diff --git a/configure b/configure
index b8636ab5c..767a1d1d5 100755
--- a/configure
+++ b/configure
@@ -1,11 +1,12 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.70 for qbittorrent v4.4.0alpha.
+# Generated by GNU Autoconf 2.71 for qbittorrent v4.4.0alpha.
 #
 # Report bugs to <bugs.qbittorrent.org>.
 #
 #
-# Copyright (C) 1992-1996, 1998-2017, 2020 Free Software Foundation, Inc.
+# Copyright (C) 1992-1996, 1998-2017, 2020-2021 Free Software Foundation,
+# Inc.
 #
 #
 # This configure script is free software; the Free Software Foundation
@@ -637,7 +638,6 @@ openssl_LIBS
 openssl_CFLAGS
 libtorrent_LIBS
 libtorrent_CFLAGS
-BOOST_SYSTEM_LIB
 BOOST_LDFLAGS
 BOOST_CPPFLAGS
 Qt5Svg_LIBS
@@ -757,7 +757,6 @@ enable_webui
 enable_qt_dbus
 with_boost
 with_boost_libdir
-with_boost_system
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1435,10 +1434,6 @@ Optional Packages:
                           this parameter only if default library detection
                           fails and you know exactly where your boost
                           libraries are located.
-  --with-boost-system[=special-lib]
-                          use the System library from boost - it is possible
-                          to specify a certain library for the linker e.g.
-                          --with-boost-system=boost_system-gcc-mt
 
 Some influential environment variables:
   CC          C compiler command
@@ -1539,9 +1534,9 @@ test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
 qbittorrent configure v4.4.0alpha
-generated by GNU Autoconf 2.70
+generated by GNU Autoconf 2.71
 
-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2021 Free Software Foundation, Inc.
 This configure script is free software; the Free Software Foundation
 gives unlimited permission to copy, distribute and modify it.
 _ACEOF
@@ -1629,53 +1624,6 @@ fi
   as_fn_set_status $ac_retval
 
 } # ac_fn_cxx_try_compile
-
-# ac_fn_cxx_try_link LINENO
-# -------------------------
-# Try to link conftest.$ac_ext, and return whether this succeeded.
-ac_fn_cxx_try_link ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  rm -f conftest.$ac_objext conftest.beam conftest$ac_exeext
-  if { { ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-printf "%s\n" "$ac_try_echo"; } >&5
-  (eval "$ac_link") 2>conftest.err
-  ac_status=$?
-  if test -s conftest.err; then
-    grep -v '^ *+' conftest.err >conftest.er1
-    cat conftest.er1 >&5
-    mv -f conftest.er1 conftest.err
-  fi
-  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; } && {
-	 test -z "$ac_cxx_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest$ac_exeext && {
-	 test "$cross_compiling" = yes ||
-	 test -x conftest$ac_exeext
-       }
-then :
-  ac_retval=0
-else $as_nop
-  printf "%s\n" "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	ac_retval=1
-fi
-  # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
-  # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
-  # interfere with the next link command; also delete a directory that is
-  # left behind by Apple's compiler.  We do this before executing the actions.
-  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
-  as_fn_set_status $ac_retval
-
-} # ac_fn_cxx_try_link
 ac_configure_args_raw=
 for ac_arg
 do
@@ -1701,7 +1649,7 @@ This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
 It was created by qbittorrent $as_me v4.4.0alpha, which was
-generated by GNU Autoconf 2.70.  Invocation command line was
+generated by GNU Autoconf 2.71.  Invocation command line was
 
