diff --git a/auto/lib/make b/auto/lib/make
index 7acae50..2c2d232 100644
--- a/auto/lib/make
+++ b/auto/lib/make
@@ -1,12 +1,12 @@
 
-if [ $PCRE != NONE -a $PCRE != NO ]; then
+if [ $PCRE != NONE -a $PCRE != NO -a $PCRE != YES ]; then
     . auto/lib/pcre/make
 fi
 
-if [ $MD5 != NONE -a $MD5 != NO ]; then
+if [ $MD5 != NONE -a $MD5 != NO -a $MD5 != YES ]; then
     . auto/lib/md5/make
 fi
 
-if [ $ZLIB != NONE -a $ZLIB != NO ]; then
+if [ $ZLIB != NONE -a $ZLIB != NO -a $ZLIB != YES ]; then
     . auto/lib/zlib/make
 fi
diff --git a/auto/lib/md5/conf b/auto/lib/md5/conf
index 8871038..3fc1af6 100644
--- a/auto/lib/md5/conf
+++ b/auto/lib/md5/conf
@@ -41,16 +41,17 @@
 else
 
     if [ $PLATFORM != win32 ]; then
-            MD5=NO
+        MD5=NO
+        ngx_lib_cflags=
 
-            # Solaris 8/9
+        # Solaris 8/9
 
-            ngx_lib_inc="#include <sys/types.h>
+        ngx_lib_inc="#include <sys/types.h>
 #include <md5.h>"
-            ngx_lib="rsaref md5 library"
-            ngx_lib_test="MD5_CTX md5; MD5Init(&md5)"
-            ngx_libs=-lmd5
-            . auto/lib/test
+        ngx_lib="rsaref md5 library"
+        ngx_lib_test="MD5_CTX md5; MD5Init(&md5)"
+        ngx_libs=-lmd5
+        . auto/lib/test
 
 
         if [ $ngx_found = yes ]; then
@@ -64,7 +65,7 @@
 
             ngx_lib="rsaref md library"
             ngx_lib_test="MD5_CTX md5; MD5Init(&md5)"
-            ngx_libs=-lmd
+            #ngx_libs=-lmd
             . auto/lib/test
         fi
 
@@ -76,13 +77,16 @@
             ngx_found=no
 
         else
-            # OpenSSL crypto library
+            if [ $MD5 = NO ]; then
 
-            ngx_inc="#include <openssl/md5.h>"
-            ngx_lib="OpenSSL md5 crypto library"
-            ngx_lib_test="MD5_CTX md5; MD5_Init(&md5)"
-            ngx_libs=-lcrypto
-            . auto/lib/test
+               # OpenSSL crypto library
+
+               ngx_lib_inc="#include <openssl/md5.h>"
+               ngx_lib="OpenSSL md5 crypto library"
+               ngx_lib_test="MD5_CTX md5; MD5_Init(&md5)"
+               ngx_libs=-lcrypto
+               . auto/lib/test
+            fi
         fi
 
 
diff --git a/auto/lib/pcre/conf b/auto/lib/pcre/conf
index a2ab1c6..29c561b 100644
--- a/auto/lib/pcre/conf
+++ b/auto/lib/pcre/conf
@@ -41,6 +41,9 @@
 
     if [ $PLATFORM != win32 ]; then
             PCRE=NO
+            ngx_lib_cflags=
+
+            # Linux
 
             ngx_lib_inc="#include <pcre.h>"
             ngx_lib="PCRE library"
@@ -55,6 +58,7 @@
             CORE_SRCS="$CORE_SRCS $REGEX_SRCS"
             CORE_LIBS="$CORE_LIBS $ngx_libs"
             PCRE=YES
+            ngx_found=no
 
         else
             # FreeBSD PCRE port.
diff --git a/auto/lib/zlib/conf b/auto/lib/zlib/conf
index 9c2178f..37c1fa7 100644
--- a/auto/lib/zlib/conf
+++ b/auto/lib/zlib/conf
@@ -35,8 +35,11 @@
 else
 
     if [ $PLATFORM != win32 ]; then
-        ngx_lib_inc="#include <zlib.h>"
 
