System information (version)

• OpenCV => 3.4.7 (but likely any version is affected)
• Operating System / Platform => Arch Linux as of 2020-07-29.
• Compiler => GCC 10.1

Detailed description

libjasper has recently changed jas_matrix_get from a macro to an inline function (commit 389951d07 @ https://github.com/jasper-software/jasper), causing the build to fail with error: lvalue required as unary ‘&’ operand.

This affects all OpenCV Versions from 2 to 4.

• for OpenCV 4, there's a fix at Fix build of grfmt_jpeg2000.cpp #17983
• for OpenCV 3, the patch is identical
• for OpenCV 2, the same patch works, but the file has a different path (located in highgui, not imgcodec).

Steps to reproduce

1. Build OpenCV against libjasper 2.0.19 (no earlier version)