Hi

I see SQLITE_ENABLE_COMMENTS in comments of src/vdbe.h. I assume should instead be SQLITE_ENABLE_EXPLAIN_COMMENTS.

In other words, this patch should fix it:

$ fossil diff
Index: src/vdbe.h
==================================================================
--- src/vdbe.h
+++ src/vdbe.h
@@ -317,11 +317,11 @@
 int sqlite3NotPureFunc(sqlite3_context*);
 #ifdef SQLITE_ENABLE_BYTECODE_VTAB
 int sqlite3VdbeBytecodeVtabInit(sqlite3*);
 #endif

-/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
+/* Use SQLITE_ENABLE_EXPLAIN_COMMENTS to enable generation of extra comments on
 ** each VDBE opcode.
 **
 ** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
 ** comments in VDBE programs that show key decision points in the code
 ** generator.