From 293240470519966916a413e77f02a0c9c0603e26 Mon Sep 17 00:00:00 2001
From: Jesse Chan <jesse.lee.chan@gmail.com>
Date: Sat, 7 Oct 2023 11:25:05 -0400
Subject: [PATCH] revert back to Julia compat 1.7, add Requires

---
 Project.toml                                 |  2 +-
 ext/StartUpDGSummationByPartsOperatorsExt.jl | 17 ++++++++++++-----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/Project.toml b/Project.toml
index 4ef4b4e7..ab5a709f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -46,4 +46,4 @@ StaticArrays = "1"
 SummationByPartsOperators = "0.5"
 Triangulate = "2"
 WriteVTK = "1"
-julia = "1.9"
+julia = "1.7"
diff --git a/ext/StartUpDGSummationByPartsOperatorsExt.jl b/ext/StartUpDGSummationByPartsOperatorsExt.jl
index 919e738d..6b583463 100644
--- a/ext/StartUpDGSummationByPartsOperatorsExt.jl
+++ b/ext/StartUpDGSummationByPartsOperatorsExt.jl
@@ -5,11 +5,18 @@ module StartUpDGSummationByPartsOperatorsExt
 
     using StartUpDG
 
-    using SummationByPartsOperators
-    using SummationByPartsOperators: AbstractDerivativeOperator,
-                                     AbstractNonperiodicDerivativeOperator, DerivativeOperator,
-                                     AbstractPeriodicDerivativeOperator,
-                                     PeriodicDerivativeOperator, grid
+    # Required for visualization code
+    if isdefined(Base, :get_extension)
+        using SummationByPartsOperators: SummationByPartsOperators, DerivativeOperator, grid,
+                                         AbstractDerivativeOperator, AbstractNonperiodicDerivativeOperator, 
+                                         PeriodicDerivativeOperator, AbstractPeriodicDerivativeOperator
+    else
+        # Until Julia v1.9 is the minimum required version for Trixi.jl, we still support Requires.jl
+        using ..SummationByPartsOperators
+        using ..SummationByPartsOperators: AbstractDerivativeOperator, AbstractPeriodicDerivativeOperator,
+                                           AbstractNonperiodicDerivativeOperator, DerivativeOperator,                                         
+                                           PeriodicDerivativeOperator, grid
+    end