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Some plugins (mainly render ones like SSAO) won't work with new cmake build system, will try to port qmake patches to cmake and fix those.

Please report issues and patches to github.com/AUR-meshlab

I used pacman to install eigen:

sudo pacman -Syu eigen

But, I was still getting an error that eigen3 was missing:

$ makepkg -sir
==> Making package: meshlab 2020.06-1 (Thu 02 Jul 2020 01:16:09 PM PDT)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Installing missing dependencies...
error: target not found: eigen3
==> ERROR: 'pacman' failed to install missing dependencies.
==> Missing dependencies:
  -> eigen3
==> ERROR: Could not resolve all dependencies.

So I changed "eigen3" to "eigen" in "makedepends" to get it working:

$ git diff PKGBUILD
diff --git a/PKGBUILD b/PKGBUILD
index 55b2e73..de27d91 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -8,7 +8,7 @@ arch=('i686' 'x86_64')
 url="http://www.meshlab.net"
 license=('GPL2')
 depends=('bzip2' 'glew' 'glu' 'openssl-1.0' 'qt5-base' 'qt5-declarative' 'qt5-script' 'qt5-xmlpatterns')
-makedepends=('cmake' 'eigen3' 'ninja' 'git' 'muparser' 'levmar' 'lib3ds' 'mpir')
+makedepends=('cmake' 'eigen' 'ninja' 'git' 'muparser' 'levmar' 'lib3ds' 'mpir')
 optdepends=('u3d: for U3D and IDTF file support'
             'lib3ds: for Autodesk`s 3D-Studio r3 and r4 .3DS file support'
             'levmar: for isoparametrization and mutualcorrs plugins'

@daren, I've made some adjustment to ninja call. But at the end I have to find a way to recreate options=(!makeflags) like behavior for ninja, as in contrast to make it starts nproc+2 build jobs by default where make starts single one...

Hey! Thanks for maintaining this.

Would you drop gcc10.patch from here? It doesn't apply anymore, since the upstream has already merged your GCC 10 fix.

Could you remove the MAKEFLAGS from the ninja line?

I put VERBOSE=1 in my MAKEFLAGS to see all the flags during compilation and this just breaks:

-- Build files have been written to: /build/meshlab/src/build
ninja: Entering directory `/build/meshlab/src/build'
ninja: error: unknown target 'VERBOSE=1'

Either edit the MAKEFLAGS before using it with make or don't mix it with this ninja shenanigans at all.

Some plugins (mainly render ones like SSAO) won't work with new cmake build system, will try to port qmake patches to cmake and fix those.

fakepkg is not a official tool

tested in chroot (systemd-npawn) and makepkg

EDIT: fixed with

sed '1i#include <climits>' -i meshlab/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.h

in prepare(). also need more workground for build with Qt5.15 from [kde-unstable], like

sed '1i#include <QPainterPath>' -i meshlab/src/meshlab/glarea.cpp

greetings

@sl1pkn07: Can't reproduce with either gcc:9.2/9.3. Could you please check if clean chroot build works fine for you?

mkdir -p /tmp/clean
sudo mount -t tmpfs -o suid tmpfs /tmp/clean
fakepkg levmar f2c lib3ds mpir muparser -o /tmp/clean -j $(nproc)
extra-x86_64-build -c -r /tmp/clean/ -- $(printf -- "-I %s " /tmp/clean/*pkg*)

2020.04.r7.g3e89ebb8d not fix the error in the comment below

FAILED: CMakeFiles/external-ssynth.dir/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.cpp.o 
/usr/bin/c++  -DMESHLAB_SCALAR=float -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_SCRIPT_LIB -DQT_WIDGETS_LIB -DQT_XML_LIB -Iexternal-ssynth_autogen/include -I/tmp/makepkg/meshlab-git/src/meshlab/vcglib -I/tmp/makepkg/meshlab-git/src/meshlab/src -I/usr/include/eigen3 -isystem /tmp/makepkg/meshlab-git/src/meshlab/src/external/structuresynth-1.5/ssynth -isystem /usr/include/qt -isystem /usr/include/qt/QtCore -isystem /usr/lib/qt/mkspecs/linux-g++ -isystem /usr/include/qt/QtXml -isystem /usr/include/qt/QtOpenGL -isystem /usr/include/qt/QtWidgets -isystem /usr/include/qt/QtGui -isystem /usr/include/qt/QtScript -march=native -O2 -pipe -fno-plt -fPIC   -fPIC -MD -MT CMakeFiles/external-ssynth.dir/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.cpp.o -MF CMakeFiles/external-ssynth.dir/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.cpp.o.d -o CMakeFiles/external-ssynth.dir/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.cpp.o -c /tmp/makepkg/meshlab-git/src/meshlab/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.cpp
In file included from /tmp/makepkg/meshlab-git/src/meshlab/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.cpp:1:
/tmp/makepkg/meshlab-git/src/meshlab/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.h:28:35: error: 'ULONG_MAX' was not declared in this scope
   28 |    bool wait(unsigned long time = ULONG_MAX) { wcm.lock(); bool w = wc.wait(&wcm,time); wcm.unlock(); return w; }
      |                                   ^~~~~~~~~
/tmp/makepkg/meshlab-git/src/meshlab/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/AtomicCounter.h:5:1: note: 'ULONG_MAX' is defined in header '<climits>'; did you forget to '#include <climits>'?
    4 | #include <QWaitCondition>
  +++ |+#include <climits>
    5 | 
ninja: build stopped: subcommand failed.

@thgravo: [Fixed]