qcad can't read/import DXF files.

["John D. Baker" <jdbaker%consolidated.net@localhost>]

Firing up the latest QCad from pkgsrc-2019Q3, I was dismayed to learn
that it can't read DXF files (created with earlier versions of QCad).

It complains:

RFileImporterRegistry.cpp:85, static RFileImporter* RFileImporterRegistry::getFileImporter(const QString&, const QString&, RDocument&, RMessageHandler*, RProgressHandler*):
Warning:  RFileImporterRegistry::getFileImporter: No suitable importer found for 
 "/home/jdbaker/prj/qcad/bbb-net4501-template.dxf"
RDocumentInterface.cpp:1236, RDocumentInterface::IoErrorCode RDocumentInterface::importFile(const QString&, const QString&, bool):
Warning:  "No file importer found for file /home/jdbaker/prj/qcad/bbb-net4501-template.dxf"


Messages on the terminal where I launched it indicate:

[...]
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:07:55: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:07:59: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:07:59: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:00: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:04: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:04: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:04: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:05: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:06: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:06: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:06: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
RPluginLoader.cpp:68, static QStringList RPluginLoader::getPluginFiles():
10:08:06: Debug:    Ignoring release plugin built in debug mode:  "libqcaddxf.so"
[...]

How to fix?

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