diff --git a/Makefile.in b/Makefile.in
index 4668b8a6..a12ade44 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -60,11 +60,12 @@ DIST_COMMON = $(am__configure_deps) $(srcdir)/Makefile.am \
 	auto/missing
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \
-	$(top_srcdir)/m4/inet_ntop.m4 $(top_srcdir)/m4/libtool.m4 \
-	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
-	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/polarssl.m4 \
-	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/m4/ax_tls.m4 $(top_srcdir)/m4/inet_ntop.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/openssl.m4 \
+	$(top_srcdir)/m4/polarssl.m4 $(top_srcdir)/libev/libev.m4 \
+	$(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \
diff --git a/aclocal.m4 b/aclocal.m4
index 370bd147..e9136d93 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1163,6 +1163,7 @@ AC_SUBST([am__untar])
 ]) # _AM_PROG_TAR
 
 m4_include([m4/acx_pthread.m4])
+m4_include([m4/ax_tls.m4])
 m4_include([m4/inet_ntop.m4])
 m4_include([m4/libtool.m4])
 m4_include([m4/ltoptions.m4])
diff --git a/config.h.in b/config.h.in
index 9d86b1cc..05098ecb 100644
--- a/config.h.in
+++ b/config.h.in
@@ -298,6 +298,9 @@
 /* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
 #undef TIME_WITH_SYS_TIME
 
+/* If the compiler supports a TLS storage class define it to that here */
+#undef TLS
+
 /* Use Apple CommonCrypto library */
 #undef USE_CRYPTO_APPLECC
 
diff --git a/configure b/configure
index 1d81488e..2d20a848 100755
--- a/configure
+++ b/configure
@@ -12851,6 +12851,60 @@ case $host in
     ;;
 esac
 
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for thread local storage (TLS) class" >&5
+$as_echo_n "checking for thread local storage (TLS) class... " >&6; }
+  if ${ac_cv_tls+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  for ax_tls_keyword in __thread '__declspec(thread)' none; do
+       case $ax_tls_keyword in #(
+  none) :
+    ac_cv_tls=none ; break ;; #(
+  *) :
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+               static void
+               foo(void) {
+               static  $ax_tls_keyword  int bar;
+               exit(1);
+               }
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_tls=$ax_tls_keyword ; break
+else
+  ac_cv_tls=none
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext ;;
+esac
+    done
+
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_tls" >&5
+$as_echo "$ac_cv_tls" >&6; }
+
+  if test "$ac_cv_tls" != "none"; then :
+
+cat >>confdefs.h <<_ACEOF
+#define TLS $ac_cv_tls
+_ACEOF
+
+     :
+else
+  :
+fi
+
+
 case "${with_crypto_library}" in
   openssl)
 
diff --git a/configure.ac b/configure.ac
index 2451466d..07f6654a 100755
--- a/configure.ac
+++ b/configure.ac
@@ -53,6 +53,9 @@ case $host in
     ;;
 esac
 
+dnl Checks for TLS
+AX_TLS([:], [:])
+
 dnl Checks for crypto library
 case "${with_crypto_library}" in
   openssl)
diff --git a/libcork/Makefile.in b/libcork/Makefile.in
index 73c1fea5..596876ad 100644
--- a/libcork/Makefile.in
+++ b/libcork/Makefile.in
@@ -73,11 +73,12 @@ subdir = libcork
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in COPYING
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \
-	$(top_srcdir)/m4/inet_ntop.m4 $(top_srcdir)/m4/libtool.m4 \
-	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
-	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/polarssl.m4 \
-	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/m4/ax_tls.m4 $(top_srcdir)/m4/inet_ntop.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/openssl.m4 \
+	$(top_srcdir)/m4/polarssl.m4 $(top_srcdir)/libev/libev.m4 \
+	$(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
diff --git a/libcork/include/libcork/config/gcc.h b/libcork/include/libcork/config/gcc.h
index d7bbffac..debcbbda 100644
--- a/libcork/include/libcork/config/gcc.h
+++ b/libcork/include/libcork/config/gcc.h
@@ -75,10 +75,10 @@
 #endif
 
 /* Thread-local storage has been available since GCC 3.3, but not on Mac
- * OS X. */
+ * OS X. Also disable TLS for uClibc*/
 
