On OS X, the default file system is case insensitive (but case preserving). plasma-framework installs headers into $PREFIX/include/KF5/plasma and $PREFIX/include/Plasma, which end up being the same thing:

-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/applet.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/containment.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/containmentactions.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/corona.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/datacontainer.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/dataengine.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/dataengineconsumer.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/pluginloader.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/framesvg.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/package.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/packagestructure.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/service.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/servicejob.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/svg.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/theme.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/plasma.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/plasma_export.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/version.h
-- Up-to-date: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Applet
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/applet.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Containment
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/containment.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/ContainmentActions
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/containmentactions.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Corona
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/corona.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/DataContainer
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/datacontainer.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/DataEngine
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/dataengine.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/DataEngineConsumer
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/dataengineconsumer.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/FrameSvg
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/framesvg.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Package
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/package.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/PackageStructure
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/packagestructure.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Plasma
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/plasma.h
-- Up-to-date: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/plasma_export.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/PluginLoader
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/pluginloader.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Service
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/service.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/ServiceJob
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/servicejob.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Svg
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/svg.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/Theme
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/Plasma/theme.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/scripting/appletscript.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/scripting/dataenginescript.h
-- Installing: /sw/build.build/root-libkf5plasma5-shlibs-5.6.0-1/sw/lib/qt5-mac/include/KF5/plasma/scripting/scriptengine.h


Reproducible: Always


Actual Results:  
The headers from Plasma overwrite the headers from plasma, but preserve the lowercase folder name. Also, and perhaps related, the installed .h headers are broken:

$ cat /sw/lib/qt5-mac/include/KF5/plasma/applet.h
#include "/sw/build.build/libkf5plasma5-shlibs-5.6.0-1/plasma-framework-5.6.0/src/plasma/applet.h"

"/sw/build.build/libkf5plasma5-shlibs-5.6.0-1/" is the sandboxed build directory for the package and is deleted after a successful build and package creation. All the .h headers are broken and reference the temporary build directory except for version.h and plasma_export.h and the 3 KF5/plasma/scripting/*.h files.


Bug 342899 shows a similar problem with the kpackage framework (none of the other KF5 frameworks have this problem).