This patch makes zip use libnatspec to recode file names is national charset.
Initially this patch was written for altlinux:
http://sisyphus.ru/ru/srpm/Sisyphus/zip/patches

Later it was a bit improved and improved version was posted here (in Russian):
http://www.opennet.ru/tips/info/2494.shtml

Gentoo reference:
https://bugs.gentoo.org/show_bug.cgi?id=275244

diff -pur unzip60orig/unix/configure unzip60/unix/configure
--- unzip60orig/unix/configure	2009-04-16 23:25:12.000000000 +0400
+++ unzip60/unix/configure	2010-11-26 19:07:43.000000000 +0300
@@ -17,7 +17,7 @@ CFLAGSR=${CFLAGS}
 IZ_BZIP2=${3}
 CFLAGS="${CFLAGS} -I. -DUNIX"
 LFLAGS1=""
-LFLAGS2="-s"
+LFLAGS2="-l natspec"
 LN="ln -s"
 
 CFLAGS_OPT=''
diff -pur unzip60orig/unix/Makefile unzip60/unix/Makefile
--- unzip60orig/unix/Makefile	2009-01-19 01:41:18.000000000 +0300
+++ unzip60/unix/Makefile	2010-11-29 14:25:58.461000001 +0300
@@ -45,14 +45,14 @@
 CC = cc#	try using "gcc" target rather than changing this (CC and LD
 LD = $(CC)#	must match, else "unresolved symbol:  ___main" is possible)
 AS = as
-LOC = $(D_USE_BZ2) $(LOCAL_UNZIP)
+LOC = $(D_USE_BZ2) -DNO_SETLOCALE $(LOCAL_UNZIP)
 AF = $(LOC)
 CFLAGS = -O
 CF_NOOPT = -I. -I$(IZ_BZIP2) -DUNIX $(LOC)
 CF = $(CFLAGS) $(CF_NOOPT)
 LFLAGS1 =
 LF = -o unzip$E $(LFLAGS1)
-LF2 = -s
+LF2 = -l natspec
 
 # UnZipSFX flags
 SL = -o unzipsfx$E $(LFLAGS1)
@@ -121,7 +121,7 @@ INSTALL_PROGRAM = $(INSTALL)
 INSTALL_D = mkdir -p
 # on some systems, manext=l and MANDIR=/usr/man/man$(manext) may be appropriate
 manext = 1
-prefix = /usr/local
+prefix = /usr
 BINDIR = $(prefix)/bin#			where to install executables
 MANDIR = $(prefix)/man/man$(manext)#	where to install man pages
 INSTALLEDBIN = $(BINDIR)/funzip$E $(BINDIR)/unzip$E $(BINDIR)/unzipsfx$E \
diff -pur unzip60orig/unix/unix.c unzip60/unix/unix.c
--- unzip60orig/unix/unix.c	2009-01-24 02:31:26.000000000 +0300
+++ unzip60/unix/unix.c	2010-11-26 16:58:35.000000000 +0300
@@ -30,6 +30,9 @@
 #define UNZIP_INTERNAL
 #include "unzip.h"
 
