iconv_open Error on Mac OS

I've tried 'meson build' on Mac OS and encountered an error below.

||Header <pthread.h> has symbol "pthread_getname_np" : YES
||Checking if "pthread_setname_np(const char*)" with dependency threads links: YES
||Checking if "stack grows check" runs: NO (1)
||Checking for function "iconv_open" : NO
|Couldn't use fallback subproject in subprojects/glib for the dependency glib-2.0 
|Reason: subprojects/glib/meson.build:1726: Problem encountered: iconv implementation "libc" not found

subprojects/gstreamer/meson.build:430:0: ERROR:  Dependency "glib-2.0" not found, tried pkgconfig and framework

What's the problem? I think symbols of libiconv provided originally on Mac OS is somehow different things expected.. Anyone who can solve this error??