osx cmake install can't create man folder

[AskAlexSharov]

after git pull

mkdir build
cd build
cmake ..
make install


-- Install configuration: "Release"
-- Installing: /usr/local/lib/libmdbx.dylib
-- Installing: /usr/local/include/mdbx.h
-- Installing: /usr/local/include/mdbx.h++
-- Installing: /usr/local/bin/mdbx_chk
-- Installing: /usr/local/bin/mdbx_stat
-- Installing: /usr/local/bin/mdbx_copy
-- Installing: /usr/local/bin/mdbx_dump
-- Installing: /usr/local/bin/mdbx_load
-- Installing: /usr/local/bin/mdbx_drop
CMake Error at cmake_install.cmake:121 (file):
  file cannot create directory: /usr/local/man/man1.  Maybe need
  administrative privileges.

I'm not sure, but I see ls /usr/share/man/man1 folder on OSX (/usr/share instead of /usr/local)

[erthink]

Basically it is default CMake behavior (depending of CMAKE_INSTALL_PREFIX), but I will try to use GNUInstallDirs on non-Windows platforms.

[erthink]

@AskAlexSharov, I've minimally fixed some things.
Please check if this fixed the problem in your case.

However, I do not intend to fix anything more in this way, even if the problem still exists.
Because this means that there a some problem is in CMake (in the GNUInstallDirs module), and/or the -D command-line option should be used to explicitly define a corresponding variables responsible for an install directories.

[AskAlexSharov]

It's fine to leave it as "wont fix" if workaround described here.
Tested - works.