From: Martin Wilck <[email protected]>

In the default configuration (both prefix and usr_prefix unset),
we'd install man pages and headers under /share/man and /include,
respectively, which is very unusual. Have usr_prefix default to
/usr in (the default) case where prefix is empty, and set it equal
to /prefix otherwise.

Signed-off-by: Martin Wilck <[email protected]>
---

This is submitted as an alternative approach to Ben Marzinski's
late patch set "Makefile cleanups."

---
 Makefile.inc | 2 +-
 README.md    | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/Makefile.inc b/Makefile.inc
index a20e2ce..6b45430 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -36,7 +36,7 @@ prefix                :=
 # Prefix for binaries
 exec_prefix    := $(prefix)
 # Prefix for non-essential libraries (libdmmp)
-usr_prefix     := $(prefix)
+usr_prefix     := $(if $(prefix),$(prefix),/usr)
 # Prefix for configfuration files (multipath.conf)
 etc_prefix     := $(prefix)
 # Where to install systemd-related files. systemd is usually installed under 
/usr
diff --git a/README.md b/README.md
index db03a33..d4f35f5 100644
--- a/README.md
+++ b/README.md
@@ -131,8 +131,7 @@ The following variables can be passed to the `make` command 
line:
    "Usr-merged" distributions[^systemd] may want to set this to `/usr`. The
    default is empty (`""`).
  * `usr_prefix`: where to install those parts of the code that aren't necessary
-   for booting. Non-usr-merged distributions[^systemd] may want to set this to
-   `/usr`. The default is `$(prefix)`.
+   for booting. The default is `/usr` if `$(prefix)` is empty, and `$(prefix)` 
otherwise.
  * `systemd_prefix`: Prefix for systemd-related files[^systemd]. The default 
is `/usr`.
  * `etc_prefix`: The prefix for configuration files. "usr-merged"
    distributions with immutable `/usr`[^systemd] may want to set this to
-- 
2.42.1


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