From d4d4654d6325e92aff96523b64e1d403655a71cc Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Thu, 13 Oct 2022 16:05:03 +0200
Subject: [PATCH] Only load subscript package with LaTeX < 2005/12/01 (#12387)

---
 lib/chkconfig.ltx     | 2 ++
 src/LaTeXFeatures.cpp | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/chkconfig.ltx b/lib/chkconfig.ltx
index 3f5427c440..957ea22d08 100644
--- a/lib/chkconfig.ltx
+++ b/lib/chkconfig.ltx
@@ -235,6 +235,8 @@
 \AddVariable{fmtversion}{\fmtversion}
 
 %%% Crucial versions
+% This one introduces \textsubscript
+\TestLaTeXVersion{2005/12/01}
 % This one introduces path encoding changes
 \TestLaTeXVersion{2019/10/01}
 % This introduces all math and text spaces
diff --git a/src/LaTeXFeatures.cpp b/src/LaTeXFeatures.cpp
index ad50374d47..7e65c4280f 100644
--- a/src/LaTeXFeatures.cpp
+++ b/src/LaTeXFeatures.cpp
@@ -1511,7 +1511,8 @@ string const LaTeXFeatures::getPackages() const
 	}
 
 	// fixltx2e provides subscript
-	if (mustProvide("subscript") && !isRequired("fixltx2e"))
+	if (mustProvide("subscript") && !isRequired("fixltx2e")
+	    && !isAvailable("LaTeX-2005/12/01"))
 		packages << "\\usepackage{subscript}\n";
 
 	// footmisc must be loaded after setspace
-- 
2.39.5