libGL.so was symlinked to itself. Unsurprisingly, this breaks things. Link it to
mesa/ instead.

-----
diff --git a/usr/lib/libGL.so b/usr/lib/libGL.so
index fc3a03e..e898a5b 120000
--- a/usr/lib/libGL.so
+++ b/usr/lib/libGL.so
@@ -1 +1 @@
-libGL.so
\ No newline at end of file
+mesa/libGL.so
\ No newline at end of file