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@MichaelChou, that depends on the amount of obligations tied to this title ;). But since I'm likely going to use this PKGBUILD (as a dependency of ROS) in the future, I guess this might be useful. Feel free to contact me by mail (see my AUR profile) :).

BTW, OpenCV has fixed this in their 3.4 branch (https://github.com/opencv/opencv/pull/17983), the next release should be fine again.

@Windfisch, thanks for your excellent work!

I've updated the PKGBUILD to include your patch. Also updated OpenCV to v3.4.11, cleaned up deprecated workarounds which are not needed anymore.

@Windfisch, would you like me to add you in the co-maintainer list of this package? No pressure though.

Due to a recent libjasper update, the build of this package fails.

For details, please refer to the upstream issue https://github.com/opencv/opencv/issues/17984

Until the patch has been accepted into OpenCV 3, here's a workaround by adding the patch to the PKGBUILD: https://github.com/Windfisch/pkgbuild-opencv3-opt

@MichaelChou, could you please update the PKGBUILD accordingly :)?

fixed by a workaround, until upstream (tbb) fixed

I had the same stdlib.h error, @crnchbng's solution worked for me.

I had to add the 2 following lines

-DCMAKE_NO_SYSTEM_FROM_IMPORTED=ON \
-DENABLE_PRECOMPILED_HEADERS=OFF \

I can confirm that the package compiled after adding

-DCMAKE_NO_SYSTEM_FROM_IMPORTED=ON

That was the exact same problem I was facing. I reverted my change and the problem appeared again.

I will include my patch here, so that if anyone wants to try it they can reproduce my exact change

From c751af1d46b03f232ed39e11b7b63179b7f7034e Mon Sep 17 00:00:00 2001
From: Daniel Reuter <***>
Date: Sun, 20 Oct 2019 13:34:42 +0200
Subject: [PATCH] fixed compilation

---
 PKGBUILD | 1 +
 1 file changed, 1 insertion(+)

diff --git a/PKGBUILD b/PKGBUILD
index 15bf3d7..858dcb5 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -36,6 +36,7 @@ build() {
     -DWITH_TBB=ON \
     -DOpenGL_GL_PREFERENCE=GLVND \
     -DBUILD_WITH_DEBUG_INFO=OFF \
+    -DCMAKE_NO_SYSTEM_FROM_IMPORTED=ON \
     -DBUILD_TESTS=OFF \
     -DBUILD_PERF_TESTS=OFF \
     -DBUILD_EXAMPLES=OFF \
--
2.23.0

It might very well be, that I just got lucky with the include order produced by this, as hinted at in the previous comment.

@crnchbng's fix works

I have also had issues building this package. For me the error occurred at:

Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/arithm.cpp.o

In file included from /usr/include/c++/9.2.0/ext/string_conversions.h:41,

             from /usr/include/c++/9.2.0/bits/basic_string.h:6493,

             from /usr/include/c++/9.2.0/string:55,

             from /usr/include/c++/9.2.0/stdexcept:39,

             from /usr/include/c++/9.2.0/array:39,

             from ~/.cache/yay/opencv3-opt/src/opencv-3.4.7/modules/core/include/opencv2/core/cvdef.h:594,

             from ~/.cache/yay/opencv3-opt/src/opencv-3.4.7/modules/core/include/opencv2/core.hpp:52,

             from ~/.cache/yay/opencv3-opt/src/opencv-3.4.7/modules/core/include/opencv2/core/utility.hpp:56,

             from ~/.cache/yay/opencv3-opt/src/opencv-3.4.7/modules/core/src/precomp.hpp:49,

             from ~/.cache/yay/opencv3-opt/src/opencv-3.4.7/modules/core/src/alloc.cpp:43:

/usr/include/c++/9.2.0/cstdlib:75:15: fatal error: stdlib.h: No such file or directory 75 | #include_next <stdlib.h> | ^~~~~~~~~~ compilation terminated.

stdlib.h exists in this directory, so I am unsure why this causes the compilation to terminate, however the fix submitted by @dreuter does not seem to help.