diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -52,6 +52,31 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20220811: new iconv encoder trait added
+OLD_LIBS+=usr/lib/i18n/libBIG5.so.4
+OLD_LIBS+=usr/lib/i18n/libDECHanyu.so.4
+OLD_LIBS+=usr/lib/i18n/libEUC.so.4
+OLD_LIBS+=usr/lib/i18n/libEUCTW.so.4
+OLD_LIBS+=usr/lib/i18n/libGBK2K.so.4
+OLD_LIBS+=usr/lib/i18n/libHZ.so.4
+OLD_LIBS+=usr/lib/i18n/libISO2022.so.4
+OLD_LIBS+=usr/lib/i18n/libJOHAB.so.4
+OLD_LIBS+=usr/lib/i18n/libMSKanji.so.4
+OLD_LIBS+=usr/lib/i18n/libUES.so.4
+OLD_LIBS+=usr/lib/i18n/libUTF1632.so.4
+OLD_LIBS+=usr/lib/i18n/libUTF7.so.4
+OLD_LIBS+=usr/lib/i18n/libUTF8.so.4
+OLD_LIBS+=usr/lib/i18n/libVIQR.so.4
+OLD_LIBS+=usr/lib/i18n/libZW.so.4
+OLD_LIBS+=usr/lib/i18n/libiconv_none.so.4
+OLD_LIBS+=usr/lib/i18n/libiconv_std.so.4
+OLD_LIBS+=usr/lib/i18n/libmapper_646.so.4
+OLD_LIBS+=usr/lib/i18n/libmapper_none.so.4
+OLD_LIBS+=usr/lib/i18n/libmapper_parallel.so.4
+OLD_LIBS+=usr/lib/i18n/libmapper_serial.so.4
+OLD_LIBS+=usr/lib/i18n/libmapper_std.so.4
+OLD_LIBS+=usr/lib/i18n/libmapper_zone.so.4
+
 # 202208XX: raw socket layer removed
 OLD_FILES+=usr/include/net/raw_cb.h
 
diff --git a/lib/libc/iconv/citrus_module.c b/lib/libc/iconv/citrus_module.c
--- a/lib/libc/iconv/citrus_module.c
+++ b/lib/libc/iconv/citrus_module.c
@@ -106,7 +106,7 @@
 #include <string.h>
 #include <unistd.h>
 
-#define	I18NMODULE_MAJOR	4
+#define	I18NMODULE_MAJOR	5
 
 #include "citrus_namespace.h"
 #include "citrus_bcs.h"
diff --git a/lib/libc/iconv/citrus_namespace.h b/lib/libc/iconv/citrus_namespace.h
--- a/lib/libc/iconv/citrus_namespace.h
+++ b/lib/libc/iconv/citrus_namespace.h
@@ -223,6 +223,7 @@
 #define _stdenc_wctomb		_citrus_stdenc_wctomb
 #define _stdenc_put_state_reset	_citrus_stdenc_put_state_reset
 #define _stdenc_get_state_size	_citrus_stdenc_get_state_size
+#define _stdenc_get_mb_cur_min	_citrus_stdenc_get_mb_cur_min
 #define _stdenc_get_mb_cur_max	_citrus_stdenc_get_mb_cur_max
 #define _stdenc_get_state_desc	_citrus_stdenc_get_state_desc
 #define _STDENC_SDID_GENERIC	_CITRUS_STDENC_SDID_GENERIC
diff --git a/lib/libc/iconv/citrus_stdenc.h b/lib/libc/iconv/citrus_stdenc.h
--- a/lib/libc/iconv/citrus_stdenc.h
+++ b/lib/libc/iconv/citrus_stdenc.h
@@ -115,6 +115,20 @@
 	return (ce->ce_traits->et_state_size);
 }
 
