4 files changed, 143 insertions, 3 deletions
diff --git a/sci-physics/reduze/Manifest b/sci-physics/reduze/Manifest
index b83b647d5cd7..d1d42971baeb 100644
--- a/sci-physics/reduze/Manifest
+++ b/sci-physics/reduze/Manifest
@@ -1 +1,2 @@
 DIST reduze-2.2.tar.gz 669858 BLAKE2B 52c48f5547055087dc2969fe5a7a42281519cf1d9a454a675ea54741f3d5912cd9b135816994241fa206585038d683ba5a3849308ff0403f1d3507ec9b77fe00 SHA512 ca4ed6f754fc75511b0916e8c2eea26a69e0e30c604a714af76995038a8e11dc3b129157bf1a170e639ea0fc39f9f5102bba4ad503874f044ac91855d9a95dab
+DIST reduze-2.4.tar.gz 671780 BLAKE2B f401c9b50df0801b0b3305a8b77c3fd3f82b7f36419f4b76a28994c4db1f1a267dc40f91b42ee11ec5c911f6fab0a39eaf9f5cb2e099aa08e6489cea05760795 SHA512 06d5fbd371a4c5e88b6b77ddab5231438dae288c58122a6060e09c525deecf013b664a016d916b10e29373cefbc1f13af708a0a71a1f8da4204a63074424f6c1
diff --git a/sci-physics/reduze/files/reduze-2.2-db.patch b/sci-physics/reduze/files/reduze-2.2-db.patch
index 671cd5565e0a..a43de911be7a 100644
--- a/sci-physics/reduze/files/reduze-2.2-db.patch
+++ b/sci-physics/reduze/files/reduze-2.2-db.patch
@@ -1,6 +1,6 @@
-diff -r -U2 reduze-2.2.orig/reduze/CMakeLists.txt reduze-2.2/reduze/CMakeLists.txt
---- reduze-2.2.orig/reduze/CMakeLists.txt	2017-11-17 14:11:58.000000000 +0700
-+++ reduze-2.2/reduze/CMakeLists.txt	2017-12-19 20:27:17.508528174 +0700
+diff -r -U2 a/reduze/CMakeLists.txt b/reduze/CMakeLists.txt
+--- a/reduze/CMakeLists.txt	2017-11-17 14:11:58.000000000 +0700
++++ b/reduze/CMakeLists.txt	2017-12-19 20:27:17.508528174 +0700
 @@ -84,9 +84,8 @@
  	message (STATUS "Building with Berkeley DB support")
  	find_path(DB_INCLUDE_PATH NAMES dbstl_common.h
diff --git a/sci-physics/reduze/files/reduze-2.4-cmake.patch b/sci-physics/reduze/files/reduze-2.4-cmake.patch
new file mode 100644
index 000000000000..d45af23374b5
--- /dev/null
+++ b/sci-physics/reduze/files/reduze-2.4-cmake.patch
@@ -0,0 +1,81 @@
+From a64b26c6e5c6c49e5842280a8690ec0d31832ce8 Mon Sep 17 00:00:00 2001
+From: Andreas Sturmlechner <asturm@gentoo.org>
+Date: Sun, 7 Mar 2021 18:20:11 +0100
+Subject: [PATCH] Use GNUInstallDirs, add ENABLE_EXAMPLES option
+
+---
+ CMakeLists.txt                  | 17 +++++++++++------
+ reduze/CMakeLists.txt           |  2 +-
+ tools/reduze1to2/CMakeLists.txt |  2 +-
+ 3 files changed, 13 insertions(+), 8 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e6207bd..a0cab4b 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -29,11 +29,10 @@
+ # - 'make package_source' creates the source tarball
+ # - 'make doc'            creates the source code documentation using Doxygen
+ 
+-message (STATUS "Configuring package Reduze")
+-cmake_minimum_required (VERSION 2.6)
++cmake_minimum_required (VERSION 2.8.12)
+ 
+ project (Reduze)
+-list (APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules")
++set (CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules")
+ include (GetGitRevisionDescription)
+ #git_describe_new (GIT_TAG)
+ git_describe(GIT_TAG)
+@@ -76,6 +75,9 @@ if (NOT HAVE_TUTORIAL_PDF)
+    message (FATAL_ERROR "File ${TUTORIAL_PDF} not found")
+ endif (NOT HAVE_TUTORIAL_PDF)
+ 
++include(GNUInstallDirs)
++
++option (ENABLE_EXAMPLES "Install tools, examples" ON)
+ 
+ # include configured file with git tag in source package
+ # NOTE1: make sure to build before pack (make; make package_source) !
