Missing gnutls.h

[scottpedia]

My build script failed and returned the following error message:

/Users/black/Documents/code/pluto-sdr/package-installation/gnuradio-for-mac-without-macports/tmp/libzmq/src/ctx.cpp:60:10: fatal error: 'gnutls/gnutls.h' file not found
#include <gnutls/gnutls.h>
         ^~~~~~~~~~~~~~~~~
1 warning generated.
1 error generated.
1 warning generated.
make[2]: *** [CMakeFiles/objects.dir/src/ctx.cpp.o] Error 1
1 warning generated.
1 warning generated.
1 warning generated.
make[1]: *** [CMakeFiles/objects.dir/all] Error 2
make: *** [all] Error 2
E: failed to build libzmq

After I installed gnutls with homebrew, the same message still comes back. Please help me solve the problem, thanks!