libkexiv2: Could NOT find Exiv2: Found unsuitable version "..", but required is at least "0.21"

[ryandesign (Ryan Carsten Schmidt)]

​libkexiv2 doesn't build:

-- Could NOT find Exiv2: Found unsuitable version "..", but required is at least "0.21" (found /opt/local/lib/libexiv2.dylib)

-----------------------------------------------------------------------------
-- The following REQUIRED packages could NOT be located on your system.
-- You must install these packages before continuing.
-----------------------------------------------------------------------------
   * Exiv2 (0.21 or higher)  <http://www.exiv2.org>
     Required to build libkexiv2.

-----------------------------------------------------------------------------

CMake Error at /opt/local/share/apps/cmake/modules/MacroLogFeature.cmake:152 (MESSAGE):
  Exiting: Missing Requirements
Call Stack (most recent call first):
  CMakeLists.txt:139 (MACRO_DISPLAY_FEATURE_LOG)

[kencu (Ken)]

The previous exiv2 version seemingly satisfies the test, but the current exiv2 version does not. cmake can be mysterious sometimes. I reverted exiv2 until someone shows how to sort this out. I can't seem to find exactly where this test is happening.

[NicosPavlov]

This is because exiv2 moved the version information from one file to another, breaking the FindExiv2.cmake file (provided by kdelibs4). This can be fixed in kdelibs4 with the attached patch.

There are however other problems, as there have been some changes in the API of Exiv2 version 0.27, so that libkexiv2 does not build regardless of finding the library.

[Marius Schamschula <mschamschula@…>]

In dcbf39e2d920efc9b32f3718635f74286a26cf7f/macports-ports (master):

libkexiv2: fix build against exiv2 0.27

kdelibs4: fix cmake module for exiv2
Closes: #57803