diff --git a/honoka/configure.ac b/honoka/configure.ac
index 143f7dd..9e00c1e 100644
--- a/honoka/configure.ac
+++ b/honoka/configure.ac
@@ -69,6 +69,16 @@
 
 AC_CHECK_LIB(crypt, crypt)
 
+AC_ARG_ENABLE(wnn,
+[  --enable-wnn    Turn on WnnConversion],
+[case "${enableval}" in
+  yes) wnn=true ;;
+  no)  wnn=false ;;
+  *) AC_MSG_ERROR(bad value ${enableval} for --enable-wnn) ;;
+esac],[wnn=true])
+AM_CONDITIONAL(WNNCONVERSION, [test "x$wnn" = "xtrue"])
+
+if test "x$wnn" = "xtrue"; then
 AC_CHECK_LIB(wnn7, jl_yosoku_init,, [AC_MSG_RESULT(libwnn7 not found.)])
 if echo $LIBS | grep -v "wnn7" > /dev/null; then
   AC_CHECK_LIB(wnn, jl_yosoku_init,, [AC_MSG_RESULT(libwnn for Wnn7 not found.)])
@@ -85,16 +95,43 @@
   if echo $LIBS | grep "wnn.*" > /dev/null; then
     AC_DEFINE([HAVE_LIBWNN6],1,[])
   else
-    AC_MSG_ERROR(Wnn6 or Wnn7 library not found.)
+    AC_MSG_RESULT(Wnn6 or Wnn7 library not found.)
+    WNNCONVERSION="false"
   fi
 fi
+if echo $LIBS | grep "wnn.*" > /dev/null; then
+  AC_DEFINE([HAVE_LIBWNN],1,[])
+fi
+fi
+AC_SUBST(WNNCONVERSION)
 
+AC_ARG_ENABLE(anthy,
+[  --enable-anthy    Turn on AnthyConversion],
+[case "${enableval}" in
+  yes) anthy=true ;;
+  no)  anthy=false ;;
+  *) AC_MSG_ERROR(bad value ${enableval} for --enable-anthy) ;;
+esac],[anthy=true])
+AM_CONDITIONAL(ANTHYCONVERSION, [test "x$anthy" = "xtrue"])
+
+if test "x$anthy" = "xtrue"; then
 AC_CHECK_HEADER([anthy/anthy.h], [
   LIBS="$LIBS -lanthy -lanthydic"
 ],[])
 if echo $LIBS | grep "anthy" > /dev/null; then
   AC_DEFINE([HAVE_LIBANTHY],[1],[Anthy])
+else
+  ANTHYCONVERSION="false"
 fi
+fi
+AC_SUBST(ANTHYCONVERSION)
+
+if echo $LIBS | grep -v "wnn" > /dev/null; then
+  if echo $LIBS | grep -v "anthy" > /dev/null; then
+    AC_MSG_ERROR(Wnn or Anthy library not found.)
+  fi
+fi
+
 
 # Checks for header files.
 AC_HEADER_STDC
diff --git a/honoka/m4/Makefile b/honoka/m4/Makefile
index 4dba651..4c0e56e 100644
--- a/honoka/m4/Makefile
+++ b/honoka/m4/Makefile
@@ -66,6 +66,9 @@
 AMDEP_FALSE = #
 AMDEP_TRUE = 
 AMTAR = ${SHELL} /home/tamra/ANef/honoka/missing --run tar
+ANTHYCONVERSION = 
+ANTHYCONVERSION_FALSE = #
+ANTHYCONVERSION_TRUE = 
 AR = ar
 AUTOCONF = ${SHELL} /home/tamra/ANef/honoka/missing --run autoconf
 AUTOHEADER = ${SHELL} /home/tamra/ANef/honoka/missing --run autoheader
@@ -164,6 +167,9 @@
 USE_INCLUDED_LIBINTL = no
 USE_NLS = yes
 VERSION = 0.3.0
+WNNCONVERSION = 
+WNNCONVERSION_FALSE = #
+WNNCONVERSION_TRUE = 
 XGETTEXT = /usr/bin/xgettext
 ac_aux_dir = .
 ac_ct_AR = ar
diff --git a/honoka/m4/Makefile.in b/honoka/m4/Makefile.in
index 2b20a38..630d312 100644
--- a/honoka/m4/Makefile.in
+++ b/honoka/m4/Makefile.in
@@ -66,6 +66,9 @@
 AMDEP_FALSE = @AMDEP_FALSE@
 AMDEP_TRUE = @AMDEP_TRUE@
 AMTAR = @AMTAR@
+ANTHYCONVERSION = @ANTHYCONVERSION@
+ANTHYCONVERSION_FALSE = @ANTHYCONVERSION_FALSE@
+ANTHYCONVERSION_TRUE = @ANTHYCONVERSION_TRUE@
 AR = @AR@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
@@ -164,6 +167,9 @@
 USE_INCLUDED_LIBINTL = @USE_INCLUDED_LIBINTL@
 USE_NLS = @USE_NLS@
 VERSION = @VERSION@
+WNNCONVERSION = @WNNCONVERSION@
+WNNCONVERSION_FALSE = @WNNCONVERSION_FALSE@
+WNNCONVERSION_TRUE = @WNNCONVERSION_TRUE@
 XGETTEXT = @XGETTEXT@
 ac_aux_dir = @ac_aux_dir@
 ac_ct_AR = @ac_ct_AR@
diff --git a/honoka/src/Makefile.am b/honoka/src/Makefile.am
index ac13818..563adbd 100644
--- a/honoka/src/Makefile.am
+++ b/honoka/src/Makefile.am
@@ -29,11 +29,19 @@
 					wnnconversion.h honoka_def.h preeditor.h kanainput.h convertor.h anthyconversion.h \
 	honokapluginbase.h
 
