From 3ce97879d09c5cbeba6fdc5ebd7525b127df18e0 Mon Sep 17 00:00:00 2001
From: Franklin Mathieu <franklinmathieu@gmail.com>
Date: Sat, 21 Oct 2017 01:36:26 +0100
Subject: [PATCH] cmake,bsd: Fix mandir to saner defaults. (#7417)

closes #7239

The old behaviour was to set CMAKE_INSTALL_MANDIR to /usr/local/man
when MANPREFIX wasn't defined. This caused mismatching installation
paths when the installation prefix wasn't /usr/local.

This fix explicitely checks that the prefix is /usr/local to change
the value of CMAKE_INSTALL_MANDIR, and uses the default behaviour
otherwise, as /usr/local is the exception rather than the norm
(as per man hier(7)).
---
 cmake/InstallHelpers.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmake/InstallHelpers.cmake b/cmake/InstallHelpers.cmake
index ca20ddf354..bebc0d0d17 100644
--- a/cmake/InstallHelpers.cmake
+++ b/cmake/InstallHelpers.cmake
@@ -2,8 +2,8 @@
 if(CMAKE_SYSTEM_NAME MATCHES "BSD" AND NOT DEFINED CMAKE_INSTALL_MANDIR)
   if(DEFINED ENV{MANPREFIX})
     set(CMAKE_INSTALL_MANDIR "$ENV{MANPREFIX}/man")
-  else()
-    set(CMAKE_INSTALL_MANDIR "/usr/local/man")
+  elseif(CMAKE_INSTALL_PREFIX MATCHES "^/usr/local$")
+    set(CMAKE_INSTALL_MANDIR "man")
   endif()
 endif()