Update LIBSOXR.md

LIBSOXR.md

@@ -3,28 +3,40 @@ The Raspbian image at the time of writing is the `May 2016` version, with the re
 
 Alternatively, `libsoxr` is very easy to compile. Here are very brief instructions to download, compile and install it:
 
-* Install `cmake`. This is used in the building of libsoxr:
+* Install `cmake`. This is used in the building of libsoxr. On Linuxes such as Debian/Ubuntu/Raspbian:
 ```
-sudo apt-get install cmake
+# apt-get install cmake
 ```
+On FreeBSD:
+```
+# pkg install cmake
+```
+
 * Download the `libsoxr source`:
 ```
-git clone git://git.code.sf.net/p/soxr/code libsoxr
+$ git clone git://git.code.sf.net/p/soxr/code libsoxr
 ```
 * `cd` into the `libsoxr` directory and start the build process:
 ```
-cd libsoxr
-./go
+$ cd libsoxr
+$ ./go
 ```
 Be patient! This takes a long time on a Raspberry Pi -- it looks like it gets stuck around 40% or 50%, but it will finish if you let it.
 
 Having compiled `libsoxr`, it must now must be installed:
 ```
-cd Release
-sudo make install
+$ cd Release
+# make install
 ```
-Finally, for Shairport Sync to be able to locate `libsoxr-dev` during compilation, you need to tell `ld` to catalogue it:
+Finally, for Shairport Sync to be able to locate `libsoxr` during compilation, you need to tell `ld` about it.  Be careful here if you are on FreeBSD -- the following instructions for Linux would mess up your FreeBSD system.
+
+On Linuxes such as Debian/Ubuntu/Raspbian: 
 ```
-sudo ldconfig -v
+# ldconfig -v
+```
+On FreeBSD you must add the location of the `soxr.pc` file to the `PKG_CONFIG_PATH`, if it exists, and define it otherwise. Here is what you do if it doesn't already exist:
+```
+$ PKG_CONFIG_PATH="/usr/local/lib/pkgconfig"
+$ export PKG_CONFIG_PATH
 ```
 That's it. Now you can select the `--with-soxr` option when you're building Shairport Sync.