+static __inline size_t
+_citrus_stdenc_get_mb_cur_min(struct _citrus_stdenc *ce)
+{
+
+	return (ce->ce_traits->et_mb_cur_min);
+}
+
+static __inline size_t
+_citrus_stdenc_get_mb_cur_max(struct _citrus_stdenc *ce)
+{
+
+	return (ce->ce_traits->et_mb_cur_max);
+}
+
 static __inline int
 _citrus_stdenc_get_state_desc(struct _citrus_stdenc * __restrict ce,
     void * __restrict ps, int id,
diff --git a/lib/libc/iconv/citrus_stdenc_local.h b/lib/libc/iconv/citrus_stdenc_local.h
--- a/lib/libc/iconv/citrus_stdenc_local.h
+++ b/lib/libc/iconv/citrus_stdenc_local.h
@@ -149,6 +149,8 @@
 	/* version 0x00000001 */
 	size_t				 et_state_size;
 	size_t				 et_mb_cur_max;
+	/* version 0x00000005 */
+	size_t				 et_mb_cur_min;
 };
 
 struct _citrus_stdenc {
diff --git a/lib/libc/iconv/citrus_stdenc_template.h b/lib/libc/iconv/citrus_stdenc_template.h
--- a/lib/libc/iconv/citrus_stdenc_template.h
+++ b/lib/libc/iconv/citrus_stdenc_template.h
@@ -49,6 +49,11 @@
 #define _CE_TO_EI(_ce_)	(_TO_EI((_ce_)->ce_closure))
 #define _TO_STATE(_ps_)	((_ENCODING_STATE*)(_ps_))
 
+#ifndef _ENCODING_MB_CUR_MIN
+/* Assume one byte minimum unless otherwise specified. */
+#define	_ENCODING_MB_CUR_MIN(_ei_)	1
+#endif
+
 /* ----------------------------------------------------------------------
  * templates for public functions
  */
@@ -87,6 +92,7 @@
 	ce->ce_closure = ei;
 	et->et_state_size = sizeof(_ENCODING_STATE);
 	et->et_mb_cur_max = _ENCODING_MB_CUR_MAX(_CE_TO_EI(ce));
+	et->et_mb_cur_min = _ENCODING_MB_CUR_MIN(_CE_TO_EI(ce));
 
 	return (0);
 }
diff --git a/lib/libiconv_modules/Makefile.inc b/lib/libiconv_modules/Makefile.inc
--- a/lib/libiconv_modules/Makefile.inc
+++ b/lib/libiconv_modules/Makefile.inc
@@ -2,7 +2,7 @@
 
 .PATH: ${SRCTOP}/lib/libc/iconv
 
-SHLIB_MAJOR= 4
+SHLIB_MAJOR= 5
 CFLAGS+= -I${SRCTOP}/lib/libc/iconv
 
 CFLAGS+=	-Dbool=_Bool
diff --git a/lib/libiconv_modules/UTF1632/citrus_utf1632.c b/lib/libiconv_modules/UTF1632/citrus_utf1632.c
--- a/lib/libiconv_modules/UTF1632/citrus_utf1632.c
+++ b/lib/libiconv_modules/UTF1632/citrus_utf1632.c
@@ -77,6 +77,7 @@
 typedef struct {
 	int		 preffered_endian;
 	unsigned int	 cur_max;
+	unsigned int	 cur_min;
 	uint32_t	 mode;
 } _UTF1632EncodingInfo;
 
@@ -84,6 +85,7 @@
 #define _ENCODING_INFO			_UTF1632EncodingInfo
 #define _ENCODING_STATE			_UTF1632State
 #define _ENCODING_MB_CUR_MAX(_ei_)	((_ei_)->cur_max)
+#define _ENCODING_MB_CUR_MIN(_ei_)	((_ei_)->cur_min)
 #define _ENCODING_IS_STATE_DEPENDENT	0
 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
 
@@ -390,6 +392,7 @@
 
 	parse_variable(ei, var, lenvar);
 
