[build error] opengl enabled, but sdl configured with opengl disabled

[spyjoshx]

OS: Fedora 37 (GNOME) x86_64
I installed the packages in INSTALL.txt (SLD_image-devel was not found, but was listed as optional so I ignored) and ran scons, but it stopped with the following full output:

scons: Reading SConscript files ...
===== D1X-Rebirth v0.61.0 0.60.0-beta2-696-gd2e190ec3d5e d2e190ec3d5e6257e82773e331e467bd20545cf7 =====
===== D2X-Rebirth v0.61.0 0.60.0-beta2-696-gd2e190ec3d5e d2e190ec3d5e6257e82773e331e467bd20545cf7 =====
DXX-Archive.3: compiling on 'linux'/'x86_64' for 'linux' into build/
DXX-Archive.3: checking version of C++ compiler 'g++' ... 'g++ (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4)'
DXX-Archive.3: checking path to assembler ... b'as'
DXX-Archive.3: checking version of assembler b'as' ... 'GNU assembler version 2.38-25.fc37'
DXX-Archive.3: checking path to linker ... b'ld'
DXX-Archive.3: checking version of linker b'ld' ... 'GNU ld version 2.38-25.fc37'
DXX-Archive.3: CHOST: None
DXX-Archive.3: CXX: 'g++'
DXX-Archive.3: CPPDEFINES: [('PHYSFS_DEPRECATED', '')]
DXX-Archive.3: CPPPATH: ['common/include', 'common/main', '.', 'build/']
DXX-Archive.3: CPPFLAGS: ['-Wno-sign-compare']
DXX-Archive.3: CXXFLAGS: ['-g', '-O2', '-ftabstop=4', '-Wall', '-Werror=extra', '-Werror=format=2', '-Werror=missing-braces', '-Werror=missing-include-dirs', '-Werror=uninitialized', '-Werror=undef', '-Werror=pointer-arith', '-Werror=cast-qual', '-Werror=missing-declarations', '-Werror=vla', '-pthread', '-funsigned-char']
DXX-Archive.3: LIBS: None
DXX-Archive.3: LINKFLAGS: []
DXX-Archive.3: $CCACHE_PREFIX: None
DXX-Archive.3: $DISTCC_HOSTS: None
DXX-Archive.3: checking whether C++ compiler and linker work...yes
DXX-Archive.3: checking whether C++ compiler accepts -std=gnu++20...yes
DXX-Archive.3: checking endian to use...little
DXX-Archive.3: checking whether to enable word alignment fixups...no
DXX-Archive.3: building with OpenGL
DXX-Archive.3: checking whether to enable release options...yes
DXX-Archive.3: checking whether to enable memory allocation tracking...no
DXX-Archive.3: checking whether to enable level editor...no
DXX-Archive.3: checking whether to enable IPv6 support...no
DXX-Archive.3: checking whether to enable multiplayer over UDP...yes
DXX-Archive.3: checking whether to enable UDP game tracker...yes
DXX-Archive.3: checking how to handle ADL MIDI...disabled
DXX-Archive.3: checking how to format screenshots...png
DXX-Archive.3: checking libpng pkg-config libpng
DXX-Archive.3: using pkg-config at discovered path /usr/bin/pkg-config
DXX-Archive.3: reading libpng version from ('/usr/bin/pkg-config', '--modversion', 'libpng')
DXX-Archive.3: libpng version: b'1.6.37'
DXX-Archive.3: reading libpng settings from ('/usr/bin/pkg-config', '--cflags', '--libs', 'libpng')
DXX-Archive.3: libpng settings: {'CPPPATH': ['/usr/include/libpng16'], 'LIBS': ['png16', 'z']}
DXX-Archive.3: checking for usable library png...yes
DXX-Archive.3: checking physfs pkg-config physfs
DXX-Archive.3: reading physfs version from ('/usr/bin/pkg-config', '--modversion', 'physfs')
DXX-Archive.3: physfs version: b'3.0.2'
DXX-Archive.3: reading physfs settings from ('/usr/bin/pkg-config', '--cflags', '--libs', 'physfs')
DXX-Archive.3: physfs settings: {'LIBPATH': ['/usr/lib'], 'LIBS': ['physfs']}
DXX-Archive.3: checking for usable library physfs...yes
DXX-Archive.3: checking for usable library ['GL', 'GLU']...yes
DXX-Archive.3: checking SDL pkg-config sdl
DXX-Archive.3: reading sdl version from ('/usr/bin/pkg-config', '--modversion', 'sdl')
DXX-Archive.3: SDL version: b'1.2.60'
DXX-Archive.3: reading SDL settings from ('/usr/bin/pkg-config', '--cflags', '--libs', 'sdl')
DXX-Archive.3: SDL settings: {'CPPDEFINES': [['_GNU_SOURCE', '1'], '_REENTRANT'], 'CPPPATH': ['/usr/include/SDL'], 'LIBS': ['SDL']}
DXX-Archive.3: checking whether to enable joystick support...yes
DXX-Archive.3: checking for usable library SDL with OpenGL...no
DXX-Archive.3: checking for usable header SDL.h...no
DXX-Archive.3: checking whether compiler can parse header SDL.h...yes
DXX-Archive.3: checking for usable library SDL without OpenGL...yes
scons: *** Rebirth configured with OpenGL enabled, but SDL configured with OpenGL disabled.  Disable Rebirth OpenGL or install an SDL with OpenGL enabled.  See build/sconf.log for details.  Stop.

