Hi,

Another idea for a new category: dev-build.  Proposed description:

  Build systems and related tools.

Some candidates (there are more):

dev-util/bazel
dev-util/cmake
dev-util/cmake-fedora
dev-util/gn
dev-util/gtk-doc-am
dev-util/gyp
dev-util/meson
dev-util/muon
dev-util/netsurf-buildsystem
dev-util/ninja
dev-util/samurai
dev-util/tup
sys-devel/autoconf*
sys-devel/automake*
sys-devel/bmake
sys-devel/cons
sys-devel/gettext (not 100% sure about it)
sys-devel/libtool
sys-devel/make
sys-devel/pmake
sys-devel/qconf
sys-devel/slibtool

-- 
Best regards,
Michał Górny