curl/curl.h file not found in FreeBSD

When I use clang to compile test.c, the following error occurs.

fatal error: 'curl/curl.h' file not found

The compile command is:

$ clang test.c -o test

I did some research. Then I know I need to change the compile command as follows:

$ clang -I/usr/local/include -L/usr/local/lib -lcurl test.c -o test