+@@ -89,9 +91,12 @@ add_subdirectory ("reduze")
+ add_subdirectory ("tools/reduze1to2")
+ add_subdirectory ("check")
+ add_subdirectory ("doc/code")
+-install (FILES "doc/tutorial/reduze2-tutorial.pdf" DESTINATION share/reduze/tutorial)
+-install (FILES "tools/reduze-mma.m" DESTINATION share/reduze/tools)
+-install (DIRECTORY "example" DESTINATION share/reduze PATTERN ".git" EXCLUDE)
++install (FILES "doc/tutorial/reduze2-tutorial.pdf" DESTINATION ${CMAKE_INSTALL_DOCDIR})
++
++if (ENABLE_EXAMPLES)
++  install (FILES "tools/reduze-mma.m" DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
++  install (DIRECTORY "example" DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples PATTERN ".git" EXCLUDE)
++endif ()
+ 
+ include (CPack)
+ 
+diff --git a/reduze/CMakeLists.txt b/reduze/CMakeLists.txt
+index b296081..a76c307 100644
+--- a/reduze/CMakeLists.txt
++++ b/reduze/CMakeLists.txt
+@@ -201,5 +201,5 @@ target_link_libraries (reduze yaml-cpp)
+ # installation
+ #------------------------------------------------------------------------------
+ 
+-install (TARGETS reduze DESTINATION bin)
++install (TARGETS reduze DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+diff --git a/tools/reduze1to2/CMakeLists.txt b/tools/reduze1to2/CMakeLists.txt
+index d1d4bd5..4822910 100644
+--- a/tools/reduze1to2/CMakeLists.txt
++++ b/tools/reduze1to2/CMakeLists.txt
+@@ -9,6 +9,6 @@ add_executable (reduze1to2 ${reduze1to2_SOURCES})
+ 
+ set (CMAKE_CXX_FLAGS "-Wall -pedantic -Wno-long-long")
+ 
+-install (TARGETS reduze1to2 DESTINATION bin)
++install (TARGETS reduze1to2 DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ message (STATUS "Added build target 'reduze1to2'")
+-- 
+2.30.1
+
diff --git a/sci-physics/reduze/reduze-2.4.ebuild b/sci-physics/reduze/reduze-2.4.ebuild
new file mode 100644
index 000000000000..c7ea66e3ee54
--- /dev/null
+++ b/sci-physics/reduze/reduze-2.4.ebuild
@@ -0,0 +1,58 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="Program for reducing Feynman integrals"
+HOMEPAGE="https://reduze.hepforge.org/"
+SRC_URI="https://reduze.hepforge.org/download/${P}.tar.gz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="berkdb doc examples mpi"
+
+RDEPEND="
+	>=sci-mathematics/ginac-1.4.1
+	berkdb? ( sys-libs/db:6.0[cxx] )
+	mpi? ( virtual/mpi )"
+DEPEND="${RDEPEND}"
+BDEPEND="
+	virtual/pkgconfig
+	doc? ( app-doc/doxygen )"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-cmake.patch
+	"${FILESDIR}"/${PN}-2.2-db.patch
+)
+
+# remove bundled yaml-cpp
+# no: it does not build. is it patched?
+# sed -i -e '/add_subdirectory ("yaml")/d' CMakeLists.txt || die
+
+src_configure() {
+	local mycmakeargs=(
+		-DCMAKE_DISABLE_FIND_PACKAGE_Git=ON # no thanks
+		-DUSE_HASH_TABLE=ON
+		-DUSE_DATABASE=$(usex berkdb)
+		-DENABLE_EXAMPLES=$(usex examples)
+		-DUSE_MPI=$(usex mpi)
+	)
+	cmake_src_configure
+}
+
+src_compile() {
+	cmake_src_compile all $(usev doc)
+}
+
+src_test() {
+	cmake_build check
+	use mpi && cmake_build check_mpi
+}
+
+src_install() {
+	use doc && local HTML_DOCS+=( "${BUILD_DIR}"/doc/code/html/. )
+	cmake_src_install
+}