--- ./src/configure.in.ORIGIN	2017-08-24 12:08:53 +0200
+++ ./src/configure.in	2017-08-24 12:09:28 +0200
@@ -323,7 +323,7 @@
   if test x$have_lib_ssl = xtrue ; then
     AC_DEFINE(TLS_IMPL_OPENSSL,1,[Define if TLS implementation is OpenSSL])
     AC_MSG_RESULT([yes])
-    TLS_IMPL_LIBS="-lssl -lcrypto"
+    TLS_IMPL_LIBS="-lssl -lcrypto -lpthreads"
     TLS_IMPL=openssl
     AC_MSG_NOTICE([TLS module will use OpenSSL])
   else
--- ./src/configure.ORIGIN	2017-08-24 12:09:01 +0200
+++ ./src/configure	2017-08-24 12:09:35 +0200
@@ -8746,7 +8746,7 @@
 
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-    TLS_IMPL_LIBS="-lssl -lcrypto"
+    TLS_IMPL_LIBS="-lssl -lcrypto -lpthreads"
     TLS_IMPL=openssl
     { $as_echo "$as_me:${as_lineno-$LINENO}: TLS module will use OpenSSL" >&5
 $as_echo "$as_me: TLS module will use OpenSSL" >&6;}