* guide a lost camera_junk.h back home

* A few BUILDING.md tweaks.

* Update BUILDING.md

* Update BUILDING.md

---------

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

* Update BUILDING.md o2r & directory notes

* Update BUILDING.md

---------

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

Signed-off-by: Thomas Rohloff <v10lator@myway.de>

Signed-off-by: Thomas Rohloff <v10lator@myway.de>

-- Found Threads: TRUE
-- Found nlohmann_json: /usr/share/cmake/nlohmann_json/nlohmann_jsonConfig.cmake (found version "3.11.3")
-- Found Ogg: /usr/lib64/libogg.so (found version "1.3.5")
-- Found Vorbis: /usr/lib64/libvorbis.so (found version "1.3.7")
CMake Error at CMakeLists.txt:434 (find_package):
By not providing "FindSDL2_net.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "SDL2_net",
but CMake did not find one.

Could not find a package configuration file provided by "SDL2_net" with any
of the following names:

SDL2_netConfig.cmake
sdl2_net-config.cmake

Add the installation prefix of "SDL2_net" to CMAKE_PREFIX_PATH or set
"SDL2_net_DIR" to a directory containing one of the above files.  If
"SDL2_net" provides a separate development package or SDK, be sure it has
been installed.


-- Configuring incomplete, errors occurred!

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>