From ec46d5abcf276480318c29211b432afa8ad27672 Mon Sep 17 00:00:00 2001
From: Ghislain Vaillant <ghislain.vaillant@inria.fr>
Date: Wed, 26 Aug 2026 14:23:16 +0200
Subject: hep: Add xfitter.

* guix-science/packages/hep.scm (xfitter): New variable.
---
 guix-science/packages/hep.scm | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/guix-science/packages/hep.scm b/guix-science/packages/hep.scm
index 6c56a3a..c22d166 100644
--- a/guix-science/packages/hep.scm
+++ b/guix-science/packages/hep.scm
@@ -1511,6 +1511,48 @@ level with the full top-quark and bottom-quark mass dependence in a generic two
 Higgs doublet model.")
     (license license:gpl2)))
 
+(define-public xfitter
+  (package
+    (name "xfitter")
+    (version "2.2.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://gitlab.cern.ch/fitters/xfitter.git")
+             (commit (string-append version "_Future_Freeze"))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0sxlahbabvry6rzgf07xr6sm45c1sx6s55g72204n13gay1g3af1"))))
+    (build-system cmake-build-system)
+    (arguments
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
+          (delete 'check)
+          (add-after 'install 'check
+            (lambda _
+              (let ((xfitter (string-append #$output "/bin/xfitter")))
+                (with-directory-excursion "../source/examples/defaultNNLO"
+                  (invoke xfitter))))))))
+    (inputs (list gsl
+                  openblas
+                  qcdnum
+                  root
+                  yaml-cpp
+                  zlib))
+    (native-inputs (list gfortran pkg-config))
+    (home-page "https://xfitter.hepforge.org/")
+    (synopsis "PDF fit program for HERA proton parton densities")
+    (description
+     "@code{xFitter} is an open source QCD fit framework desinged to extract
+PDFs and assess the impact of new data.  The @code{xFitter} project is is a
+common initiative by the H1 and ZEUS collaborations and extended to the LHC
+collaborations to provide precision QCD analyses.  xFitter has been used as one
+of the main software packages for the determination of the HERA proton parton
+densities, HERAPDFs.")
+    (license license:gpl3)))
+
 (define-public yoda
   (package
     (name "yoda")
-- 
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