Add some clarifications re. building Mesa

Mostly as a pretext to stick a footnote.  There shall be margin notes
in this saga, so says I.

1 files changed, 11 insertions, 3 deletions

diff --git a/guides/sysadmin/machines/amdahl30/killing-time.org b/guides/sysadmin/machines/amdahl30/killing-time.org
index 835c26a..0b70791 100644
--- a/guides/sysadmin/machines/amdahl30/killing-time.org
+++ b/guides/sysadmin/machines/amdahl30/killing-time.org
@@ -241,9 +241,17 @@ not overwork it to death?
     - {{{narrator(10 false leads later)}}}
     - The factory@ announcements say Mesa was upgraded from 24.2.7 to
       24.3.0 in snapshot 20241124.  The Mesa docs explain how to test
-      "local" (uninstalled) builds (kudos!) so gave it a shot: a
-      freshly built 24.2.7 behaves exactly like the current version,
-      so no smoking gun there.
+      "local builds" (i.e. uninstalled; kudos![fn:mesa-builddeps]) so
+      gave it a shot: a freshly built 24.2.7 behaves exactly like the
+      current distro version (24.3.4), so no smoking gun there.
+
+[fn:mesa-builddeps] Took some trial-and-error to get a build going:
+~zypper source-install --build-deps-only Mesa~ did not cut it.
+Probably should have looked at Tumbleweed's spec file to get a
+matching build configuration; instead ~zypper install~'ed my way to
+victory - needed ~libclc llvm llvm-devel libLLVMSPIRVLib-devel clang
+clang-devel python3-ply rust rust-bindgen rust-cbindgen~.
+
 
 - In [[https://gitlab.freedesktop.org/upower/power-profiles-daemon/-/issues/164][upower/power-profiles-daemon#164]], @Nyan reports problematic iGPU
   capping; not convinced this is applicable though, given the reported