   $ $0$ac_configure_args_raw
 
@@ -3515,7 +3463,10 @@ else
     CFLAGS=
   fi
 fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C11 features" >&5
+ac_prog_cc_stdc=no
+if test x$ac_prog_cc_stdc = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C11 features" >&5
 printf %s "checking for $CC option to enable C11 features... " >&6; }
 if test ${ac_cv_prog_cc_c11+y}
 then :
@@ -3539,28 +3490,28 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam
 done
 rm -f conftest.$ac_ext
 CC=$ac_save_CC
-
 fi
-# AC_CACHE_VAL
-ac_prog_cc_stdc_options=
-case "x$ac_cv_prog_cc_c11" in #(
-  x) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
-printf "%s\n" "none needed" >&6; } ;; #(
-  xno) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
-printf "%s\n" "unsupported" >&6; } ;; #(
-  *) :
-    ac_prog_cc_stdc_options=" $ac_cv_prog_cc_c11"
-    CC="$CC$ac_prog_cc_stdc_options"
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c11" >&5
-printf "%s\n" "$ac_cv_prog_cc_c11" >&6; } ;;
-esac
-if test "x$ac_cv_prog_cc_c11" != xno
+
+if test "x$ac_cv_prog_cc_c11" = xno
 then :
-  ac_prog_cc_stdc=c11
-		 ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c11
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
+else $as_nop
+  if test "x$ac_cv_prog_cc_c11" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
 else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c11" >&5
+printf "%s\n" "$ac_cv_prog_cc_c11" >&6; }
+     CC="$CC $ac_cv_prog_cc_c11"
+fi
+  ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c11
+  ac_prog_cc_stdc=c11
+fi
+fi
+if test x$ac_prog_cc_stdc = xno
+then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C99 features" >&5
 printf %s "checking for $CC option to enable C99 features... " >&6; }
 if test ${ac_cv_prog_cc_c99+y}
@@ -3571,9 +3522,9 @@ else $as_nop
 ac_save_CC=$CC
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-$ac_c_conftest_c89_program
+$ac_c_conftest_c99_program
 _ACEOF
-for ac_arg in '' -std=gnu99 -std=c99 -c99 -AC99 -D_STDC_C99= -qlanglvl=extc1x -qlanglvl=extc99
+for ac_arg in '' -std=gnu99 -std=c99 -c99 -qlanglvl=extc1x -qlanglvl=extc99 -AC99 -D_STDC_C99=
 do
   CC="$ac_save_CC $ac_arg"
   if ac_fn_c_try_compile "$LINENO"
@@ -3585,28 +3536,28 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam
 done
 rm -f conftest.$ac_ext
 CC=$ac_save_CC
-
 fi
-# AC_CACHE_VAL
-ac_prog_cc_stdc_options=
-case "x$ac_cv_prog_cc_c99" in #(
-  x) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
-printf "%s\n" "none needed" >&6; } ;; #(
-  xno) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
-printf "%s\n" "unsupported" >&6; } ;; #(
-  *) :
-    ac_prog_cc_stdc_options=" $ac_cv_prog_cc_c99"
-    CC="$CC$ac_prog_cc_stdc_options"
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c99" >&5
-printf "%s\n" "$ac_cv_prog_cc_c99" >&6; } ;;
-esac
-if test "x$ac_cv_prog_cc_c99" != xno
+
+if test "x$ac_cv_prog_cc_c99" = xno
 then :
-  ac_prog_cc_stdc=c99
-		    ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
 else $as_nop
+  if test "x$ac_cv_prog_cc_c99" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c99" >&5
+printf "%s\n" "$ac_cv_prog_cc_c99" >&6; }
+     CC="$CC $ac_cv_prog_cc_c99"
+fi
+  ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99
+  ac_prog_cc_stdc=c99
+fi
+fi
+if test x$ac_prog_cc_stdc = xno
+then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C89 features" >&5
 printf %s "checking for $CC option to enable C89 features... " >&6; }
 if test ${ac_cv_prog_cc_c89+y}
@@ -3619,8 +3570,7 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 $ac_c_conftest_c89_program
 _ACEOF
-for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std \
-	-Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
 do
   CC="$ac_save_CC $ac_arg"
   if ac_fn_c_try_compile "$LINENO"
@@ -3632,34 +3582,25 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam
 done
 rm -f conftest.$ac_ext
 CC=$ac_save_CC
-
 fi
-# AC_CACHE_VAL
-ac_prog_cc_stdc_options=
-case "x$ac_cv_prog_cc_c89" in #(
-  x) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
-printf "%s\n" "none needed" >&6; } ;; #(
-  xno) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
-printf "%s\n" "unsupported" >&6; } ;; #(
-  *) :
-    ac_prog_cc_stdc_options=" $ac_cv_prog_cc_c89"
-    CC="$CC$ac_prog_cc_stdc_options"
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
-printf "%s\n" "$ac_cv_prog_cc_c89" >&6; } ;;
-esac
-if test "x$ac_cv_prog_cc_c89" != xno
+
+if test "x$ac_cv_prog_cc_c89" = xno
 then :
-  ac_prog_cc_stdc=c89
-		       ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c89
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
+else $as_nop
+  if test "x$ac_cv_prog_cc_c89" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
 else $as_nop
-  ac_prog_cc_stdc=no
-		       ac_cv_prog_cc_stdc=no
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
+printf "%s\n" "$ac_cv_prog_cc_c89" >&6; }
+     CC="$CC $ac_cv_prog_cc_c89"
 fi
-
+  ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c89
+  ac_prog_cc_stdc=c89
 fi
-
 fi
 