+#include <iconv.h>
+#include <natspec.h>
+
 #ifdef SCO_XENIX
 #  define SYSNDIR
 #else  /* SCO Unix, AIX, DNIX, TI SysV, Coherent 4.x, ... */
@@ -1874,3 +1877,44 @@ static void qlfix(__G__ ef_ptr, ef_len)
     }
 }
 #endif /* QLZIP */
+
+
+char OEM_CP[MAX_CP_NAME] = "";
+char ISO_CP[MAX_CP_NAME] = "";
+
+/* Getr the default value of OEM_CP based on the current locale.
+ * ISO_CP is left alone for now. */
+void init_conversion_charsets()
+{
+    /* Make a guess only if OEM_CP not already set. */ 
+    if(*OEM_CP == '\0') {
+        const char * archive_charset = natspec_get_charset_by_locale(NATSPEC_DOSCS, "");
+        strncpy(OEM_CP, archive_charset, sizeof(OEM_CP));
+    }
+
+    if(*ISO_CP == '\0') {
+        const char * archive_charset = natspec_get_charset_by_locale(NATSPEC_WINCS, "");
+        strncpy(ISO_CP, archive_charset, sizeof(ISO_CP));
+    }
+
+}
+
+/* Convert a string from OEM_CP to the current locale charset. */
+inline void oem_intern(char *string)
+{
+    char *buf = natspec_convert(string, 0, OEM_CP, 0);
+	/* Since Ext_ASCII_TO_Native used only for G.filename[FILNAMESIZE],
+	   use FILNAMSIZ as string size */
+    strncpy(string, buf, FILNAMSIZ);
+	free (buf);
+}
+
+/* Convert a string from ISO_CP to the current locale charset. */
+inline void iso_intern(char *string)
+{
+    char *buf = natspec_convert(string, 0, ISO_CP, 0);
+	/* Since Ext_ASCII_TO_Native used only for G.filename[FILNAMESIZE],
+	   use FILNAMSIZ as string size */
+    strncpy(string, buf, FILNAMSIZ);
+	free (buf);
+}
diff -pur unzip60orig/unix/unxcfg.h unzip60/unix/unxcfg.h
--- unzip60orig/unix/unxcfg.h	2009-04-16 22:36:12.000000000 +0400
+++ unzip60/unix/unxcfg.h	2010-11-26 16:58:35.000000000 +0300
@@ -227,4 +227,30 @@ typedef struct stat z_stat;
 /* wild_dir, dirname, wildname, matchname[], dirnamelen, have_dirname, */
 /*    and notfirstcall are used by do_wild().                          */
 
+
+#define MAX_CP_NAME 25 
+   
+#ifdef SETLOCALE
+#  undef SETLOCALE
+#endif
+#define SETLOCALE(category, locale) setlocale(category, locale)
+#include <locale.h>
+   
+#ifdef _ISO_INTERN
+#  undef _ISO_INTERN
+#endif
+#define _ISO_INTERN(str1) iso_intern(str1)
+
+#ifdef _OEM_INTERN
+#  undef _OEM_INTERN
+#endif
+#ifndef IZ_OEM2ISO_ARRAY
+#  define IZ_OEM2ISO_ARRAY
+#endif
+#define _OEM_INTERN(str1) oem_intern(str1)
+
+void iso_intern(char *);
+void oem_intern(char *);
+void init_conversion_charsets(void);
+   
 #endif /* !__unxcfg_h */
diff -pur unzip60orig/unzip.c unzip60/unzip.c
--- unzip60orig/unzip.c	2009-04-16 22:26:52.000000000 +0400
+++ unzip60/unzip.c	2010-11-26 16:58:35.000000000 +0300
@@ -331,7 +331,9 @@ static ZCONST char Far ZipInfoUsageLine3
   -h  print header line       -t  print totals for listed files or for all\n\
   -z  print zipfile comment   -T  print file times in sortable decimal format\
 \n  -C  be case-insensitive   %s\
-  -x  exclude filenames that follow from listing\n";
+  -x  exclude filenames that follow from listing\n\
+  -O CHARSET  specify a character encoding for DOS, Windows and OS/2 archives\n\
+  -I CHARSET  specify a character encoding for UNIX and other archives\n";
 #ifdef MORE
    static ZCONST char Far ZipInfoUsageLine4[] =
      "  -M  page output through built-in \"more\"\n";
@@ -673,7 +674,9 @@ modifiers:\n\
   -j  junk paths (do not make directories)   -aa treat ALL files as text\n\
   -U  use escapes for all non-ASCII Unicode  -UU ignore any Unicode fields\n\
   -C  match filenames case-insensitively     -L  make (some) names \
-lowercase\n %-42s  -V  retain VMS version numbers\n%s";
+lowercase\n %-42s  -V  retain VMS version numbers\n%s\
+  -O CHARSET  specify a character encoding for DOS, Windows and OS/2 archives\n\
+  -I CHARSET  specify a character encoding for UNIX and other archives\n";
 #endif /* ?VMS */
 #else /* !UNICODE_SUPPORT */
 #ifdef VMS
@@ -692,7 +695,9 @@ modifiers:\n\
   -o  overwrite files WITHOUT prompting      -a  auto-convert any text files\n\
   -j  junk paths (do not make directories)   -aa treat ALL files as text\n\
   -C  match filenames case-insensitively     -L  make (some) names \
-lowercase\n %-42s  -V  retain VMS version numbers\n%s";
+lowercase\n %-42s  -V  retain VMS version numbers\n%s\
+  -O CHARSET  specify a character encoding for DOS, Windows and OS/2 archives\n\
+  -I CHARSET  specify a character encoding for UNIX and other archives\n";
 #endif /* ?VMS */
 #endif /* ?UNICODE_SUPPORT */
 
