pre-v1.9 version

Author: ChrisRackauckas

src/factorization.jl

@@ -10,7 +10,12 @@ end
     function _ldiv!(x::AbstractVector, A::SparseArrays.SPQR.QRSparse, b::AbstractVector)
         x .= A \ b
     end
+else
+    function _ldiv!(x::AbstractVector, A::SuiteSparse.SPQR.QRSparse, b::AbstractVector)
+        x .= A \ b
+    end
 end
+
 function SciMLBase.solve(cache::LinearCache, alg::AbstractFactorization; kwargs...)
     if cache.isfresh
         fact = do_factorization(alg, cache.A, cache.b, cache.u)