Hello, when attempting to compile jdk/jdk on AIX with the recently released xlc16 / xlclang++ , I run into an issue with the compilation of hotspot/os/aix/porting_aix.cpp . The error is caused by the inclusion of demangle.h in porting_aix.cpp which leads to this error message : #error "Please include ibmdemangle.h for xlclang++ to demangle symbol names." However the inclusion of 'ibmdemangle.h' fails with : /jdk/src/hotspot/os/aix/porting_aix.cpp:39:10: fatal error: 'ibmdemangle.h' file not found #include <ibmdemangle.h> Does anyone know where 'ibmdemangle.h' should come from ? I cannot find it in the compiler installation of xlc16 . And it is also not in /usr/include . My current workaround is to disable the C++ name demangling in porting_aix.cpp . Thanks, Matthias