diff -r 42ef99a1bde2 src/video/x11/SDL_x11opengl.c
--- a/src/video/x11/SDL_x11opengl.c	Thu Apr 02 12:27:29 2020 -0700
+++ b/src/video/x11/SDL_x11opengl.c	Sun Apr 05 16:55:27 2020 +0100
@@ -32,8 +32,12 @@
 #include "SDL_loadso.h"
 #include "SDL_x11opengles.h"
 
-#if defined(__IRIX__)
-/* IRIX doesn't have a GL library versioning system */
+#if defined(__IRIX__) || defined(__NetBSD__)
+/*
+ * IRIX doesn't have a GL library versioning system.
+ * NetBSD has different GL library versions depending on how the library was
+ * installed (package vs. xsrc).
+ */
 #define DEFAULT_OPENGL  "libGL.so"
 #elif defined(__MACOSX__)
 #define DEFAULT_OPENGL  "/opt/X11/lib/libGL.1.dylib"