+        # FreeBSD, Solaris, Linux
+
+        ngx_lib_cflags=
+        ngx_lib_inc="#include <zlib.h>"
         ngx_lib="zlib library"
         ngx_lib_test="z_stream z; deflate(&z, Z_NO_FLUSH)"
         ngx_libs=-lz
diff --git a/auto/lib/zlib/make b/auto/lib/zlib/make
index 240b647..d256425 100644
--- a/auto/lib/zlib/make
+++ b/auto/lib/zlib/make
@@ -77,8 +77,11 @@
                 done=YES
             ;;
 
+            NO)
+            ;;
+
             *)
-                echo "$0: error: invalid --with-zlib=asm=$ZLIB_ASM option."
+                echo "$0: error: invalid --with-zlib-asm=$ZLIB_ASM option."
                 echo "The valid values are \"pentium\" and \"pentiumpro\" only".
                 echo
 
diff --git a/auto/os/conf b/auto/os/conf
index 31a041f..94fdbcd 100644
--- a/auto/os/conf
+++ b/auto/os/conf
@@ -30,11 +30,16 @@
     win32)
         CORE_INCS="$WIN32_INCS"
         CORE_DEPS="$WIN32_DEPS"
-        CORE_SRCS="$WIN32_SRCS $SELECT_SRCS $IOCP_SRCS"
+        CORE_SRCS="$WIN32_SRCS $IOCP_SRCS"
         OS_CONFIG="$WIN32_CONFIG"
-        EVENT_MODULES="$EVENT_MODULES $SELECT_MODULE $IOCP_MODULE"
+        EVENT_MODULES="$EVENT_MODULES $IOCP_MODULE"
         EVENT_FOUND=YES
 
+        if [ $EVENT_SELECT = NO ]; then
+            CORE_SRCS="$CORE_SRCS $SELECT_SRCS"
+            EVENT_MODULES="$EVENT_MODULES $SELECT_MODULE"
+        fi
+
         have=HAVE_AIO . auto/have
         have=HAVE_IOCP . auto/have
         CORE_LIBS="$CORE_LIBS ws2_32.lib"
diff --git a/src/core/nginx.c b/src/core/nginx.c
index 766257c..3c5f789 100644
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -140,11 +140,19 @@
 
     cycle = ngx_init_cycle(&init_cycle);
     if (cycle == NULL) {
+        if (ngx_test_config) {
+            ngx_log_error(NGX_LOG_EMERG, log, 0,
+                          "the configuration file %s test failed",
+                          init_cycle.conf_file.data);
+        }
+
         return 1;
     }
 
     if (ngx_test_config) {
-        ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "config syntax is ok");
+        ngx_log_error(NGX_LOG_INFO, log, 0,
+                      "the configuration file %s was tested successfully",
+                      init_cycle.conf_file.data);
         return 0;
     }
 
diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index 94414ae..bde3171 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -138,6 +138,12 @@
         return NULL;
     }
 
+    if (ngx_test_config) {
+        ngx_log_error(NGX_LOG_INFO, log, 0,
+                      "the configuration file %s syntax is ok",
+                      cycle->conf_file.data);
+    }
+
 
     for (i = 0; ngx_modules[i]; i++) {
         if (ngx_modules[i]->type != NGX_CORE_MODULE) {
@@ -274,10 +280,12 @@
 
 #if !(WIN32)
 
-    if (dup2(cycle->log->file->fd, STDERR_FILENO) == NGX_ERROR) {
-        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
-                      "dup2(STDERR) failed");
-        failed = 1;
+    if (!failed && !ngx_test_config) {
+        if (dup2(cycle->log->file->fd, STDERR_FILENO) == NGX_ERROR) {
+            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
+                          "dup2(STDERR) failed");
+            failed = 1;
+        }
     }
 
 #endif
@@ -299,6 +307,11 @@
             }
         }
 
+        if (ngx_test_config) {
+            ngx_destroy_pool(pool);
+            return NULL;
+        }
+
         ls = cycle->listening.elts;
         for (i = 0; i < cycle->listening.nelts; i++) {
             if (ls[i].new && ls[i].fd == -1) {
diff --git a/src/core/ngx_output_chain.c b/src/core/ngx_output_chain.c
index 285bd83..94e4104 100644
--- a/src/core/ngx_output_chain.c
+++ b/src/core/ngx_output_chain.c
@@ -20,7 +20,7 @@
     ngx_chain_t  *cl, *out, **last_out;
 
