From: Cheng Li <shiptux@gmail.com>
Date: Tue, 18 Aug 2026 18:45:07 +0900
Subject: [PATCH] Build with LLVM 21

Crystal 1.18.2 supports LLVM 21.1. Switch the build dependencies from
LLVM 19 to LLVM 21 so llvm-toolchain-19 can be removed from the archive.

Bug-Debian: https://bugs.debian.org/1124047
---
 debian/control | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/debian/control b/debian/control
--- a/debian/control
+++ b/debian/control
@@ -15,8 +15,8 @@ Build-Depends: debhelper-compat (= 13),
                libxml2-dev,
                libyaml-dev,
                libz-dev,
-               lld-19,
-               llvm-19-dev,
+               lld-21,
+               llvm-21-dev,
                pkgconf,
                crystal (>= 1.6.0)
 Standards-Version: 4.7.2