+	ei->cur_min = ((ei->mode&_MODE_UTF32) == 0) ? 2 : 4;
 	ei->cur_max = ((ei->mode&_MODE_UTF32) == 0) ? 6 : 8;
 	/* 6: endian + surrogate */
 	/* 8: endian + normal */
diff --git a/tools/build/mk/OptionalObsoleteFiles.inc b/tools/build/mk/OptionalObsoleteFiles.inc
--- a/tools/build/mk/OptionalObsoleteFiles.inc
+++ b/tools/build/mk/OptionalObsoleteFiles.inc
@@ -2455,6 +2455,52 @@
 OLD_FILES+=usr/bin/mkesdb
 OLD_FILES+=usr/include/_libiconv_compat.h
 OLD_FILES+=usr/include/iconv.h
+OLD_LIBS+=usr/lib/i18n/libBIG5.so.5
+OLD_FILES+=usr/lib/i18n/libBIG5.so
+OLD_LIBS+=usr/lib/i18n/libDECHanyu.so.5
+OLD_FILES+=usr/lib/i18n/libDECHanyu.so
+OLD_LIBS+=usr/lib/i18n/libEUC.so.5
+OLD_FILES+=usr/lib/i18n/libEUC.so
+OLD_LIBS+=usr/lib/i18n/libEUCTW.so.5
+OLD_FILES+=usr/lib/i18n/libEUCTW.so
+OLD_LIBS+=usr/lib/i18n/libGBK2K.so.5
+OLD_FILES+=usr/lib/i18n/libGBK2K.so
+OLD_LIBS+=usr/lib/i18n/libHZ.so.5
+OLD_FILES+=usr/lib/i18n/libHZ.so
+OLD_LIBS+=usr/lib/i18n/libISO2022.so.5
+OLD_FILES+=usr/lib/i18n/libISO2022.so
+OLD_LIBS+=usr/lib/i18n/libJOHAB.so.5
+OLD_FILES+=usr/lib/i18n/libJOHAB.so
+OLD_LIBS+=usr/lib/i18n/libMSKanji.so.5
+OLD_FILES+=usr/lib/i18n/libMSKanji.so
+OLD_LIBS+=usr/lib/i18n/libUES.so.5
+OLD_FILES+=usr/lib/i18n/libUES.so
+OLD_LIBS+=usr/lib/i18n/libUTF1632.so.5
+OLD_FILES+=usr/lib/i18n/libUTF1632.so
+OLD_LIBS+=usr/lib/i18n/libUTF7.so.5
+OLD_FILES+=usr/lib/i18n/libUTF7.so
+OLD_LIBS+=usr/lib/i18n/libUTF8.so.5
+OLD_FILES+=usr/lib/i18n/libUTF8.so
+OLD_LIBS+=usr/lib/i18n/libVIQR.so.5
+OLD_FILES+=usr/lib/i18n/libVIQR.so
+OLD_LIBS+=usr/lib/i18n/libZW.so.5
+OLD_FILES+=usr/lib/i18n/libZW.so
+OLD_LIBS+=usr/lib/i18n/libiconv_none.so.5
+OLD_FILES+=usr/lib/i18n/libiconv_none.so
+OLD_LIBS+=usr/lib/i18n/libiconv_std.so.5
+OLD_FILES+=usr/lib/i18n/libiconv_std.so
+OLD_LIBS+=usr/lib/i18n/libmapper_646.so.5
+OLD_FILES+=usr/lib/i18n/libmapper_646.so
+OLD_LIBS+=usr/lib/i18n/libmapper_none.so.5
+OLD_FILES+=usr/lib/i18n/libmapper_none.so
+OLD_LIBS+=usr/lib/i18n/libmapper_parallel.so.5
+OLD_FILES+=usr/lib/i18n/libmapper_parallel.so
+OLD_LIBS+=usr/lib/i18n/libmapper_serial.so.5
+OLD_FILES+=usr/lib/i18n/libmapper_serial.so
+OLD_LIBS+=usr/lib/i18n/libmapper_std.so.5
+OLD_FILES+=usr/lib/i18n/libmapper_std.so
+OLD_LIBS+=usr/lib/i18n/libmapper_zone.so.5
+OLD_FILES+=usr/lib/i18n/libmapper_zone.so
 OLD_FILES+=usr/share/man/man1/iconv.1.gz
 OLD_FILES+=usr/share/man/man1/mkcsmapper.1.gz
 OLD_FILES+=usr/share/man/man1/mkesdb.1.gz
@@ -2468,6 +2514,7 @@
 OLD_FILES+=usr/share/man/man3/iconv_open_into.3.gz
 OLD_FILES+=usr/share/man/man3/iconvctl.3.gz
 OLD_FILES+=usr/share/man/man3/iconvlist.3.gz
+OLD_DIRS+=usr/lib/i18n
 OLD_DIRS+=usr/share/i18n
 OLD_DIRS+=usr/share/i18n/esdb
 OLD_DIRS+=usr/share/i18n/esdb/ISO-2022