The include statements in the subdirectories are wrong when the headers are installed since then the path /bar/include/log4qt is not in the compiler include path (and there is no need for it) - therefore use #include <log4qt/foo.h> which works during building and usage of the library.
The include statements in the subdirectories are wrong when the headers are installed since then the path /bar/include/log4qt is not in the compiler include path (and there is no need for it) - therefore use #include <log4qt/foo.h> which works during building and usage of the library.