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cquinn@Quinnertube(master|✚1…) ~/src/moreutils % make                                 4 13838 14:16:30 Sun 07-12-2015
cc -O2 -g -Wall    ifdata.c   -o ifdata
ifdata.c:133:5: warning: implicit declaration of function 'error' is invalid in C99 [-Wimplicit-function-declaration]
                                error(EXIT_FAILURE, 0,
                                ^
1 warning generated.
Undefined symbols for architecture x86_64:
  "_error", referenced from:
      _do_socket_ioctl in ifdata-0e01ad.o
      _please_do in ifdata-0e01ad.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [ifdata] Error 1