     /*
-     * the short path for the case when the chain ctx->in is empty
+     * the short path for the case when the ctx->in chain is empty
      * and the incoming chain is empty too or it has the single hunk
      * that does not require the copy
      */
@@ -54,9 +54,14 @@
 
         while (ctx->in) {
 
+            /*
+             * cycle while there are the ctx->in hunks
+             * or there are the free output hunks to copy in
+             */
+
             if (!ngx_output_chain_need_to_copy(ctx, ctx->in->hunk)) {
 
-                /* move the chain link to the chain out */
+                /* move the chain link to the output chain */
 
                 cl = ctx->in;
                 ctx->in = cl->next;
@@ -133,7 +138,7 @@
                 return rc;
             }
 
-            /* delete the completed hunk from the chain ctx->in */
+            /* delete the completed hunk from the ctx->in chain */
 
             if (ngx_hunk_size(ctx->in->hunk) == 0) {
                 ctx->in = ctx->in->next;
@@ -157,6 +162,10 @@
 
         ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
         last_out = &out;
+
+        if (last == NGX_ERROR) {
+            return last;
+        }
     }
 }
 
diff --git a/src/http/modules/ngx_http_gzip_filter.c b/src/http/modules/ngx_http_gzip_filter.c
index 8c22ac6..cf3910c 100644
--- a/src/http/modules/ngx_http_gzip_filter.c
+++ b/src/http/modules/ngx_http_gzip_filter.c
@@ -18,15 +18,19 @@
     int                  level;
     size_t               wbits;
     size_t               memlevel;
+    size_t               min_length;
 } ngx_http_gzip_conf_t;
 
 
-enum {
-    NGX_HTTP_GZIP_PROXIED_OFF = 0,
-    NGX_HTTP_GZIP_PROXIED_NOCACHABLE,
-    NGX_HTTP_GZIP_PROXIED_POOR_CACHABLE,
-    NGX_HTTP_GZIP_PROXIED_ON
-};
+#define NGX_HTTP_GZIP_PROXIED_OFF       0x0002
+#define NGX_HTTP_GZIP_PROXIED_EXPIRED   0x0004
+#define NGX_HTTP_GZIP_PROXIED_NO_CACHE  0x0008
+#define NGX_HTTP_GZIP_PROXIED_NO_STORE  0x0010
+#define NGX_HTTP_GZIP_PROXIED_PRIVATE   0x0020
+#define NGX_HTTP_GZIP_PROXIED_NO_LM     0x0040
+#define NGX_HTTP_GZIP_PROXIED_NO_ETAG   0x0080
+#define NGX_HTTP_GZIP_PROXIED_AUTH      0x0100
+#define NGX_HTTP_GZIP_PROXIED_ANY       0x0200
 
 
 typedef struct {
@@ -37,7 +41,7 @@
     ngx_chain_t        **last_out;
     ngx_hunk_t          *in_hunk;
     ngx_hunk_t          *out_hunk;
-    int                  hunks;
+    ngx_int_t            hunks;
 
     off_t                length;
 
@@ -58,10 +62,11 @@
 } ngx_http_gzip_ctx_t;
 
 
+static int ngx_http_gzip_proxied(ngx_http_request_t *r,
+                                 ngx_http_gzip_conf_t *conf);
 static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
                                         u_int size);
 static void ngx_http_gzip_filter_free(void *opaque, void *address);
-
 ngx_inline static int ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx);
 
 static u_char *ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
@@ -94,11 +99,16 @@
 };
 
 
-static ngx_conf_enum_t  ngx_http_gzip_proxied[] = {
+static ngx_conf_bitmask_t  ngx_http_gzip_proxied_mask[] = {
     { ngx_string("off"), NGX_HTTP_GZIP_PROXIED_OFF },
-    { ngx_string("nocachable"), NGX_HTTP_GZIP_PROXIED_NOCACHABLE },
-    { ngx_string("poor_cachable"), NGX_HTTP_GZIP_PROXIED_POOR_CACHABLE },
-    { ngx_string("on"), NGX_HTTP_GZIP_PROXIED_ON },
+    { ngx_string("expired"), NGX_HTTP_GZIP_PROXIED_EXPIRED },
+    { ngx_string("no-cache"), NGX_HTTP_GZIP_PROXIED_NO_CACHE },
+    { ngx_string("no-store"), NGX_HTTP_GZIP_PROXIED_NO_STORE },
+    { ngx_string("private"), NGX_HTTP_GZIP_PROXIED_PRIVATE },
+    { ngx_string("no_last_modified"), NGX_HTTP_GZIP_PROXIED_NO_LM },
+    { ngx_string("no_etag"), NGX_HTTP_GZIP_PROXIED_NO_ETAG },
+    { ngx_string("auth"), NGX_HTTP_GZIP_PROXIED_AUTH },
+    { ngx_string("any"), NGX_HTTP_GZIP_PROXIED_ANY },
     { ngx_null_string, 0 }
 };
 
