diff -wbBur libsieve-2.3.1/Makefile.am libsieve-2.3.1.my/Makefile.am
--- libsieve-2.3.1/Makefile.am	2012-05-14 15:20:06.000000000 +0400
+++ libsieve-2.3.1.my/Makefile.am	2013-09-02 19:24:34.474741233 +0400
@@ -5,7 +5,6 @@
 
 EXTRA_DIST              = libsieve.pc.in \
 	src/sv_parser/addr.h src/sv_parser/addr-lex.h src/sv_parser/header.h src/sv_parser/header-lex.h src/sv_parser/sieve.h src/sv_parser/sieve-lex.h \
-	src/sv_regex/README src/sv_regex/regcomp.c src/sv_regex/regexec.c src/sv_regex/regex_internal.c src/sv_regex/regex_internal.h \
 	src/sv_test/lmtp-1 src/sv_test/lmtp-2 src/sv_test/messagea.mbox src/sv_test/messageb.mbox src/sv_test/messagec.mbox src/sv_test/messaged.mbox src/sv_test/messagef.mbox src/sv_test/messageg.mbox src/sv_test/messageh.mbox src/sv_test/messagei.mbox src/sv_test/messagej.mbox src/sv_test/messagek.mbox src/sv_test/script10.sv src/sv_test/script11.sv src/sv_test/script12.sv src/sv_test/script13.sv src/sv_test/script14.sv src/sv_test/script15.sv src/sv_test/script16.sv src/sv_test/script17.sv src/sv_test/script18.sv src/sv_test/script19.sv src/sv_test/script1.sv src/sv_test/script20.sv src/sv_test/script21.sv src/sv_test/script22.sv src/sv_test/script23.sv src/sv_test/script2.sv src/sv_test/script3.sv src/sv_test/script4.sv src/sv_test/script5.sv src/sv_test/script6.sv src/sv_test/script7.sv src/sv_test/script8.sv src/sv_test/script9.sv src/sv_test/testmessage.sh src/sv_test/testvalid.sh
 pkgconfigdir            = $(libdir)/pkgconfig
 pkgconfig_DATA          = libsieve.pc
@@ -24,7 +23,6 @@
 src_libsieve_la_SOURCES      = \
 	src/sv_interface/callbacks2.c src/sv_interface/callbacks2.h src/sv_interface/context2.c src/sv_interface/context2.h src/sv_interface/message2.c src/sv_interface/message2.h src/sv_interface/message.c src/sv_interface/message.h src/sv_interface/script2.c src/sv_interface/script.c src/sv_interface/script.h src/sv_interface/tree.c src/sv_interface/tree.h \
 	src/sv_parser/addrinc.h src/sv_parser/addr.y src/sv_parser/addr-lex.l src/sv_parser/comparator.c src/sv_parser/comparator.h src/sv_parser/headerinc.h src/sv_parser/header.y src/sv_parser/header-lex.l src/sv_parser/parser.h src/sv_parser/sieveinc.h src/sv_parser/sieve.y src/sv_parser/sieve-lex.l \
-	src/sv_regex/regex.h src/sv_regex/regex.c \
 	src/sv_util/exception.c src/sv_util/exception.h src/sv_util/md5.c src/sv_util/util.c src/sv_util/util.h
 
 dist-hook:
diff -wbBur libsieve-2.3.1/src/sv_interface/tree.h libsieve-2.3.1.my/src/sv_interface/tree.h
--- libsieve-2.3.1/src/sv_interface/tree.h	2012-05-14 15:20:06.000000000 +0400
+++ libsieve-2.3.1.my/src/sv_interface/tree.h	2013-09-02 19:23:48.351408431 +0400
@@ -29,7 +29,7 @@
 #define TREE_H
 
 #include "src/sv_parser/comparator.h"
-#include "src/sv_regex/regex.h"
+#include <regex.h>
 
 
 /* abstract syntax tree for sieve */
diff -wbBur libsieve-2.3.1/src/sv_parser/comparator.c libsieve-2.3.1.my/src/sv_parser/comparator.c
--- libsieve-2.3.1/src/sv_parser/comparator.c	2012-05-14 15:20:06.000000000 +0400
+++ libsieve-2.3.1.my/src/sv_parser/comparator.c	2013-09-02 19:25:13.368074118 +0400
@@ -127,7 +127,7 @@
 
 static int octet_regex(struct sieve2_context *context, const char *pat, const char *text)
 {
-    return (!libsieve_regexec((const regex_t *)pat, text, 0, NULL, 0));
+    return (!regexec((const regex_t *)pat, text, 0, NULL, 0));
 }
 
 
diff -wbBur libsieve-2.3.1/src/sv_parser/comparator.h libsieve-2.3.1.my/src/sv_parser/comparator.h
--- libsieve-2.3.1/src/sv_parser/comparator.h	2012-05-14 15:20:06.000000000 +0400
+++ libsieve-2.3.1.my/src/sv_parser/comparator.h	2013-09-02 19:23:27.671408659 +0400
@@ -27,7 +27,7 @@
 #ifndef COMPARATOR_H
 #define COMPARATOR_H
 
-#include "src/sv_regex/regex.h"
+#include <regex.h>
 #include "src/sv_include/sieve2.h"
 
 /* compares pat to text; returns 1 if it's true, 0 otherwise 
diff -wbBur libsieve-2.3.1/src/sv_parser/sieve.y libsieve-2.3.1.my/src/sv_parser/sieve.y
--- libsieve-2.3.1/src/sv_parser/sieve.y	2012-05-31 13:16:50.000000000 +0400
+++ libsieve-2.3.1.my/src/sv_parser/sieve.y	2013-09-02 19:25:53.704740324 +0400
@@ -34,8 +34,7 @@
 #include <string.h>
 #include <ctype.h>
 
-/* sv_regex */
-#include "src/sv_regex/regex.h"
+#include <regex.h>
 
 /* sv_parser */
 #include "comparator.h"
@@ -882,8 +881,8 @@
     char errbuf[100];
     regex_t *reg = (regex_t *) libsieve_malloc(sizeof(regex_t));
 
-    if ((ret = libsieve_regcomp(reg, s, cflags)) != 0) {
-	(void) libsieve_regerror(ret, reg, errbuf, sizeof(errbuf));
+    if ((ret = regcomp(reg, s, cflags)) != 0) {
+	(void) regerror(ret, reg, errbuf, sizeof(errbuf));
 	libsieve_sieveerror(context, context->sieve_scan, errbuf);
 	libsieve_free(reg);
 	return NULL;