libcdio.texi: add information about the cdio/cdio_config.h and cdio_unconfig.hs header mess.

README.libcdio: revise for FreeBSD and other BSDs.

README.libcdio

@@ -2,7 +2,7 @@ See README.develop if you plan use the git or development version.
 
 0. To compile the source, you'll need a POSIX shell and utilities (sh,
 sed, grep, cat), an ANSI C compiler like gcc, and a POSIX "make"
-program like GNU make. You may also want to have "libtool" installed
+program like GNU make or remake. You may also want to have "libtool" installed
 for building portable shared libraries.
 
 1. Uncompress and unpack the source code using for example "tar". Recent
@@ -12,7 +12,7 @@ versions of GNU tar can do this in one step like this:
 2. Go into the directory, run "configure" followed by "make":
 
   cd libcdio-*
-  sh ./configure MAKE=make  # or gmake or remake
+  sh ./configure MAKE=make  # or remake or gmake
 
 3. If step 2 works, compile everything:
 
@@ -79,11 +79,12 @@ XBOX
 Consult the xboxmediacenter team (www.xboxmediacenter.de)
 
 
-BSD
+BSD, FreeBSD, NetBSD
 ---
 
 Unless you use --without-versioned-libs (not recommended), you need to
-use GNU make which usually can be found under the name "gmake".
+use GNU make or remake (http://bashdb.sf.net/remake). GNU make can be
+found under the name "gmake".
 
 If you use another make you are likely to get problems linking libcdio
 and libiso9660.