Topic: WebKitGTK compilation from PKGBUILD requires manual intervention
When I tried compiling WebKitGTK from Hyperbola's PKGBUILD using only one process (replacing make with "make -j1") and with a sufficiently large swap file (6GB plus 2GB memory) the process terminates at around 97% with the error:
No rule to make target 'JavaScriptCore-4.0.gir'
See this bug report:
https://bugs.webkit.org/show_bug.cgi?id=195251
A simple dirty hack is to pause the compilation after it is done with the JavaScriptCore directory at around 39% using Ctrl+Z, go to the JavaScriptCore directory (by running "cd src/build/Source/JavaScriptCore/"), run make and then resume the building of the PKGBUILD using the "fg" command (it will no longer display the percentages but the compilation will finish successfully if you pause and resume occasionally to prevent shutdown due to overheating).
PS - I also tried running the PKGBUILD with "make -j2" and with "make -j1 JavaScriptCore-4-gir -C build" before "make -j1 -C build" but both of those also terminated with compilation errors.