 #if !(defined(__APPLE__) && defined(__MACH__))
-#if CORK_CONFIG_GCC_VERSION >= 30300
+#if CORK_CONFIG_GCC_VERSION >= 30300 && defined(TLS)
 #define CORK_CONFIG_HAVE_THREAD_STORAGE_CLASS  1
 #else
 #define CORK_CONFIG_HAVE_THREAD_STORAGE_CLASS  0
diff --git a/libev/Makefile.in b/libev/Makefile.in
index 1410b1f9..c30edb91 100644
--- a/libev/Makefile.in
+++ b/libev/Makefile.in
@@ -57,11 +57,12 @@ DIST_COMMON = README $(noinst_HEADERS) $(srcdir)/Makefile.am \
 	$(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \
-	$(top_srcdir)/m4/inet_ntop.m4 $(top_srcdir)/m4/libtool.m4 \
-	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
-	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/polarssl.m4 \
-	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/m4/ax_tls.m4 $(top_srcdir)/m4/inet_ntop.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/openssl.m4 \
+	$(top_srcdir)/m4/polarssl.m4 $(top_srcdir)/libev/libev.m4 \
+	$(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
diff --git a/libipset/Makefile.in b/libipset/Makefile.in
index 1ff22d1c..4fc2709a 100644
--- a/libipset/Makefile.in
+++ b/libipset/Makefile.in
@@ -73,11 +73,12 @@ subdir = libipset
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \
-	$(top_srcdir)/m4/inet_ntop.m4 $(top_srcdir)/m4/libtool.m4 \
-	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
-	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/polarssl.m4 \
-	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/m4/ax_tls.m4 $(top_srcdir)/m4/inet_ntop.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/openssl.m4 \
+	$(top_srcdir)/m4/polarssl.m4 $(top_srcdir)/libev/libev.m4 \
+	$(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
diff --git a/libudns/Makefile.in b/libudns/Makefile.in
index ef61149d..da14515d 100644
--- a/libudns/Makefile.in
+++ b/libudns/Makefile.in
@@ -73,11 +73,12 @@ subdir = libudns
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in NEWS TODO
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \
-	$(top_srcdir)/m4/inet_ntop.m4 $(top_srcdir)/m4/libtool.m4 \
-	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
-	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/polarssl.m4 \
-	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/m4/ax_tls.m4 $(top_srcdir)/m4/inet_ntop.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/openssl.m4 \
+	$(top_srcdir)/m4/polarssl.m4 $(top_srcdir)/libev/libev.m4 \
+	$(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
diff --git a/m4/ax_tls.m4 b/m4/ax_tls.m4
new file mode 100644
index 00000000..809b761a
--- /dev/null
+++ b/m4/ax_tls.m4
@@ -0,0 +1,74 @@
+# ===========================================================================
+#          http://www.gnu.org/software/autoconf-archive/ax_tls.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_TLS([action-if-found], [action-if-not-found])
+#
+# DESCRIPTION
+#
+#   Provides a test for the compiler support of thread local storage (TLS)
+#   extensions. Defines TLS if it is found. Currently knows about GCC/ICC
+#   and MSVC. I think SunPro uses the same as GCC, and Borland apparently
+#   supports either.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk>
+#   Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 11
+
+AC_DEFUN([AX_TLS], [
+  AC_MSG_CHECKING([for thread local storage (TLS) class])
+  AC_CACHE_VAL([ac_cv_tls],
+   [for ax_tls_keyword in __thread '__declspec(thread)' none; do
+       AS_CASE([$ax_tls_keyword],
+          [none], [ac_cv_tls=none ; break],
+          [AC_TRY_COMPILE(
+              [#include <stdlib.h>
+               static void
+               foo(void) {
+               static ] $ax_tls_keyword [ int bar;
+               exit(1);
+               }],
+               [],
+               [ac_cv_tls=$ax_tls_keyword ; break],
+               ac_cv_tls=none
+           )])
+    done
+  ])
+  AC_MSG_RESULT([$ac_cv_tls])
+
+  AS_IF([test "$ac_cv_tls" != "none"],
+    [AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class define it to that here])
+     m4_ifnblank([$1],[$1])],
+    [m4_ifnblank([$2],[$2])])
+])
diff --git a/openwrt/Makefile b/openwrt/Makefile
index 6f28bc6c..5b2ee9f4 100644
--- a/openwrt/Makefile
+++ b/openwrt/Makefile
@@ -28,14 +28,14 @@ define Package/shadowsocks-libev
   $(call Package/shadowsocks-libev/Default)
   TITLE+= (OpenSSL)
   VARIANT:=openssl
-  DEPENDS:=+libopenssl
+  DEPENDS:=+libopenssl +libpthread
 endef
 
