new-doc: indexes: add configure options index

src/doc/new-doc/developer-guide/contributing.txi

@@ -21,6 +21,12 @@ For the purpose of this manual we maintain a few indexes:
 
 @verb{|@cindex User extensible streams|}
 
+@item Configure option index – options available in configure script
+
+Mark the default option with capital letters:
+
+@verb{$--enable-clos-streams [YES|builtin|no]$}
+
 @item Feature index – description of an item in @code{*FEATURES*}
 
 @verb{|@ftindex GRAY-STREAMS|}
@@ -87,3 +93,12 @@ Side effects listed
 For instance: if the user has some privigiles on the system
 @end defun
 @end verbatim
+
+@subsubsection Typed functions
+
+@verbatim
+@deftypefun return-type name (type arg)*
+description
+@end deftypefun
+
+@end verbatim

src/doc/new-doc/extensions/ffi.txi

@@ -68,6 +68,9 @@ user may directly invoked.
 @c @item Library FFI (LFFI)
 
 @item Dynamic FFI (DFFI)
+@cfindex --with-libffi-prefix=path
+@cfindex --with-dffi [system|included|AUTO|no]
+
 First of all, the foreign libraries are loaded in memory using the
 facilities of the operating system. Similar routines are used to find
 out and register the memory location of all the functions and variables

src/doc/new-doc/indexes/index.txi

@@ -3,6 +3,7 @@
 
 @menu
 * Concept index::
+* Configure option index::
 * Feature index::
 * Example index::
 * Function index::
@@ -16,6 +17,10 @@
 @section Concept index
 @printindex cp
 
+@node Configure option index
+@section Configure option index
+@printindex cf
+
 @node Feature index
 @section Feature index
 @printindex ft

src/doc/new-doc/new-doc.txi

@@ -6,6 +6,7 @@
 @paragraphindent none
 @defcodeindex cpp
 @defcodeindex lsp
+@defcodeindex cf
 @defcodeindex ft
 @defindex ex
 @c %**end of header