libepoxy looks for libGLX.so.1, which doesn't exist

[jhenstridge]

libepoxy tries to dlopen libGLX.so.1 as a GL implementation:

libepoxy/src/dispatch_common.c

Lines 192 to 193 in 2df68f8

	#define GLVND_GLX_LIB "libGLX.so.1"
	#define GLX_LIB "libGL.so.1"

libepoxy/src/dispatch_common.c

Lines 550 to 557 in 2df68f8

	# ifdef GLVND_GLX_LIB
	/* prefer the glvnd library if it exists */
	if (!api.glx_handle)
	get_dlopen_handle(&api.glx_handle, GLVND_GLX_LIB, false, load);
	# endif
	if (!api.glx_handle)
	get_dlopen_handle(&api.glx_handle, GLX_LIB, exit_if_fails, load);
	#endif

But glvnd builds libGLX.so.0 (as can be seen e.g. here and here). So the code path is always going to fall back to loading libGL.so.1.

Trying to open a library version that doesn't yet exist seems like a bad idea: what if it eventually does get created and doesn't have the expected ABI?