Here is a diff that unbreaks crashing when toggling fullscreen in singleplayer. I used LD_DEBUG=1 to see the differences between openjk_sp and openjk.[1] I eventually found that openjk is linked with -lGL -lGLU whereas openjk_sp lacks these flags.
I opened a pull request.[2] Feedback and tests are welcome. OK? Footnotes: [1] https://gist.github.com/namtsui/3f227e9f9e6e16c804e76efecf0f2a46 [2] https://github.com/JACoders/OpenJK/pull/1037#issuecomment-833410518 Index: Makefile =================================================================== RCS file: /cvs/ports/games/openjk/Makefile,v retrieving revision 1.12 diff -u -p -u -p -r1.12 Makefile --- Makefile 7 Feb 2021 18:59:12 -0000 1.12 +++ Makefile 6 May 2021 10:45:55 -0000 @@ -8,6 +8,7 @@ CATEGORIES = games x11 GH_ACCOUNT = JACoders GH_PROJECT = OpenJK GH_COMMIT = d2ed03a016f54917bc1dcf06bcc59d3f674fb533 +REVISION = 0 HOMEPAGE = https://openjk.org/ MAINTAINER = Brian Callahan <[email protected]> Index: patches/patch-code_CMakeLists_txt =================================================================== RCS file: patches/patch-code_CMakeLists_txt diff -N patches/patch-code_CMakeLists_txt --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ patches/patch-code_CMakeLists_txt 6 May 2021 10:45:55 -0000 @@ -0,0 +1,28 @@ +$OpenBSD$ + +Add -lGL and -lGLU to openjk_sp + +see: https://github.com/JACoders/OpenJK/pull/1037 + +Unbreaks crash when toggling fullscreen in the singleplayer binary on +OpenBSD. openjk (multiplayer binary) uses -lGL and -lGLU but openjk_sp +did not. + +Index: code/CMakeLists.txt +--- code/CMakeLists.txt.orig ++++ code/CMakeLists.txt +@@ -45,6 +45,14 @@ if(BuildSPEngine OR BuildJK2SPEngine) + "${GSLIncludeDirectory}") + + # Dependencies ++ ++ if (NOT WIN32) ++ # OpenGL ++ find_package(OpenGL REQUIRED) ++ set(SPEngineIncludeDirectories ${SPEngineIncludeDirectories} ${OPENGL_INCLUDE_DIR}) ++ set(SPEngineLibraries ${SPEngineLibraries} ${OPENGL_LIBRARIES}) ++ endif() ++ + # OpenAL (is optionally included for Windows) + if(MSVC AND NOT WIN64) + if(UseInternalOpenAL)