 ac_ext=c
@@ -4009,19 +3950,22 @@ else
     CXXFLAGS=
   fi
 fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++11 features" >&5
+ac_prog_cxx_stdcxx=no
+if test x$ac_prog_cxx_stdcxx = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++11 features" >&5
 printf %s "checking for $CXX option to enable C++11 features... " >&6; }
-if test ${ac_cv_prog_cxx_cxx11+y}
+if test ${ac_cv_prog_cxx_11+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
-  ac_cv_prog_cxx_cxx11=no
+  ac_cv_prog_cxx_11=no
 ac_save_CXX=$CXX
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 $ac_cxx_conftest_cxx11_program
 _ACEOF
-for ac_arg in '' -std=gnu++11 -std=c++11 -std=gnu++0x -std=c++0x -qlanglvl=extended0x -AA
+for ac_arg in '' -std=gnu++11 -std=gnu++0x -std=c++11 -std=c++0x -qlanglvl=extended0x -AA
 do
   CXX="$ac_save_CXX $ac_arg"
   if ac_fn_cxx_try_compile "$LINENO"
@@ -4033,36 +3977,35 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam
 done
 rm -f conftest.$ac_ext
 CXX=$ac_save_CXX
-
 fi
-# AC_CACHE_VAL
-ac_prog_cxx_stdcxx_options=
-case "x$ac_cv_prog_cxx_cxx11" in #(
-  x) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
-printf "%s\n" "none needed" >&6; } ;; #(
-  xno) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
-printf "%s\n" "unsupported" >&6; } ;; #(
-  *) :
-    ac_prog_cxx_stdcxx_options=" $ac_cv_prog_cxx_cxx11"
-    CXX=$CXX$ac_prog_cxx_stdcxx_options
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_cxx11" >&5
-printf "%s\n" "$ac_cv_prog_cxx_cxx11" >&6; } ;;
-esac
-if test "x$ac_cv_prog_cxx_cxx11" != xno
+
+if test "x$ac_cv_prog_cxx_cxx11" = xno
 then :
-  ac_prog_cxx_stdcxx=cxx11
-		    ac_cv_prog_cxx_stdcxx=$ac_cv_prog_cxx_cxx11
-		    ac_cv_prog_cxx_cxx98=$ac_cv_prog_cxx_cxx11
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
 else $as_nop
+  if test "x$ac_cv_prog_cxx_cxx11" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
+else $as_nop
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_cxx11" >&5
+printf "%s\n" "$ac_cv_prog_cxx_cxx11" >&6; }
+     CXX="$CXX $ac_cv_prog_cxx_cxx11"
+fi
+  ac_cv_prog_cxx_stdcxx=$ac_cv_prog_cxx_cxx11
+  ac_prog_cxx_stdcxx=cxx11
+fi
+fi
+if test x$ac_prog_cxx_stdcxx = xno
+then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++98 features" >&5
 printf %s "checking for $CXX option to enable C++98 features... " >&6; }
-if test ${ac_cv_prog_cxx_cxx98+y}
+if test ${ac_cv_prog_cxx_98+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
-  ac_cv_prog_cxx_cxx98=no
+  ac_cv_prog_cxx_98=no
 ac_save_CXX=$CXX
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -4080,32 +4023,25 @@ rm -f core conftest.err conftest.$ac_objext conftest.beam
 done
 rm -f conftest.$ac_ext
 CXX=$ac_save_CXX
-
 fi
-# AC_CACHE_VAL
-ac_prog_cxx_stdcxx_options=
-case "x$ac_cv_prog_cxx_cxx98" in #(
-  x) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
-printf "%s\n" "none needed" >&6; } ;; #(
-  xno) :
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
-printf "%s\n" "unsupported" >&6; } ;; #(
-  *) :
-    ac_prog_cxx_stdcxx_options=" $ac_cv_prog_cxx_cxx98"
-    CXX=$CXX$ac_prog_cxx_stdcxx_options
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_cxx98" >&5
-printf "%s\n" "$ac_cv_prog_cxx_cxx98" >&6; } ;;
-esac
-if test "x$ac_cv_prog_cxx_cxx98" != xno
+
+if test "x$ac_cv_prog_cxx_cxx98" = xno
 then :
-  ac_prog_cxx_stdcxx=cxx98
-		        ac_cv_prog_cxx_stdcxx=$ac_cv_prog_cxx_cxx98
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
+else $as_nop
+  if test "x$ac_cv_prog_cxx_cxx98" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
 else $as_nop
-  ac_prog_cxx_stdcxx=no
-		        ac_cv_prog_cxx_stdcxx=no
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cxx_cxx98" >&5
+printf "%s\n" "$ac_cv_prog_cxx_cxx98" >&6; }
+     CXX="$CXX $ac_cv_prog_cxx_cxx98"
+fi
+  ac_cv_prog_cxx_stdcxx=$ac_cv_prog_cxx_cxx98
+  ac_prog_cxx_stdcxx=cxx98
 fi
-
 fi
 
