I have completed what I wanted to achieve for the new overlay and have uploaded it here: https://github.com/gentoo-dlang
Features include: * Installation of DMD, GDC and LDC in parallel * Customizable »CFLAGS« for each D compiler * GDC is integrated with GCC for the best compatibility * Slotted installation of previous D compiler versions * Shared library support when using DMD * Easily compile debug builds with DMD and release builds with LDC/GDC even when they depend on libraries like GtkD. (Note: This depends on availability of libraries in the repository.) Try e.g.: ACCEPT_KEYWORDS="~amd64" USE="ldc2-0.12.0" emerge GtkD -- Marco