From ee71bbc2f7eeffccd422011c5e4dd503a8feebcb Mon Sep 17 00:00:00 2001
From: LeixB <abone9999@gmail.com>
Date: Wed, 15 Mar 2023 13:49:00 +0100
Subject: [PATCH] libsvm: 3.25 -> 3.31

---
 pkgs/development/libraries/libsvm/default.nix | 56 ++++++++++++-------
 .../development/libraries/libsvm/openmp.patch | 13 +++++
 2 files changed, 49 insertions(+), 20 deletions(-)
 create mode 100644 pkgs/development/libraries/libsvm/openmp.patch

diff --git a/pkgs/development/libraries/libsvm/default.nix b/pkgs/development/libraries/libsvm/default.nix
index fbc9bc4d331..e1f1830b134 100644
--- a/pkgs/development/libraries/libsvm/default.nix
+++ b/pkgs/development/libraries/libsvm/default.nix
@@ -1,33 +1,49 @@
-{lib, stdenv, fetchurl}:
+{ lib
+, stdenv
+, fetchurl
+, fixDarwinDylibNames
+, llvmPackages
+, withOpenMP ? true
+}:
 
 stdenv.mkDerivation rec {
   pname = "libsvm";
-  version = "3.25";
+  version = "3.31";
 
   src = fetchurl {
     url = "https://www.csie.ntu.edu.tw/~cjlin/libsvm/libsvm-${version}.tar.gz";
-    sha256 = "sha256-UjUOiqdAsXbh13Pp3AjxNAIYw34BvsN6uQ2wEn5LteU=";
+    sha256 = "sha256-AKtWH0jfX8kqhCCa2P5Rmery5Rmzwnm6z8k1l4p1zx8=";
   };
 
-  buildPhase = ''
-    make
-    make lib
-  '';
+  patches = lib.optionals withOpenMP [ ./openmp.patch ];
 
-  installPhase = let
-    libSuff = stdenv.hostPlatform.extensions.sharedLibrary;
-  in ''
-    install -D libsvm.so.2 $out/lib/libsvm.2${libSuff}
-    ln -s $out/lib/libsvm.2${libSuff} $out/lib/libsvm${libSuff}
-    install -Dt $out/bin/ svm-scale svm-train svm-predict
-    install -Dm644 -t $out/include svm.h
-    mkdir $out/include/libsvm
-    ln -s $out/include/svm.h $out/include/libsvm/svm.h
-  '';
+  buildInputs = lib.optionals (stdenv.cc.isClang && withOpenMP) [ llvmPackages.openmp ];
 
-  postFixup = lib.optionalString stdenv.isDarwin ''
-    install_name_tool -id libsvm.2.dylib $out/lib/libsvm.2.dylib;
-  '';
+  buildFlags = [ "lib" "all" ];
+
+  outputs = [ "out" "bin" "dev" ];
+
+  nativeBuildInputs = lib.optionals stdenv.isDarwin [ fixDarwinDylibNames ];
+
+  installPhase =
+    let
+      libSuff = stdenv.hostPlatform.extensions.sharedLibrary;
+      soVersion = "3";
+    in
+    ''
+      runHook preInstall
+
+      install -D libsvm.so.${soVersion} $out/lib/libsvm.${soVersion}${libSuff}
+      ln -s $out/lib/libsvm.${soVersion}${libSuff} $out/lib/libsvm${libSuff}
+
+      install -Dt $bin/bin/ svm-scale svm-train svm-predict
+
+      install -Dm644 -t $dev/include svm.h
+      mkdir $dev/include/libsvm
+      ln -s $dev/include/svm.h $dev/include/libsvm/svm.h
+
+      runHook postInstall
+    '';
 
   meta = with lib; {
     description = "A library for support vector machines";
diff --git a/pkgs/development/libraries/libsvm/openmp.patch b/pkgs/development/libraries/libsvm/openmp.patch
new file mode 100644
index 00000000000..b48fbae1f43
--- /dev/null
+++ b/pkgs/development/libraries/libsvm/openmp.patch
@@ -0,0 +1,13 @@
+--- /Makefile	1970-01-01 01:00:01.000000000 +0100
++++ /Makefile	1970-01-01 01:00:01.000000000 +0100
+@@ -9,8 +9,8 @@
+ endif
+ 
+ # Uncomment the following lines to enable parallelization with OpenMP
+-# CFLAGS += -fopenmp
+-# SHARED_LIB_FLAG += -fopenmp
++CFLAGS += -fopenmp
++SHARED_LIB_FLAG += -fopenmp
+ 
+ all: svm-train svm-predict svm-scale
+