 ac_ext=c
@@ -4450,12 +4386,7 @@ program_transform_name=`printf "%s\n" "$program_transform_name" | sed "$ac_scrip
 
 
   if test x"${MISSING+set}" != xset; then
-  case $am_aux_dir in
-  *\ * | *\	*)
-    MISSING="\${SHELL} \"$am_aux_dir/missing\"" ;;
-  *)
-    MISSING="\${SHELL} $am_aux_dir/missing" ;;
-  esac
+  MISSING="\${SHELL} '$am_aux_dir/missing'"
 fi
 # Use eval to expand $SHELL
 if eval "$MISSING --is-lightweight"; then
@@ -6100,252 +6031,6 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
 
 
-
-# Check whether --with-boost-system was given.
-if test ${with_boost_system+y}
-then :
-  withval=$with_boost_system;
-        if test "$withval" = "no"; then
-			want_boost="no"
-        elif test "$withval" = "yes"; then
-            want_boost="yes"
-            ax_boost_user_system_lib=""
-        else
-		    want_boost="yes"
-		ax_boost_user_system_lib="$withval"
-		fi
-
-else $as_nop
-  want_boost="yes"
-
-fi
-
-
-	if test "x$want_boost" = "xyes"; then
-
-
-		CPPFLAGS_SAVED="$CPPFLAGS"
-		CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-		export CPPFLAGS
-
-		LDFLAGS_SAVED="$LDFLAGS"
-		LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
-		export LDFLAGS
-
-        { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the Boost::System library is available" >&5
-printf %s "checking whether the Boost::System library is available... " >&6; }
-if test ${ax_cv_boost_system+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  ac_ext=cpp
-ac_cpp='$CXXCPP $CPPFLAGS'
-ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
-
-			 CXXFLAGS_SAVE=$CXXFLAGS
-			 CXXFLAGS=
-
-			 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <boost/system/error_code.hpp>
-int
-main (void)
-{
-boost::system::error_category *a = 0;
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_compile "$LINENO"
-then :
-  ax_cv_boost_system=yes
-else $as_nop
-  ax_cv_boost_system=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-			 CXXFLAGS=$CXXFLAGS_SAVE
-             ac_ext=cpp
-ac_cpp='$CXXCPP $CPPFLAGS'
-ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
-
-
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_boost_system" >&5
-printf "%s\n" "$ax_cv_boost_system" >&6; }
-		if test "x$ax_cv_boost_system" = "xyes"; then
-
-
-
-printf "%s\n" "#define HAVE_BOOST_SYSTEM /**/" >>confdefs.h
-
-            BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/[^\/]*//'`
-
-			LDFLAGS_SAVE=$LDFLAGS
-            if test "x$ax_boost_user_system_lib" = "x"; then
-                for libextension in `ls -r $BOOSTLIBDIR/libboost_system* 2>/dev/null | sed 's,.*/lib,,' | sed 's,\..*,,'` ; do
-                     ax_lib=${libextension}
-				    as_ac_Lib=`printf "%s\n" "ac_cv_lib_$ax_lib""_exit" | $as_tr_sh`
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for exit in -l$ax_lib" >&5
-printf %s "checking for exit in -l$ax_lib... " >&6; }
-if eval test \${$as_ac_Lib+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-l$ax_lib  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-namespace conftest {
-  extern "C" int exit ();
-}
-int
-main (void)
-{
-return conftest::exit ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_link "$LINENO"
-then :
-  eval "$as_ac_Lib=yes"
-else $as_nop
-  eval "$as_ac_Lib=no"
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-eval ac_res=\$$as_ac_Lib
-	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-printf "%s\n" "$ac_res" >&6; }
-if eval test \"x\$"$as_ac_Lib"\" = x"yes"
-then :
-  BOOST_SYSTEM_LIB="-l$ax_lib";  link_system="yes"; break
-else $as_nop
-  link_system="no"
-fi
-
-				done
-                if test "x$link_system" != "xyes"; then
