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SAGA 7.9 PKGBUILD :

# Maintainer: Samuel Fernando Mesa Giraldo <samuelmesa@linuxmail.org>
# Maintainer: SaultDon <sault.don gmail>
# Contributor: Luigi Ranghetti <luigi.ranghetti@gmail.com>
# Contributor: Dominik Fuchs <dominik.fuchs@wur.nl>
# Contributor: Marcelo Avalos Tejeda <marcelo.avalos@gmail.com>

pkgname=saga-gis
_pkgname=saga
pkgver=7.9.0
pkgrel=1
pkgdesc="A Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis."
url="http://www.saga-gis.org"
license=("GPL3")
arch=('i686' 'x86_64')
depends=('wxgtk2'
         'proj' 'lua-hpdf'
         'gdal'
         'libtiff'
         'unixodbc'
         'jasper'
         'swig')
optdepends=('opencv3-opt'
            'vigra'
            'liblas'
            'libharu' 'libsvm')
source=("https://sourceforge.net/projects/saga-gis/files/SAGA - 7/SAGA - ${pkgver}/saga-${pkgver}.tar.gz")
md5sums=('b988d202508ea8387150d13ff9292fa5')

build() {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  autoreconf -i

  ./configure --prefix=/usr \
              --enable-shared \
              --enable-python PYTHON_VERSION=3 PYTHON=/usr/bin/python \
              --with-postgresql=/usr/bin/pg_config \
              --with-gdal=/usr/bin/gdal-config \
              CXXFLAGS="`wx-config --version=3.0 --cxxflags` -I/opt/opencv3/include/" \
              LIBS="`wx-config --version=3.0 --libs`" \
              LDFLAGS="-L/opt/opencv3/lib/"

  msg "Start compiling ..."
  make -j$(nproc)
}

package () {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  make DESTDIR="${pkgdir}" install

  install -Dm644 "${srcdir}/${_pkgname}-${pkgver}/src/saga_core/saga_gui/res/saga.png" \
                   "${pkgdir}/usr/share/pixmaps/${_pkgname}.png"
}

Use the following PKGBUILD with 7.8.1 version I'm in french as well ... type LANG=C in terminal before your command to avoid french words in output !

# Maintainer: Samuel Fernando Mesa Giraldo <samuelmesa@linuxmail.org>
# Maintainer: SaultDon <sault.don gmail>
# Contributor: Luigi Ranghetti <luigi.ranghetti@gmail.com>
# Contributor: Dominik Fuchs <dominik.fuchs@wur.nl>
# Contributor: Marcelo Avalos Tejeda <marcelo.avalos@gmail.com>

pkgname=saga-gis
_pkgname=saga
pkgver=7.8.1
pkgrel=1
pkgdesc="A Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis."
url="http://www.saga-gis.org"
license=("GPL3")
arch=('i686' 'x86_64')
depends=('wxgtk'
         'proj' 'lua-hpdf'
         'gdal'
         'libtiff'
         'unixodbc'
         'jasper'
         'swig')
optdepends=('opencv3-opt'
            'vigra'
            'liblas'
            'libharu' 'libsvm')
source=("https://sourceforge.net/projects/saga-gis/files/SAGA - 7/SAGA - ${pkgver}/saga-${pkgver}.tar.gz")
md5sums=('8f32ca8ee79c3fad1a8a76e6ae99e8fa')

build() {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  autoreconf -i

  ./configure --prefix=/usr \
              --enable-shared \
              --enable-python PYTHON_VERSION=3 PYTHON=/usr/bin/python \
              --with-postgresql=/usr/bin/pg_config \
              --with-gdal=/usr/bin/gdal-config \
              CXXFLAGS="`wx-config --version=3.0 --cxxflags` -I/opt/opencv3/include/" \
              LIBS="`wx-config --version=3.0 --libs`" \
              LDFLAGS="-L/opt/opencv3/lib/"

  msg "Start compiling ..."
  make -j$(nproc)
}

package () {
  cd "${srcdir}/${_pkgname}-${pkgver}"

  make DESTDIR="${pkgdir}" install

  install -Dm644 "${srcdir}/${_pkgname}-${pkgver}/src/saga_core/saga_gui/res/saga.png" \
                   "${pkgdir}/usr/share/pixmaps/${_pkgname}.png"
}

Hello there, compilation doesn't work for me. I tried installing opcv3-opt firt, but it didn't fix the problem.

opencv.cpp: Dans la fonction « bool Copy_Grid_To_CVMatrix(CSG_Grid*, cv::Mat*, bool) »:
opencv.cpp:113:28: erreur: conversion de « cv::Mat » vers le type non scalaire « CvMat » demandée
  113 |    CvMat Row = pMatrix->row(y);
      |                ~~~~~~~~~~~~^~~
opencv.cpp: Dans la fonction « bool Copy_CVMatrix_To_Grid(CSG_Grid*, cv::Mat*, bool) »:
opencv.cpp:147:28: erreur: conversion de « cv::Mat » vers le type non scalaire « CvMat » demandée
  147 |    CvMat Row = pMatrix->row(y);

This is where I get that having my computer in French won't help...

Unfortunately, I cannot install saga because the dependency lua-hpdf cannot be installed (see also the comments section of https://aur.archlinux.org/packages/lua-hpdf/).

Yes. I've managed to compile it after installing opencv3-opt

The package compiled for me after installing opencv3-opt (listed as an optional dependency)

Same here...

Having opencv errors:

opencv_ml.h:60:10: fatal error: opencv2/core/version.hpp: No such file or directory 60 | #include "opencv2/core/version.hpp" | ^~~~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. In file included from opencv_morphology.h:72, from opencv_morphology.cpp:61: opencv.h:75:10: fatal error: opencv/cv.h: No such file or directory 75 | #include <opencv/cv.h> | ^~~~~~~~~~~~~ compilation terminated. make[5]: *** [Makefile:555: opencv_morphology.lo] Error 1 In file included from opencv_stereo_match.h:72, from opencv_stereo_match.cpp:61:

Update version to 7.5.0 with fix opencv version

Same fatal error: opencv/cv.h: No such file or directory errors here.