Running Slackware64-current and AlienBob's latest KDE 5 build. After the large batch of updates to -current (on 10.2.2017) I have, as anticipated, needed to rebuild some packages due to the upgrades. All has gone fine until I tried to build Digikam-5.4.0 today. It goes roughly 73% completion and then fails on an error.

In the output I am seeing many, many references like this in the output from AlienBob's checkpkg.sh script run on the build log. - (see http://pastebin.com/qVh7CiTD for all)

19238: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::BrowserContextAdapter::httpCacheMaxSize() const@Qt_5'
19239: /usr/lib64/libQt5WebEngineWidgets.so.5: undefined reference to `QtWebEngineCore::FilePickerController::rejected()@Qt_5'
19240: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::WebContentsAdapter::getNavigationEntryIconUrl(int)@Qt_5'
19241: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::UserScript::name() const@Qt_5'
19242: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::WebContentsAdapter::browserContext()@Qt_5'
19243: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::WebContentsAdapter::getNavigationEntryTitle(int)@Qt_5'
19244: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::JavaScriptDialogController::title() const@Qt_5'
19245: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::WebContentsAdapter::hasInspector() const@Qt_5'
19246: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::WebContentsAdapter::isAudioMuted() const@Qt_5'
19247: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::JavaScriptDialogController::reject()@Qt_5'
19248: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::UserScript::~UserScript()@Qt_5'
19249: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::JavaScriptDialogController::type() const@Qt_5'
19250: /usr/lib64/libQt5WebEngineWidgets.so.5: undefined reference to `QtWebEngineCore::UserResourceControllerHost::reserve(QtWebEngineCore::WebContentsAdapter*, int)@Qt_5'
19251: /usr/lib64/libQt5WebEngineWidgets.so.5: undefined reference to `QtWebEngineCore::FilePickerController::accepted(QStringList const&)@Qt_5'
19252: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::FaviconManager::getIcon(QUrl const&) const@Qt_5'
19253: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::WebContentsAdapter::getNavigationEntryUrl(int)@Qt_5'
19254: /usr/lib64/libQt5WebEngineWidgets.so.5: undefined reference to `QtWebEngineCore::WebEngineSettings::setFontSize(QtWebEngineCore::WebEngineSettings::FontSize, int)@Qt_5'
19255: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::UserScript::UserScript()@Qt_5'
19256: /usr/lib64/libQt5WebEngine.so.5: undefined reference to `QtWebEngineCore::AuthenticationDialogController::reject()@Qt_5

Clearly something amiss with /usr/lib64/libQt5WebEngine.so.5. Does anyone have any helpful comments?? Thank you in advance.

It looks like you didn't install the development packages that are related to /usr/lib64/libQt5WebEngine.so.5 as the header files would have defined these things that are undefined if you had. You will need to research what package /usr/lib64/libQt5WebEngine.so.5 comes with and find the dev or devel package then install it and the problem should be resolved.

I just tried to build Qt-5.7.1 using AlienBob's scripts and that is a no to too. Worked fine before the last updates to current. Will have to look in detail at what changed. Lots of requirements seem to now be missing -

./check_package.sh -l build.txt
++ Checking logfile 'build.txt' (no news is good news):
225: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
238: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
246: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
365: dlopen.cpp.text.startup+0x9): undefined reference to `dlopen'
366: collect2: error: ld returned 1 exit status
367: gmake: *** [Makefile:87: dlopen] Error 1
375: db2.cpp:40:20: fatal error: sqlcli.h: No such file or directory
377: gmake: *** [Makefile:183: db2.o] Error 1
381: ibase.cpp:40:19: fatal error: ibase.h: No such file or directory
383: gmake: *** [Makefile:183: ibase.o] Error 1
391: oci.cpp:40:17: fatal error: oci.h: No such file or directory
393: gmake: *** [Makefile:183: oci.o] Error 1
398: /usr/lib64/gcc/x86_64-slackware-linux/5.4.0/../../../../x86_64-slackware-linux/bin/ld: cannot find -lodbc
399: collect2: error: ld returned 1 exit status
400: gmake: *** [Makefile:87: odbc] Error 1
408: psql.cpp:40:22: fatal error: libpq-fe.h: No such file or directory
410: gmake: *** [Makefile:183: psql.o] Error 1
418: sqlite2.cpp:40:20: fatal error: sqlite.h: No such file or directory
420: gmake: *** [Makefile:183: sqlite2.o] Error 1
424: tds.cpp:40:22: fatal error: sybfront.h: No such file or directory
426: gmake: *** [Makefile:183: tds.o] Error 1
506: tslib.cpp:40:19: fatal error: tslib.h: No such file or directory
508: gmake: *** [Makefile:183: tslib.o] Error 1
611: Project ERROR: mirclient development package not found
627: eglfs-brcm.cpp:42:22: fatal error: bcm_host.h: No such file or directory
629: gmake: *** [Makefile:183: eglfs-brcm.o] Error 1
650: eglfs-mali.cpp:40:30: fatal error: EGL/fbdev_window.h: No such file or directory
652: gmake: *** [Makefile:183: eglfs-mali.o] Error 1
657: eglfs-mali-2.cpp:47:5: error: ‘mali_native_window’ was not declared in this scope
660: eglfs-mali-2.cpp:47:25: error: ‘w’ was not declared in this scope
663: gmake: *** [Makefile:183: eglfs-mali-2.o] Error 1
667: eglfs-viv.cpp:41:28: fatal error: EGL/eglvivante.h: No such file or directory
669: gmake: *** [Makefile:183: eglfs-viv.o] Error 1
673: doubleconversion.cpp:40:49: fatal error: double-conversion/double-conversion.h: No such file or directory
675: gmake: *** [Makefile:183: doubleconversion.o] Error 1
758: ppoll.cpp:55:34: error: ‘nullptr’ was not declared in this scope
761: gmake: *** [Makefile:183: ppoll.o] Error 1
769: pollts.cpp:56:12: error: ‘:ollts’ has not been declared
772: pollts.cpp:56:35: error: ‘nullptr’ was not declared in this scope
775: gmake: *** [Makefile:183: pollts.o] Error 1
791: openvg.cpp:46:23: fatal error: VG/openvg.h: No such file or directory
793: gmake: *** [Makefile:183: openvg.o] Error 1
797: openvg.cpp:46:23: fatal error: VG/openvg.h: No such file or directory
799: gmake: *** [Makefile:183: openvg.o] Error 1
803: openvg.cpp:44:23: fatal error: vg/openvg.h: No such file or directory
805: gmake: *** [Makefile:183: openvg.o] Error 1
809: openvg.cpp:44:23: fatal error: vg/openvg.h: No such file or directory
811: gmake: *** [Makefile:183: openvg.o] Error 1
1059: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
1072: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
1080: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
1277: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
1290: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
1298: lastError = QT_READDIR_R(dir, mt_file.data(), &dirEntry);
12042: System jsoncpp not found. Using Chromium's copy.
12043: System protobuf not found. Using Chromium's copy.
12044: Compatible system libvpx not found.

More after this. Will keep digging.