For better support of depending collections, it would be cool if scl-utils could provide some macro support for the idea bellow, to remove the repetitive work.


scl depending collections
-------------------------------------
- split %scl into %scl_name_base, %scl_name_version
- each metapackage has subpackage named "scldevel"
- this package is added into minimal buildroot by relengs
- this subpackage must contain macros.%{scl_name_base}-scldevel that must contain:

cat >> %{buildroot}%{_root_sysconfdir}/rpm/macros.%{scl_name_base}-scldevel << EOF
%%scl_%{scl_name_base} %{scl}
%%scl_prefix_%{scl_name_base} %{scl_prefix}
EOF

- the macros.%{scl_name_base}-scldevel files must conflict between all %{scl_name_base} collections. This disallows installation of multiple versions of %{scl_name_base} collections (e.g. ruby193-scldevel can't be installed side by side with ruby200-scldevel):

%package scldevel
Summary: Package shipping development files for %scl
%description scldevel
Package shipping development files, especially usefull for development of
packages depending on %scl Software Collection.


- Usage
Everything bellow belongs into metapackage of dependent collection

# This is optional. Can be replaced by %{?scl_prefix_ruby}. It is just hint,
# that the collection was designed with ruby200 in mind. If buildroot has no
# special settings (i.e. there is explicitely not available different -scldevel
# package), the BuildRequires pulls in ruby200-scldevel.
%{!?scl_ruby:%global scl_ruby ruby200}
%{!?scl_prefix_ruby:%global scl_prefix_ruby %{scl_ruby}-}

# Always BR -scldevel package. That way you ensure that -scldevel packag is in
# buildroot and the default values are actually not in use. When this package
# would be omitted, it might result in broken requires, which could be
# discoverred just by build of subsequent packages.
BuildRequires: %{scl_prefix_ruby}scldevel

%package runtime
Summary: Package that handles %scl Software Collection.
Requires: scl-utils
Requires: %{scl_prefix_ruby}runtime

%package build
Summary: Package shipping basic build configuration
# This ensures availability of macros in every package of collection.
Requires: %{scl_prefix_ruby}scldevel