Thanks so much for the advice, I really appreciate it! So when I tried that, it did work, and I was able to run a flowgraph successfully in GNU Radio 3.7, so that's good.
[ 2%] Building CXX object lib/CMakeFiles/gnuradio-sigmf.dir/sink_impl.cc.o
/home/ewhite/src/gr-sigmf/lib/
sink_impl.cc: In static member function ‘static gr::sigmf::sink::sptr gr::sigmf::sink::make(std::__cxx11::string, std::__cxx11::string, gr::sigmf::sigmf_time_mode, bool)’:
/home/ewhite/src/gr-sigmf/lib/
sink_impl.cc:81:40: error: could not convert ‘gnuradio::get_initial_sptr(T*) [with T = gr::sigmf::sink_impl]()’ from ‘std::shared_ptr<gr::sigmf::sink_impl>’ to ‘gr::sigmf::sink::sptr {aka boost::shared_ptr<gr::sigmf::sink>}’
return gnuradio::get_initial_sptr(new sink_impl(type, filename, time_mode, append));
~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/gnuradio/basic_block.h:16:0,
from /usr/include/gnuradio/block.h:15,
from /usr/include/gnuradio/sync_block.h:15,
from /home/ewhite/src/gr-sigmf/include/sigmf/sink.h:24,
from /home/ewhite/src/gr-sigmf/lib/sink_impl.h:33,
from /home/ewhite/src/gr-sigmf/lib/
sink_impl.cc:45:
/home/ewhite/src/gr-sigmf/lib/
sink_impl.cc: In member function ‘void gr::sigmf::sink_impl::on_command_message(pmt::pmt_t)’:
/home/ewhite/src/gr-sigmf/lib/
sink_impl.cc:306:55: error: invalid operands of types ‘const char [22]’ and ‘uint64_t {aka long unsigned int}’ to binary ‘operator<<’
GR_LOG_INFO(d_logger, "setting capture meta(" << index_int << "," << key << ", " << val << ")");
~~~~~~~~~~~~~~~~~~~~~~~~^~~~
lib/CMakeFiles/gnuradio-sigmf.dir/build.make:110: recipe for target 'lib/CMakeFiles/gnuradio-sigmf.dir/sink_impl.cc.o' failed
make[2]: *** [lib/CMakeFiles/gnuradio-sigmf.dir/sink_impl.cc.o] Error 1
CMakeFiles/Makefile2:174: recipe for target 'lib/CMakeFiles/gnuradio-sigmf.dir/all' failed
make[1]: *** [lib/CMakeFiles/gnuradio-sigmf.dir/all] Error 2
Makefile:140: recipe for target 'all' failed
make: *** [all] Error 2
Do you have any idea what might be going on here, or what I should do next? Thanks Marcus! Have a good morning.