 define Package/shadowsocks-libev-polarssl
   $(call Package/shadowsocks-libev/Default)
   TITLE+= (PolarSSL)
   VARIANT:=polarssl
-  DEPENDS:=+libpolarssl
+  DEPENDS:=+libpolarssl +libpthread
 endef
 
 define Package/shadowsocks-libev/description
diff --git a/src/Makefile.am b/src/Makefile.am
index 666b23de..73d70936 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,7 @@
 VERSION_INFO = 1:0:0
 
 AM_CFLAGS = -g -O2 -Wall -Werror -Wno-deprecated-declarations -fno-strict-aliasing -std=gnu99 -D_GNU_SOURCE
+AM_CFLAGS += $(PTHREAD_CFLAGS)
 AM_CFLAGS += -I$(top_srcdir)/libev
 AM_CFLAGS += -I$(top_srcdir)/libudns
 AM_CFLAGS += -I$(top_srcdir)/libipset/include
@@ -9,7 +10,8 @@ AM_CFLAGS += -I$(top_srcdir)/libsodium/src/libsodium/include
 
 AM_LDFLAGS = -static
 
-SS_COMMON_LIBS = $(top_builddir)/libev/libev.la \
+SS_COMMON_LIBS = $(PTHREAD_LIBS) \
+				 $(top_builddir)/libev/libev.la \
 				 $(top_builddir)/libipset/libipset.la \
 				 $(top_builddir)/libcork/libcork.la \
 				 $(top_builddir)/libsodium/src/libsodium/libsodium.la \
diff --git a/src/Makefile.in b/src/Makefile.in
index c0ddb6f2..545e103a 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -64,11 +64,12 @@ DIST_COMMON = $(include_HEADERS) $(srcdir)/Makefile.am \
 	$(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/acx_pthread.m4 \
-	$(top_srcdir)/m4/inet_ntop.m4 $(top_srcdir)/m4/libtool.m4 \
-	$(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \
-	$(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \
-	$(top_srcdir)/m4/openssl.m4 $(top_srcdir)/m4/polarssl.m4 \
-	$(top_srcdir)/libev/libev.m4 $(top_srcdir)/configure.ac
+	$(top_srcdir)/m4/ax_tls.m4 $(top_srcdir)/m4/inet_ntop.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/m4/openssl.m4 \
+	$(top_srcdir)/m4/polarssl.m4 $(top_srcdir)/libev/libev.m4 \
+	$(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
@@ -106,7 +107,8 @@ am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(bindir)" \
 	"$(DESTDIR)$(includedir)"
 LTLIBRARIES = $(lib_LTLIBRARIES)
 am__DEPENDENCIES_1 =
-am__DEPENDENCIES_2 = $(top_builddir)/libev/libev.la \
+am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1) \
+	$(top_builddir)/libev/libev.la \
 	$(top_builddir)/libipset/libipset.la \
 	$(top_builddir)/libcork/libcork.la \
 	$(top_builddir)/libsodium/src/libsodium/libsodium.la \
@@ -355,12 +357,13 @@ top_srcdir = @top_srcdir@
 VERSION_INFO = 1:0:0
 AM_CFLAGS = -g -O2 -Wall -Werror -Wno-deprecated-declarations \
 	-fno-strict-aliasing -std=gnu99 -D_GNU_SOURCE \
-	-I$(top_srcdir)/libev -I$(top_srcdir)/libudns \
-	-I$(top_srcdir)/libipset/include \
+	$(PTHREAD_CFLAGS) -I$(top_srcdir)/libev \
+	-I$(top_srcdir)/libudns -I$(top_srcdir)/libipset/include \
 	-I$(top_srcdir)/libcork/include \
 	-I$(top_srcdir)/libsodium/src/libsodium/include
 AM_LDFLAGS = -static
-SS_COMMON_LIBS = $(top_builddir)/libev/libev.la \
+SS_COMMON_LIBS = $(PTHREAD_LIBS) \
+				 $(top_builddir)/libev/libev.la \
 				 $(top_builddir)/libipset/libipset.la \
 				 $(top_builddir)/libcork/libcork.la \
 				 $(top_builddir)/libsodium/src/libsodium/libsodium.la \