readme: update installation instructions and telle people to rerun cmake before insta...

diff --git a/README.md b/README.md
index b294bfefb6ad478ff4e871d032ce7431dcfcc2c8..9cbbde5c0c521ef95efbf9472b8dad03d723be6c 100644 (file)
--- a/README.md
+++ b/README.md
@@ -146,7 +146,7 @@ Run `./gamepacks-manager -h` to know about available licenses and other availabl
 options:
 
 * `FHS_INSTALL=ON`  
-  Install files following the Filesystem Hierarchy Standard (bin, lib, share, etc.), also setup XDG mime and application support on POSIX systems (default: `OFF`, install like in 1999)
+  Available for POSIX systems: install files following the Filesystem Hierarchy Standard (bin, lib, share, etc.), also setup XDG mime and application support on Linux-like systems (default: `OFF`, install like in 1999)
 * `CMAKE_INSTALL_PREFIX=/usr`  
   Install system-wide on Posix systems, always set `FHS_INSTALL` to `ON` when doing this (default: install in `install/` directory within source tree)
 
@@ -155,6 +155,12 @@ target:
 * `install`  
   Install files
 
+Note that because of both the way NetRadiant works and the way bundled library loading works CMake has to do some globbing to detect some of the produced/copied files it has to install. So you have to run cmake again before installing:
+
+```
+cmake -H. -Bbuild && cmake --build build -- install
+```
+
 ## Note about Crunch
 
 The crnlib used to decode `.crn` files is the one from [Dæmon](http://github.com/DaemonEngine/Daemon) which is the one by [Unity](https://github.com/Unity-Technologies/crunch/tree/unity) made cross-platform and slightly improved. Since Unity brokes compatibility with [BinomialLLC's legacy tree](https://github.com/BinomialLLC/crunch) it's required to use either the `crunch` tool from Dæmon or the one from Unity to compress textures that have to be read by radiant or q3map2.