@@ -156,10 +166,17 @@
 
     { ngx_string("gzip_proxied"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY,
-      ngx_conf_set_enum_slot,
+      ngx_conf_set_bitmask_slot,
       NGX_HTTP_LOC_CONF_OFFSET,
       offsetof(ngx_http_gzip_conf_t, proxied),
-      &ngx_http_gzip_proxied },
+      &ngx_http_gzip_proxied_mask },
+
+    { ngx_string("gzip_min_length"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_gzip_conf_t, min_length),
+      NULL},
 
       ngx_null_command
 };
@@ -221,7 +238,6 @@
 
 static int ngx_http_gzip_header_filter(ngx_http_request_t *r)
 {
-    time_t                 date, expires;
     ngx_http_gzip_ctx_t   *ctx;
     ngx_http_gzip_conf_t  *conf;
 
@@ -234,6 +250,8 @@
         || (r->headers_out.content_encoding
             && r->headers_out.content_encoding->value.len)
         || r->headers_in.accept_encoding == NULL
+        || (r->headers_out.content_length_n != -1
+            && r->headers_out.content_length_n < conf->min_length)
         || ngx_strstr(r->headers_in.accept_encoding->value.data, "gzip") == NULL
        )
     {
@@ -249,66 +267,15 @@
     }
 
 
-    if (r->headers_in.via && conf->proxied != NGX_HTTP_GZIP_PROXIED_ON) {
-
-        if (conf->proxied == NGX_HTTP_GZIP_PROXIED_OFF) {
+    if (r->headers_in.via) {
+        if (conf->proxied & NGX_HTTP_GZIP_PROXIED_OFF) {
             return ngx_http_next_header_filter(r);
         }
 
-        if (r->headers_out.expires) {
-            expires = ngx_http_parse_time(r->headers_out.expires->value.data,
-                                          r->headers_out.expires->value.len);
-            if (expires == NGX_ERROR) {
-                return ngx_http_next_header_filter(r);
-            }
-
-            if (r->headers_out.date) {
-                date = ngx_http_parse_time(r->headers_out.date->value.data,
-                                           r->headers_out.date->value.len);
-                if (date == NGX_ERROR) {
-                    return ngx_http_next_header_filter(r);
-                }
-
-            } else {
-                date = ngx_cached_time;
-            }
-
-            if (expires >= date) {
-                return ngx_http_next_header_filter(r);
-            }
-
-        } else if (r->headers_out.cache_control) {
-
-            if (conf->proxied == NGX_HTTP_GZIP_PROXIED_NOCACHABLE) {
-                if (ngx_strstr(r->headers_out.cache_control->value.data,
-                               "no-cache") == NULL)
-                {
-                    return ngx_http_next_header_filter(r);
-                }
-
-            } else {  /* NGX_HTTP_GZIP_PROXIED_POOR_CACHABLE */
-
-                /* STUB: should be one cycle for all values */
-
-                if (ngx_strstr(r->headers_out.cache_control->value.data,
-                               "no-cache") == NULL
-                    && ngx_strstr(r->headers_out.cache_control->value.data,
-                                  "private") == NULL
-                    && ngx_strstr(r->headers_out.cache_control->value.data,
-                                  "no-store") == NULL)
-                {
-                    return ngx_http_next_header_filter(r);
-                }
-            }
-
-        } else if (conf->proxied == NGX_HTTP_GZIP_PROXIED_NOCACHABLE) {
+        if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_ANY)
+            && ngx_http_gzip_proxied(r, conf) == NGX_DECLINED)
+        {
             return ngx_http_next_header_filter(r);
-
-        } else {  /* NGX_HTTP_GZIP_PROXIED_POOR_CACHABLE */
-
-            if (r->headers_out.last_modified || r->headers_out.etag) {
-                return ngx_http_next_header_filter(r);
-            }
         }
     }
 
