build fail

[coreybruce]

Hey just wanted to report a build issue, I got to 97% and than ran into this build error

[ 97%] Building C object CMakeFiles/dumbout.dir/examples/dumbout.c.o
/home/corey/dumb/examples/dumbout.c:1:10: fatal error: argtable2.h: No such file or directory
    1 | #include <argtable2.h>
      |          ^~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/dumbout.dir/build.make:76: CMakeFiles/dumbout.dir/examples/dumbout.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:141: CMakeFiles/dumbout.dir/all] Error 2
make: *** [Makefile:136: all] Error 2