[configure] removed useless deps checks

Makefile

@@ -57,12 +57,6 @@ VERSION_CODENAME:=$(shell $(CAT) VERSION_CODENAME)
 all: config.sed
 	dune build $(DUNE_BUILD_OPTS) @install
 
-ifeq ($(HAS_DOT),yes)
-OPTDOT=Some \"$(DOT)\"
-else
-OPTDOT=None
-endif
-
 MAJOR_VERSION=$(shell $(SED) -E 's/^([0-9]+)\..*/\1/' VERSION)
 MINOR_VERSION=$(shell $(SED) -E 's/^[0-9]+\.([0-9]+).*/\1/' VERSION)
 VERSION_CODENAME=$(shell $(CAT) VERSION_CODENAME)
@@ -79,7 +73,6 @@ config.sed: VERSION share/Makefile.config share/Makefile.common Makefile configu
 	@echo "s|@FRAMAC_GNU_CPP@|$(FRAMAC_GNU_CPP)|" >> $@
 	@echo "s|@DEFAULT_CPP_KEEP_COMMENTS@|$(DEFAULT_CPP_KEEP_COMMENTS)|" >> $@
 	@echo "s|@DEFAULT_CPP_SUPPORTED_ARCH_OPTS@|$(DEFAULT_CPP_SUPPORTED_ARCH_OPTS)|" >> $@
-	@echo "s|@OPTDOT@|$(OPTDOT)|" >> $@
 
 clean:: purge-tests # to be done before a "dune" command
 	dune clean

configure.ac

@@ -519,16 +519,6 @@ CPPFLAGS=$OLD_CPPFLAGS
 
 AC_MSG_RESULT(Default preprocessor supported architecture-related options: $DEFAULT_CPP_SUPPORTED_ARCH_OPTS)
 
-# dot and xdot tools
-####################
-
-configure_tool([DOT],[dot],[dot not found: you should install GraphViz],no)
-
-configure_tool([UNIX2DOS],[unix2dos],
-               [unix2dos not found: you should install tofrodos],no)
-
-plugin_use_external(tests,unix2dos)
-
 ############################
 # Substitutions to perform #
 ############################

src/kernel_internals/runtime/dump_config.ml

@@ -67,7 +67,6 @@ let dump_to_json () =
     "preprocessor_supported_arch_options",
     list string Fc_config.preprocessor_supported_arch_options ;
     "preprocessor_keep_comments", `Bool Fc_config.preprocessor_keep_comments ;
-    "dot", (match Fc_config.dot with Some cmd -> `String cmd | None -> `Null) ;
     "current_machdep", `String (Kernel.Machdep.get ()) ;
     "machdeps", list string (File.list_available_machdeps ()) ;
     "plugins", list string (list_plugin_names ()) ;

src/kernel_internals/runtime/fc_config.ml.in

@@ -63,5 +63,3 @@ let preprocessor_supported_arch_options = [@DEFAULT_CPP_SUPPORTED_ARCH_OPTS@]
 
 let preprocessor_keep_comments =
   env_or_default (fun _ -> true) @DEFAULT_CPP_KEEP_COMMENTS@
-
-let dot = @OPTDOT@

src/kernel_internals/runtime/fc_config.mli

@@ -98,11 +98,6 @@ val preprocessor_keep_comments: bool
     @since Neon-rc3
 *)
 
-val dot: string option
-(** Dot command name.
-    @return [None] if `dot' is not installed.
-    @since Carbon-20101201 *)
-
 (*
   Local Variables:
   compile-command: "make -C ../../.."