-                for libextension in `ls -r $BOOSTLIBDIR/boost_system* 2>/dev/null | sed 's,.*/,,' | sed -e 's,\..*,,'` ; do
-                     ax_lib=${libextension}
-				    as_ac_Lib=`printf "%s\n" "ac_cv_lib_$ax_lib""_exit" | $as_tr_sh`
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for exit in -l$ax_lib" >&5
-printf %s "checking for exit in -l$ax_lib... " >&6; }
-if eval test \${$as_ac_Lib+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-l$ax_lib  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-namespace conftest {
-  extern "C" int exit ();
-}
-int
-main (void)
-{
-return conftest::exit ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_link "$LINENO"
-then :
-  eval "$as_ac_Lib=yes"
-else $as_nop
-  eval "$as_ac_Lib=no"
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-eval ac_res=\$$as_ac_Lib
-	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-printf "%s\n" "$ac_res" >&6; }
-if eval test \"x\$"$as_ac_Lib"\" = x"yes"
-then :
-  BOOST_SYSTEM_LIB="-l$ax_lib";  link_system="yes"; break
-else $as_nop
-  link_system="no"
-fi
-
-				done
-                fi
-
-            else
-               for ax_lib in $ax_boost_user_system_lib boost_system-$ax_boost_user_system_lib; do
-				      as_ac_Lib=`printf "%s\n" "ac_cv_lib_$ax_lib""_exit" | $as_tr_sh`
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for exit in -l$ax_lib" >&5
-printf %s "checking for exit in -l$ax_lib... " >&6; }
-if eval test \${$as_ac_Lib+y}
-then :
-  printf %s "(cached) " >&6
-else $as_nop
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-l$ax_lib  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-namespace conftest {
-  extern "C" int exit ();
-}
-int
-main (void)
-{
-return conftest::exit ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_cxx_try_link "$LINENO"
-then :
-  eval "$as_ac_Lib=yes"
-else $as_nop
-  eval "$as_ac_Lib=no"
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-eval ac_res=\$$as_ac_Lib
-	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-printf "%s\n" "$ac_res" >&6; }
-if eval test \"x\$"$as_ac_Lib"\" = x"yes"
-then :
-  BOOST_SYSTEM_LIB="-l$ax_lib";  link_system="yes"; break
-else $as_nop
-  link_system="no"
-fi
-
-                  done
-
-            fi
-            if test "x$ax_lib" = "x"; then
-                as_fn_error $? "Could not find a version of the Boost::System library!" "$LINENO" 5
-            fi
-			if test "x$link_system" = "xno"; then
-				as_fn_error $? "Could not link against $ax_lib !" "$LINENO" 5
-			fi
-		fi
-
-		CPPFLAGS="$CPPFLAGS_SAVED"
-	LDFLAGS="$LDFLAGS_SAVED"
-	fi
-
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: Boost.System LIB: \"$BOOST_SYSTEM_LIB\"" >&5
-printf "%s\n" "$as_me: Boost.System LIB: \"$BOOST_SYSTEM_LIB\"" >&6;}
-LIBS="$BOOST_SYSTEM_LIB $LIBS"
-
-
 pkg_failed=no
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libtorrent" >&5
 printf %s "checking for libtorrent... " >&6; }
@@ -6397,14 +6082,14 @@ else
         _pkg_short_errors_supported=no
 fi
         if test $_pkg_short_errors_supported = yes; then
-                libtorrent_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "libtorrent-rasterbar >= 1.2.13" 2>&1`
+	        libtorrent_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "libtorrent-rasterbar >= 1.2.13" 2>&1`
         else
-                libtorrent_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "libtorrent-rasterbar >= 1.2.13" 2>&1`
+	        libtorrent_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "libtorrent-rasterbar >= 1.2.13" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$libtorrent_PKG_ERRORS" >&5
 
