LLVM API produces invalid IR for ptr type

I am using LLVM 15 and I am trying to compile a language of my own (pretty much like Pascal in terms of syntax) to LLVM IR and I am using Ocaml.When I try to create a struct and set its body to have ptr elements, then when I get a reference to that field of the struct and store to it, it has type str* which is invalid.Here is a sample ocaml code that produces this:

let frame = named_struct_type llvm.context "frame1" instruct_set_body frame ([| pointer_type2 llvm.ctx |]) false;let frame_ptr = build_alloca frame ("frame_ptr") llvm.builder inlet base = build_struct_gep2 frame frame_ptr 0 "frame_elem_ptr" llvm.builder inignore (build_store v base llvm.builder);

where v is a function parameter called auxiliery and of type ptr.

The code above produces this IR:

  %frame = type { ptr }  %frame_ptr = alloca %frame, align 8  %frame_elem_ptr = getelementptr inbounds %frame, %frame* %frame_ptr, i32 0, i32 0  store ptr %auxiliary, ptr* %frame_elem_ptr, align 8

When I try to compile this I get:

llc-15: error: llc-15: llvm_ir.ll:54:28: error: ptr* is invalid - use ptr instead

Which kiiind of makes sense to me...I mean of course, I understand that the asterisk must be removed and if I manually remove it from the IR file it should compile (and it does actually!) but :

1. Why is this not allowed? (A pointer to a pointer is fine in C)
2. And most importantly, does anyone have any idea how could I fix it in my Ocaml code (or even C++ api instructions will be much appreciated!) ?

Generally, opaque pointers have caused me more trouble than good... :(