@@ -354,6 +321,89 @@
 }
 
 
+static int ngx_http_gzip_proxied(ngx_http_request_t *r,
+                                 ngx_http_gzip_conf_t *conf)
+{
+    time_t  date, expires;
+
+    if (r->headers_in.authorization
+        && (conf->proxied & NGX_HTTP_GZIP_PROXIED_AUTH))
+    {
+        return NGX_OK;
+    }
+
+    if (r->headers_out.expires) {
+
+        if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_EXPIRED)) {
+            return NGX_DECLINED;
+        }
+
+        expires = ngx_http_parse_time(r->headers_out.expires->value.data,
+                                      r->headers_out.expires->value.len);
+        if (expires == NGX_ERROR) {
+            return NGX_DECLINED;
+        }
+
+        if (r->headers_out.date) {
+            date = ngx_http_parse_time(r->headers_out.date->value.data,
+                                       r->headers_out.date->value.len);
+            if (date == NGX_ERROR) {
+                return NGX_DECLINED;
+            }
+
+        } else {
+            date = ngx_cached_time;
+        }
+
+        if (expires < date) {
+            return NGX_OK;
+        }
+
+        return NGX_DECLINED;
+    }
+
+    if (r->headers_out.cache_control) {
+
+        if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_CACHE)
+            && ngx_strstr(r->headers_out.cache_control->value.data, "no-cache")
+                                                                       == NULL)
+        {
+            return NGX_OK;
+        }
+
+        if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_STORE)
+            && ngx_strstr(r->headers_out.cache_control->value.data, "no-store")
+                                                                       == NULL)
+        {
+            return NGX_OK;
+        }
+
+        if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_PRIVATE)
+            && ngx_strstr(r->headers_out.cache_control->value.data, "private")
+                                                                       == NULL)
+        {
+            return NGX_OK;
+        }
+
+        return NGX_DECLINED;
+    }
+
+    if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_LM)
+        && r->headers_out.last_modified)
+    {
+        return NGX_DECLINED;
+    }
+
+    if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_ETAG)
+        && r->headers_out.etag)
+    {
+        return NGX_DECLINED;
+    }
+
+    return NGX_OK;
+}
+
+
 static int ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
 {
     int                    rc, wbits, memlevel, last;
@@ -770,17 +820,24 @@
                   ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t)),
                   NGX_CONF_ERROR);
 
+    /* set by ngx_pcalloc():
+
+    conf->bufs.num = 0;
+    conf->proxied = 0;
+
+    */
+
+
     conf->enable = NGX_CONF_UNSET;
     conf->no_buffer = NGX_CONF_UNSET;
 
- /* conf->bufs.num = 0; */
 
     conf->http_version = NGX_CONF_UNSET_UINT;
-    conf->proxied = NGX_CONF_UNSET_UINT;
 
     conf->level = NGX_CONF_UNSET;
-    conf->wbits = NGX_CONF_UNSET;
-    conf->memlevel = NGX_CONF_UNSET;
+    conf->wbits = NGX_CONF_UNSET_UINT;
+    conf->memlevel = NGX_CONF_UNSET_UINT;
+    conf->min_length = NGX_CONF_UNSET_UINT;
 
     return conf;
 }
@@ -799,13 +856,15 @@
 
     ngx_conf_merge_unsigned_value(conf->http_version, prev->http_version,
                                   NGX_HTTP_VERSION_11);
-    ngx_conf_merge_unsigned_value(conf->proxied, prev->proxied,
-                                  NGX_HTTP_GZIP_PROXIED_OFF);
+    ngx_conf_merge_bitmask_value(conf->proxied, prev->proxied,
+                                 (NGX_CONF_BITMASK_SET
+                                  |NGX_HTTP_GZIP_PROXIED_OFF));
 
     ngx_conf_merge_value(conf->level, prev->level, 1);
     ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
     ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
                               MAX_MEM_LEVEL - 1);
+    ngx_conf_merge_size_value(conf->min_length, prev->min_length, 0);
     ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
 
     return NGX_CONF_OK;