-        as_fn_error $? "Package requirements (libtorrent-rasterbar >= 1.2.13) were not met:
+	as_fn_error $? "Package requirements (libtorrent-rasterbar >= 1.2.13) were not met:
 
 $libtorrent_PKG_ERRORS
 
@@ -7402,7 +7087,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # values after options handling.
 ac_log="
 This file was extended by qbittorrent $as_me v4.4.0alpha, which was
-generated by GNU Autoconf 2.70.  Invocation command line was
+generated by GNU Autoconf 2.71.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
   CONFIG_HEADERS  = $CONFIG_HEADERS
@@ -7462,10 +7147,10 @@ cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
 qbittorrent config.status v4.4.0alpha
-configured by $0, generated by GNU Autoconf 2.70,
+configured by $0, generated by GNU Autoconf 2.71,
   with options \\"\$ac_cs_config\\"
 
-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2021 Free Software Foundation, Inc.
 This config.status script is free software; the Free Software Foundation
 gives unlimited permission to copy, distribute and modify it."
 
diff --git a/configure.ac b/configure.ac
index eb179fca7..5d84b41a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -175,10 +175,6 @@ m4_define([DETECT_BOOST_VERSION_PROGRAM],
 AC_COMPILE_IFELSE([DETECT_BOOST_VERSION_PROGRAM(106000)], [],
     [QBT_ADD_DEFINES="$QBT_ADD_DEFINES BOOST_NO_CXX11_RVALUE_REFERENCES"])
 