@@ -803,6 +808,10 @@ int unzip(__G__ argc, argv)
 #endif /* UNICODE_SUPPORT */
 
 
+#ifdef UNIX
+    init_conversion_charsets();
+#endif
+
 #if (defined(__IBMC__) && defined(__DEBUG_ALLOC__))
     extern void DebugMalloc(void);
 
@@ -1336,6 +1345,11 @@ int uz_opts(__G__ pargc, pargv)
     argc = *pargc;
     argv = *pargv;
 
+#ifdef UNIX
+    extern char OEM_CP[MAX_CP_NAME];
+    extern char ISO_CP[MAX_CP_NAME];
+#endif
+    
     while (++argv, (--argc > 0 && *argv != NULL && **argv == '-')) {
         s = *argv + 1;
         while ((c = *s++) != 0) {    /* "!= 0":  prevent Turbo C warning */
@@ -1517,6 +1531,35 @@ int uz_opts(__G__ pargc, pargv)
                     }
                     break;
 #endif  /* MACOS */
+#ifdef UNIX
+    			case ('I'):
+                    if (negative) {
+                        Info(slide, 0x401, ((char *)slide,
+                          "error:  encodings can't be negated"));
+                        return(PK_PARAM);
+    				} else {
+    					if(*s) { /* Handle the -Icharset case */
+    						/* Assume that charsets can't start with a dash to spot arguments misuse */
+    						if(*s == '-') { 
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -I argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						strncpy(ISO_CP, s, sizeof(ISO_CP));
+    					} else { /* -I charset */
+    						++argv;
+    						if(!(--argc > 0 && *argv != NULL && **argv != '-')) {
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -I argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						s = *argv;
+    						strncpy(ISO_CP, s, sizeof(ISO_CP));
+    					}
+    					while(*(++s)); /* No params straight after charset name */
+    				}
+    				break;
+#endif /* ?UNIX */
                 case ('j'):    /* junk pathnames/directory structure */
                     if (negative)
                         uO.jflag = FALSE, negative = 0;
@@ -1592,6 +1635,35 @@ int uz_opts(__G__ pargc, pargv)
                     } else
                         ++uO.overwrite_all;
                     break;
+#ifdef UNIX
+    			case ('O'):
+                    if (negative) {
+                        Info(slide, 0x401, ((char *)slide,
+                          "error:  encodings can't be negated"));
+                        return(PK_PARAM);
+    				} else {
+    					if(*s) { /* Handle the -Ocharset case */
+    						/* Assume that charsets can't start with a dash to spot arguments misuse */
+    						if(*s == '-') { 
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -I argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						strncpy(OEM_CP, s, sizeof(OEM_CP));
+    					} else { /* -O charset */
+    						++argv;
+    						if(!(--argc > 0 && *argv != NULL && **argv != '-')) {
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -O argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						s = *argv;
+    						strncpy(OEM_CP, s, sizeof(OEM_CP));
+    					}
+    					while(*(++s)); /* No params straight after charset name */
+    				}
+    				break;
+#endif /* ?UNIX */
                 case ('p'):    /* pipes:  extract to stdout, no messages */
                     if (negative) {
                         uO.cflag = FALSE;
diff -pur unzip60orig/unzpriv.h unzip60/unzpriv.h
--- unzip60orig/unzpriv.h	2009-04-20 03:59:26.000000000 +0400
+++ unzip60/unzpriv.h	2010-11-26 16:58:35.000000000 +0300
@@ -3008,7 +3008,7 @@ char    *GetLoadPath     OF((__GPRO));  
          !(((islochdr) || (isuxatt)) && \
            ((hostver) == 25 || (hostver) == 26 || (hostver) == 40))) || \
         (hostnum) == FS_HPFS_ || \
-        ((hostnum) == FS_NTFS_ && (hostver) == 50)) { \
+        ((hostnum) == FS_NTFS_/* && (hostver) == 50*/)) { \
         _OEM_INTERN((string)); \
     } else { \
         _ISO_INTERN((string)); \
diff -pur unzip60orig/zipinfo.c unzip60/zipinfo.c
--- unzip60orig/zipinfo.c	2009-02-08 20:04:30.000000000 +0300
+++ unzip60/zipinfo.c	2010-11-26 16:58:35.000000000 +0300
@@ -457,6 +457,10 @@ int zi_opts(__G__ pargc, pargv)
     int    tflag_slm=TRUE, tflag_2v=FALSE;
     int    explicit_h=FALSE, explicit_t=FALSE;
 
