使用 FFTW 取消定义架构 x86_64 的符号

Ceeloss-MacBook-Pro:desktop ceelos$ gcc -o prog -I/usr/local/include test.c
Undefined symbols for architecture x86_64:
  "_fftw_destroy_plan", referenced from:
      _main in test-IBqBdS.o
  "_fftw_execute", referenced from:
      _main in test-IBqBdS.o
  "_fftw_plan_dft_1d", referenced from:
      _main in test-IBqBdS.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Ceeloss-MacBook-Pro:desktop ceelos$ 

这告诉我什么？

它告诉您您忘记使用-L and -l告诉 gcc FFTW 库在哪里以及它们的名称。