Read-Only File System on Mac (/usr/bin is write protected)

[dmitry-abt]

When following the instructions to install on a Mac (OS Monterey) (https://github.com/openstreetmap/mod_tile/blob/master/docs/build/building_on_macos.md), the following issue occurs (after running command sudo cmake --install . --prefix /usr --strip):

-- Install configuration: "Release"
-- Up-to-date: /var/cache/renderd/tiles
-- Installing: /var/run/renderd
-- Installing: /opt/local/etc/apache2/extra/httpd-tile.conf
-- Installing: /etc/renderd.conf
-- Installing: /opt/local/lib/apache2/modules/mod_tile.so
-- Installing: /usr/bin/render_expired
CMake Error at cmake_install.cmake:110 (file):
  file INSTALL cannot copy file "/tmp/mod_tile_build/src/render_expired" to
  "/usr/bin/render_expired": Read-only file system.

As I understand, Catalina (and other newer ones) has a new file system arrangement where most of the system files are write-protected. Apple uses two partitions, a read-only one for the main system files and a writeable one for other files, and melds them together and presents them as one to the user.

What can be done in this case?

[hummeltech]

Hello @dmitry-abt, I am seeing that too, I must have copied and pasted that line. I tested it out and have found that it successfully installs with this command:

sudo cmake --install --strip

The problem is that the prefix /usr seems to be write-protected in macOS, so installing to the default prefix /usr/local resolves this.

[hummeltech]

@dmitry-abt , let me know if that solves your issue, if so, we can close this issue. Thanks!