From 62d54203dc96486a6d3098b947cee8666a0eca0a Mon Sep 17 00:00:00 2001
From: Sharlatan Hellseher <sharlatanus@gmail.com>
Date: Fri, 2 Jan 2026 11:44:57 +0000
Subject: [PATCH] gnu: Add qdldl.

* gnu/packages/maths.scm (qdldl): New variable.

Change-Id: Ic43b3a4e6af342748367e93f22f37efea4b923f6
Signed-off-by: Rutherther <rutherther@ditigal.xyz>
---
 gnu/packages/maths.scm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index e7e06e90e008f5cd710252247d831a3a36cb82a1..a5b7c18f3b7e63ad053ec37735a077c0d30cddc1 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -406,6 +406,31 @@ programming languages.")
     (home-page "https://stcorp.nl/coda")
     (license license:gpl2+)))
 
+(define-public qdldl
+  (package
+    (name "qdldl")
+    (version "0.1.9")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+              (url "https://github.com/osqp/qdldl")
+              (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0vm9a51ar5kz4lmz01ydkk757ppzjnxy49rjbm56rwj65smp26d5"))))
+    (build-system cmake-build-system)
+    (arguments
+     (list #:configure-flags #~(list "-DQDLDL_UNITTESTS=ON")))
+    (home-page "https://github.com/osqp/qdldl")
+    (synopsis "LDL factorisation routine")
+    (description
+     "This package provides a free
+@url{https://en.wikipedia.org/wiki/Cholesky_decomposition#LDL_decomposition,
+@acronym{LDL, Lower-Diagonal-Lower}} factorisation routine for quasi-definite
+linear systems: @code{Ax=b}.")
+    (license license:asl2.0)))
+
 (define-public qhull
   (package
     (name "qhull")