-AX_BOOST_SYSTEM()
-AC_MSG_NOTICE([Boost.System LIB: "$BOOST_SYSTEM_LIB"])
-LIBS="$BOOST_SYSTEM_LIB $LIBS"
-
 PKG_CHECK_MODULES(libtorrent,
                   [libtorrent-rasterbar >= 1.2.13],
                   [CXXFLAGS="$libtorrent_CFLAGS $CXXFLAGS"
diff --git a/m4/ax_boost_system.m4 b/m4/ax_boost_system.m4
deleted file mode 100644
index 323e2a676..000000000
--- a/m4/ax_boost_system.m4
+++ /dev/null
@@ -1,121 +0,0 @@
-# ===========================================================================
-#     https://www.gnu.org/software/autoconf-archive/ax_boost_system.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_BOOST_SYSTEM
-#
-# DESCRIPTION
-#
-#   Test for System library from the Boost C++ libraries. The macro requires
-#   a preceding call to AX_BOOST_BASE. Further documentation is available at
-#   <http://randspringer.de/boost/index.html>.
-#
-#   This macro calls:
-#
-#     AC_SUBST(BOOST_SYSTEM_LIB)
-#
-#   And sets:
-#
-#     HAVE_BOOST_SYSTEM
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
-#   Copyright (c) 2008 Michael Tindal
-#   Copyright (c) 2008 Daniel Casimiro <dan.casimiro@gmail.com>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 20
-
-AC_DEFUN([AX_BOOST_SYSTEM],
-[
-	AC_ARG_WITH([boost-system],
-	AS_HELP_STRING([--with-boost-system@<:@=special-lib@:>@],
-                   [use the System library from boost - it is possible to specify a certain library for the linker
-                        e.g. --with-boost-system=boost_system-gcc-mt ]),
-        [
-        if test "$withval" = "no"; then
-			want_boost="no"
-        elif test "$withval" = "yes"; then
-            want_boost="yes"
-            ax_boost_user_system_lib=""
-        else
-		    want_boost="yes"
-		ax_boost_user_system_lib="$withval"
-		fi
-        ],
-        [want_boost="yes"]
-	)
-
-	if test "x$want_boost" = "xyes"; then
-        AC_REQUIRE([AC_PROG_CC])
-        AC_REQUIRE([AC_CANONICAL_BUILD])
-		CPPFLAGS_SAVED="$CPPFLAGS"
-		CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-		export CPPFLAGS
-
-		LDFLAGS_SAVED="$LDFLAGS"
-		LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
-		export LDFLAGS
-
-        AC_CACHE_CHECK(whether the Boost::System library is available,
-					   ax_cv_boost_system,
-        [AC_LANG_PUSH([C++])
-			 CXXFLAGS_SAVE=$CXXFLAGS
-			 CXXFLAGS=
-
-			 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/system/error_code.hpp>]],
-				    [[boost::system::error_category *a = 0;]])],
-                   ax_cv_boost_system=yes, ax_cv_boost_system=no)
-			 CXXFLAGS=$CXXFLAGS_SAVE
-             AC_LANG_POP([C++])
-		])
-		if test "x$ax_cv_boost_system" = "xyes"; then
-			AC_SUBST(BOOST_CPPFLAGS)
-
-			AC_DEFINE(HAVE_BOOST_SYSTEM,,[define if the Boost::System library is available])
-            BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
-
-			LDFLAGS_SAVE=$LDFLAGS
-            if test "x$ax_boost_user_system_lib" = "x"; then
-                for libextension in `ls -r $BOOSTLIBDIR/libboost_system* 2>/dev/null | sed 's,.*/lib,,' | sed 's,\..*,,'` ; do
-                     ax_lib=${libextension}
-				    AC_CHECK_LIB($ax_lib, exit,
-                                 [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
-                                 [link_system="no"])
-				done
-                if test "x$link_system" != "xyes"; then
-                for libextension in `ls -r $BOOSTLIBDIR/boost_system* 2>/dev/null | sed 's,.*/,,' | sed -e 's,\..*,,'` ; do
-                     ax_lib=${libextension}
-				    AC_CHECK_LIB($ax_lib, exit,
-                                 [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
-                                 [link_system="no"])
-				done
-                fi
-
-            else
-               for ax_lib in $ax_boost_user_system_lib boost_system-$ax_boost_user_system_lib; do
-				      AC_CHECK_LIB($ax_lib, exit,
-                                   [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
-                                   [link_system="no"])
-                  done
-
-            fi
-            if test "x$ax_lib" = "x"; then
-                AC_MSG_ERROR(Could not find a version of the Boost::System library!)
-            fi
-			if test "x$link_system" = "xno"; then
-				AC_MSG_ERROR(Could not link against $ax_lib !)
-			fi
-		fi
-
-		CPPFLAGS="$CPPFLAGS_SAVED"
-	LDFLAGS="$LDFLAGS_SAVED"
-	fi
-])