision 1.36
diff -u -p -u -p -r1.36 Makefile
--- Makefile	24 Nov 2024 08:54:58 -0000	1.36
+++ Makefile	27 Nov 2024 03:30:34 -0000
@@ -5,6 +5,7 @@ COMMENT =		open source game engine based
 DATE =			20240822
 DISTNAME =		AlephOne-${DATE}
 PKGNAME =		alephone-1.10
+REVISION =		0
 CATEGORIES =		games x11
 EXTRACT_SUFX =		.tar.bz2
 
@@ -19,12 +20,10 @@ PERMIT_PACKAGE =	Yes
 
 SITES =			https://github.com/Aleph-One-Marathon/alephone/releases/download/release-${DATE}/
 
-WANTLIB += ${COMPILER_LIBCXX} SDL2 SDL2_image SDL2_net
+WANTLIB += ${COMPILER_LIBCXX} GL GLU SDL2 SDL2_image SDL2_net
 WANTLIB += SDL2_ttf avcodec avformat avutil boost_filesystem boost_system
 WANTLIB += c curl m openal png sndfile swresample swscale z zzip
 
-# GL GLU
-
 # C++17
 COMPILER =		base-clang ports-gcc
 
@@ -44,8 +43,7 @@ RUN_DEPENDS =		devel/desktop-file-utils 
 
 USE_GMAKE =		Yes
 CONFIGURE_STYLE =	gnu
-CONFIGURE_ARGS +=	--disable-opengl \
-			--without-miniupnpc
+CONFIGURE_ARGS +=	--without-miniupnpc
 CONFIGURE_ENV =		CPPFLAGS=-I${LOCALBASE}/include \
 			LDFLAGS=-L${LOCALBASE}/lib