redefined data types in different packages - request for help

[Ryan Schmidt]

On Nov 9, 2013, at 20:19, Michael Dickens wrote:

> Using "-isystem ${prefix}/include" seems like a great solution to using CPATH; it seems to work all the way back to clang 2.9 and gcc 4.2, maybe further, while CPATH started with (I think) clang 2.9 -- I'll have to investigate using it for qt4-mac.
>  
> I use LIBRARY_PATH instead of setting LDFLAGS, which works with gcc 4.2 or newer, probably much older too, but only clang 3.0 or newer (again, I think).  I find no good flags such as -isystem to do libraries in this way. - MLD

MacPorts does already automatically set CPATH and LIBRARY_PATH for all ports in all phases. Not sure this was a good thing to have done since it’s not necessary when CPPFLAGS and LDFLAGS are set correctly, and you still need to set CPPFLAGS and LDFLAGS correctly for older compilers that don’t understand CPATH and LIBRARY_PATH.