Hi,

I’m relatively new to Julia. I’ve been using it to prototype some linear algebra methods. I now have need for some LAPACK methods which are not included in `LinearAlgebra.LAPACK`

, (specifically `dtpqrt`

and `dtpmqrt`

). I think I must be missing something basic, because even just copying an existing binding isn’t working.

Here is a minimal example, which I’ve tried in both 1.6 and 1.7:

```
using LinearAlgebra
using LinearAlgebra: BlasInt, require_one_based_indexing
using LinearAlgebra.LAPACK: liblapack, chkstride1, chklapackerror
using LinearAlgebra.BLAS: @blasfunc
function geqrt!(A::AbstractMatrix{Float64}, T::AbstractMatrix{Float64})
require_one_based_indexing(A, T)
chkstride1(A)
m, n = size(A)
minmn = min(m, n)
nb = size(T, 1)
if nb > minmn
throw(ArgumentError("block size $nb > $minmn too large"))
end
lda = max(1, stride(A,2))
work = Vector{Float64}(undef, nb*n)
if n > 0
info = Ref{BlasInt}()
ccall((@blasfunc(:dgeqrt_), liblapack), Cvoid,
(Ref{BlasInt}, Ref{BlasInt}, Ref{BlasInt}, Ptr{Float64},
Ref{BlasInt}, Ptr{Float64}, Ref{BlasInt}, Ptr{Float64},
Ptr{BlasInt}),
m, n, nb, A,
lda, T, max(1,stride(T,2)), work,
info)
chklapackerror(info[])
end
A, T
end
```

Calling this gives

```
ERROR: could not load symbol ":dgeqrt_64_":
dlsym(0x7fb7a1d04d50, :dgeqrt_64_): symbol not found
```

Thanks in advance for any assistance.