dev/multiarch: Add FS hierarchy implementation

1 files changed, 21 insertions, 0 deletions

diff --git a/dev/multiarch.mdwn b/dev/multiarch.mdwn
index c9aa90b..d869a7d 100644
--- a/dev/multiarch.mdwn
+++ b/dev/multiarch.mdwn
@@ -157,3 +157,24 @@ dependency is available in the downloaded feed lists, and the dependency is not
 architecture-qualified.  The language extension dependency in turn depends on a
 language interpreter, which is also not architecture-qualified.  The native
 architecture of both will be installed.
+
+
+Implementation
+==============
+
+File System Hierarchy
+---------------------
+
+As explained above, to be coninstallable, library packages must install all of
+their files in architecture-qualified locations.  Debian and Ubuntu install
+shared object files in `/usr/lib/<triplet>` or `/lib/<triplet>`, where
+`<triplet>` is a [GNU system type][ac-systemtype].  Since multiple ProteanOS
+architectures may share the same GNU system type, ProteanOS architecture names
+are instead used in such library directories.
+
+ProteanOS's GNU Binutils and GCC packages have been patched and configured to
+use multiarch library paths since their initial releases in 2014.  opkhelper has
+used multiarch library paths when configuring packages since version 3.0.0-beta1
+released in 2012.
+
+[ac-systemtype]: https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/System-Type.html