message: [depends] boost: patch unused variable in boost_process
diff: @@ -31,7 +31,9 @@ $(package)_cxxflags_linux=-fPIC
  $(package)_cxxflags_android=-fPIC
  endef
  +# Fix unused variable in boost_process, can be removed after upgrading to 1.72
  define $(package)_preprocess_cmds
  + sed -i.old "s/int ret_sig = 0;//" boost/process/detail/posix/wait_group.hpp && \
  echo "using $($(package)_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags) $($(package)_cppflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$($(package)_archiver_$(host_os))\" <striper>\"$(host_STRIP)\" <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
  endef
  