+if WNNCONVERSION
+WNNSOURCE = wnnconversion.cpp
+endif
+
+if ANTHYCONVERSION
+ANTHYSOURCE = anthyconversion.cpp
+endif
+
 moduledir		= @SCIM_MODULEDIR@/IMEngine
 module_LTLIBRARIES	= honoka.la
 
-honoka_la_SOURCES = honoka_imengine.cpp romkan.cpp wnnconversion.cpp convertor.cpp preeditor.cpp \
-				kanainput.cpp anthyconversion.cpp \
+honoka_la_SOURCES = honoka_imengine.cpp romkan.cpp convertor.cpp preeditor.cpp \
+				kanainput.cpp $(WNNSOURCE) $(ANTHYSOURCE) \
 	honokapluginbase.cpp
 
 honoka_la_CFLAGS		= @SCIM_CFLAGS@ @SCIM_DEBUG_FLAGS@
diff --git a/honoka/src/anthyconversion.cpp b/honoka/src/anthyconversion.cpp
index 4c6f0b5..b039399 100644
--- a/honoka/src/anthyconversion.cpp
+++ b/honoka/src/anthyconversion.cpp
@@ -19,8 +19,6 @@
  ***************************************************************************/
 #include "anthyconversion.h"
 
-#ifdef HAVE_LIBANTHY
-
 
 AnthyConversion::AnthyConversion(ConfigPointer cfg) : Convertor(cfg)
 {
@@ -172,5 +170,4 @@
     return(String("Anthy"));
 }
 
-#endif
 
diff --git a/honoka/src/anthyconversion.h b/honoka/src/anthyconversion.h
index 9660501..0cd0595 100644
--- a/honoka/src/anthyconversion.h
+++ b/honoka/src/anthyconversion.h
@@ -24,7 +24,6 @@
 #include <config.h>
 #endif
 
-#ifdef HAVE_LIBANTHY
 
 #define Uses_SCIM_CONFIG_BASE
 
@@ -79,6 +78,5 @@
 
 };
 
-#endif
 
 #endif
diff --git a/honoka/src/honoka_imengine.cpp b/honoka/src/honoka_imengine.cpp
index b825d1b..14d26e3 100644
--- a/honoka/src/honoka_imengine.cpp
+++ b/honoka/src/honoka_imengine.cpp
@@ -55,6 +55,13 @@
 #endif
 
 
+#define DEFAULT 0
+#define IKEIJI  1
+#define RENSOU  2
+#define YOSOKU  3
+
+
+
 static Pointer <HonokaFactory> _honoka_factory;
 static ConfigPointer _scim_config;
 
@@ -184,7 +191,9 @@
     preeditors.push_back(new KanaInput(_scim_config));
     m_preeditor = preeditors.at(0);
     
+    #ifdef HAVE_LIBWNN
     convertors.push_back(new WnnConversion(_scim_config));
+    #endif
     #ifdef HAVE_LIBANTHY
     convertors.push_back(new AnthyConversion(_scim_config));
     #endif
diff --git a/honoka/src/honoka_imengine.h b/honoka/src/honoka_imengine.h
index 10a78bb..8e18434 100644
--- a/honoka/src/honoka_imengine.h
+++ b/honoka/src/honoka_imengine.h
@@ -20,21 +20,25 @@
 #ifndef SCIM_WNN_IMENGINE_H
 #define SCIM_WNN_IMENGINE_H
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <cstdio>
 #include <cstdlib>
 #include <vector>
 #include <romkan.h>
 #include <kanainput.h>
-#include <wnnconversion.h>
-#include <anthyconversion.h>
+#ifdef HAVE_LIBWNN
+  #include <wnnconversion.h>
+#endif
+#ifdef HAVE_LIBANTHY
+  #include <anthyconversion.h>
+#endif
 #define Uses_SCIM_ICONV
 #include <scim.h>
 #include <scim_iconv.h>
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
 
 using namespace scim;
 using namespace std;
diff --git a/honoka/src/wnnconversion.cpp b/honoka/src/wnnconversion.cpp
index 48d40a7..01892e6 100644
--- a/honoka/src/wnnconversion.cpp
+++ b/honoka/src/wnnconversion.cpp
@@ -18,6 +18,8 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 #include "wnnconversion.h"
+
+
 #include <honoka_def.h>
 
 #ifdef HAVE_CONFIG_H
@@ -502,5 +504,3 @@
     return(String("Wnn"));
 }
 
-
-
diff --git a/honoka/src/wnnconversion.h b/honoka/src/wnnconversion.h
index 39114b2..cf0df0f 100644
--- a/honoka/src/wnnconversion.h
+++ b/honoka/src/wnnconversion.h
@@ -20,6 +20,9 @@
 #ifndef WNNCONVERSION_H
 #define WNNCONVERSION_H
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
 
 #include <cstdio>
 #include <cstdlib>
@@ -31,9 +34,6 @@
 #include <scim_attribute.h>
 #include <convertor.h>
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif