-Guile requires a few external packages and can optionally use a number
-of external packages such as `readline' when they are available.
-Guile expects to be able to find these packages in the default
-compiler setup, it does not try to make any special arrangements
-itself. For example, for the `readline' package, Guile expects to be
-able to find the include file <readline/readline.h>, without passing
-any special `-I' options to the compiler.
-
-If you installed an external package, and you used the --prefix
-installation option to install it somewhere else than /usr/local, you
-must arrange for your compiler to find it by default. If that
-compiler is gcc, one convenient way of making such arrangements is to
-use the --with-local-prefix option during installation, naming the
-same directory as you used in the --prefix option of the package. In
-particular, it is not good enough to use the same --prefix option when
-you install gcc and the package; you need to use the
---with-local-prefix option as well. See the gcc documentation for
-more details.
+Guile depends on the following external libraries.
+- libgmp
+- libiconv
+- libintl
+- libltdl
+- libunistring
+- libgc
+- libffi
+It will also use the libreadline library if it is available.
+
+There is a corresponding `--with-XXX-prefix' option for each of these
+libraries (except for libgc and libffi which use `pkg-config', see
+below) that you can use when invoking ./configure, if you have these
+libraries installed in a location other than the standard places (/usr
+and /usr/local).
+
+These options are provided by the Gnulib `havelib' module, and details
+of how they work are documented in `Searching for Libraries' in the
+Gnulib manual (http://www.gnu.org/software/gnulib/manual). The extent
+to which they work on a given OS depends on whether that OS supports
+encoding full library path names in executables (aka `rpath'). Also
+note that using these options, and hence hardcoding full library path
+names (where that is supported), makes it impossible to later move the
+built executables and libraries to an installation location other than
+the one that was specified at build time.
+
+Another possible approach is to set CPPFLAGS and LDFLAGS on the
+configure command-line, so that they include -I options for all the
+non-standard places where you have installed header files and -L
+options for all the non-standard places where you have installed
+libraries. This will allow configure and make to find those headers
+and libraries during the build. E.g.:
+
+ ../configure [...] CPPFLAGS='-I/my/include' LDFLAGS='-L/my/lib'
+
+The locations found will not be hardcoded into the build executables and
+libraries, so with this approach you will probably also need to set
+LD_LIBRARY_PATH correspondingly, to allow Guile to find the necessary
+libraries again at runtime.