./build/program.a(Sntp.o):(.text._ZN4Sntp3runEv+0x10): undefined reference to `sntp_set_update_delay(unsigned int)'
./build/program.a(Sntp.o):(.text._ZN4Sntp3runEv+0x14): undefined reference to `sntp_initialize(timezone const*)'
./build/program.a(Sntp.o):(.text._ZN4Sntp3runEv+0x18): undefined reference to `sntp_set_servers(char**, int)'
./build/program.a(Sntp.o): In function `Sntp::run()':
I'm trying to use the extras/sntp in the Makefile like this =>
However I get an error on linking =>
How do I link in correctly the build/sntp.a ?