version gate it?

Author: ChrisRackauckas

src/factorization.jl

@@ -6,10 +6,11 @@ function _ldiv!(x::Vector, A::Factorization, b::Vector)
     ldiv!(A, x)
 end
 
-function _ldiv!(x::AbstractVector, A::SparseArrays.SPQR.QRSparse, b::AbstractVector)
-    x .= A \ b
+@static if VERSION >= v"1.9-"
+    function _ldiv!(x::AbstractVector, A::SparseArrays.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)