Attaching sconf.log that the error mentions.
sconf.log

[vLKp]

This test checks that your SDL headers define SDL_VIDEO_OPENGL, and exits with an error if that symbol is not defined. What options were specified when your SDL package was built? What is the content of /usr/include/SDL/SDL_config.h?

[spyjoshx]

Unsure as to how my particular SDL package was built, as I just installed whatever the default one was with dnf. Attaching the contents of my SLD_config.h
header_contents.txt

[spyjoshx]

update:
The above issue was fixed by switching to SDL2, and installing mesa-libGLU-devel, however, the build is now showing that it can't find SDL.h, which is definitely there in /usr/include/SDL2/SDL.h

[vLKp]

That header appears to be owned by sdl12-compat-devel, which uses SDL2 to emulate SDL1. The header path I gave is appropriate when using real SDL1. When using SDL2, you need to follow that header through to the underlying platform-specific header:

#elif defined(__x86_64__)
#include "SDL_config-x86_64.h"

Native SDL2 is supported, and finds its headers on its own. If you need help with that, please provide the logs from the failed build.

[spyjoshx]

Sorry for the late response. Here's my situation. I have both sld2 and dls12-compat installed, but it still says the header is missing. If it's officially supported, I guess I'd prefer to try native sdl2 just because I want to help test, but I don't see any documentation on how to build with it (or is scons supposed to automatically detect it? If it is, it's not working...).

[vLKp]

Since SDL1 and SDL2 can be concurrently installed, SCons does not automatically pick one over the other. It presently defaults to SDL1, but you can pass sdl2=1 to scons to switch to SDL2.

[spyjoshx]

Hmm... That's what I tried, but it's still telling me that it can't find SDL.h. sdl2=1 just goes after the scons command, right?

[vLKp]

Yes.

[vLKp]

A similar report from a Gentoo user is now listed in the Gentoo bug tracker at https://bugs.gentoo.org/show_bug.cgi?id=900212 . It does not provide the requisite log to confirm the problem, but that user also is using a package that uses SDL2 to emulate SDL1. I am inclined to consider this a bug in the emulation package, since it purports to work like SDL1, but does not behave like SDL1.

[vLKp]

As I noted above, I consider this a bug in the emulation package. However, per the comment in @chewi's pull request #720, this appears to be by design in the emulation package. Therefore, I merged @chewi's change to bypass this check when using the emulation package.