+#ifdef UNIX
+    extern char OEM_CP[MAX_CP_NAME];
+    extern char ISO_CP[MAX_CP_NAME];
+#endif
 
 #ifdef MACOS
     uO.lflag = LFLAG;         /* reset default on each call */
@@ -501,6 +505,35 @@ int zi_opts(__G__ pargc, pargv)
                             uO.lflag = 0;
                     }
                     break;
+#ifdef UNIX
+    			case ('I'):
+                    if (negative) {
+                        Info(slide, 0x401, ((char *)slide,
+                          "error:  encodings can't be negated"));
+                        return(PK_PARAM);
+    				} else {
+    					if(*s) { /* Handle the -Icharset case */
+    						/* Assume that charsets can't start with a dash to spot arguments misuse */
+    						if(*s == '-') { 
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -I argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						strncpy(ISO_CP, s, sizeof(ISO_CP));
+    					} else { /* -I charset */
+    						++argv;
+    						if(!(--argc > 0 && *argv != NULL && **argv != '-')) {
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -I argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						s = *argv;
+    						strncpy(ISO_CP, s, sizeof(ISO_CP));
+    					}
+    					while(*(++s)); /* No params straight after charset name */
+    				}
+    				break;
+#endif /* ?UNIX */
                 case 'l':      /* longer form of "ls -l" type listing */
                     if (negative)
                         uO.lflag = -2, negative = 0;
@@ -521,6 +554,35 @@ int zi_opts(__G__ pargc, pargv)
                         G.M_flag = TRUE;
                     break;
 #endif
+#ifdef UNIX
+    			case ('O'):
+                    if (negative) {
+                        Info(slide, 0x401, ((char *)slide,
+                          "error:  encodings can't be negated"));
+                        return(PK_PARAM);
+    				} else {
+    					if(*s) { /* Handle the -Ocharset case */
+    						/* Assume that charsets can't start with a dash to spot arguments misuse */
+    						if(*s == '-') { 
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -I argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						strncpy(OEM_CP, s, sizeof(OEM_CP));
+    					} else { /* -O charset */
+    						++argv;
+    						if(!(--argc > 0 && *argv != NULL && **argv != '-')) {
+    	                        Info(slide, 0x401, ((char *)slide,
+        		                  "error:  a valid character encoding should follow the -O argument"));
+    	                        return(PK_PARAM); 
+    						}
+    						s = *argv;
+    						strncpy(OEM_CP, s, sizeof(OEM_CP));
+    					}
+    					while(*(++s)); /* No params straight after charset name */
+    				}
+    				break;
+#endif /* ?UNIX */
                 case 's':      /* default:  shorter "ls -l" type listing */
                     if (negative)
                         uO.lflag = -2, negative = 0;