ffi gemをインストールしたい。

下記のエラーで困っています。
xcodeはインストールしていますが、解決しません。

Ruby
1Building native extensions. This could take a while...
2ERROR:  Error installing ffi:
3        ERROR: Failed to build gem native extension.
4
5    current directory: /Users/keitatsukaguchi/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/ffi-1.9.18/ext/ffi_c
6/Users/keitatsukaguchi/.rbenv/versions/2.7.2/bin/ruby -I /Users/keitatsukaguchi/.rbenv/versions/2.7.2/lib/ruby/2.7.0 -r ./siteconf20201213-9752-f24x5l.rb extconf.rb
7checking for ffi_call() in -lffi... yes
8checking for ffi_prep_closure()... yes
9checking for ffi_raw_call()... yes
10checking for ffi_prep_raw_closure()... yes
11checking for shlwapi.h... no
12checking for rb_thread_blocking_region()... no
13checking for rb_thread_call_with_gvl()... yes
14checking for rb_thread_call_without_gvl()... yes
15checking for ffi_prep_cif_var()... yes
16creating extconf.h
17creating Makefile
18
19current directory: /Users/keitatsukaguchi/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/ffi-1.9.18/ext/ffi_c
20make "DESTDIR=" clean
21
22current directory: /Users/keitatsukaguchi/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/ffi-1.9.18/ext/ffi_c
23make "DESTDIR="
24compiling AbstractMemory.c
25compiling ArrayType.c
26compiling Buffer.c
27compiling Call.c
28Call.c:355:5: error: implicit declaration of function 'rb_thread_call_without_gvl' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
29    rbffi_thread_blocking_region(call_blocking_function, data, (void *) -1, NULL);
30    ^
31./Thread.h:78:39: note: expanded from macro 'rbffi_thread_blocking_region'
32# define rbffi_thread_blocking_region rb_thread_call_without_gvl
33                                      ^
34Call.c:409:20: warning: incompatible pointer types passing 'VALUE (void *)' (aka 'unsigned long (void *)') to parameter of type 'VALUE (*)(VALUE)' (aka 'unsigned long (*)(unsigned long)') [-Wincompatible-pointer-types]
35        rb_rescue2(rbffi_do_blocking_call, (VALUE) bc, rbffi_save_frame_exception, (VALUE) &frame, rb_eException, (VALUE) 0);
36                   ^~~~~~~~~~~~~~~~~~~~~~
37/Users/keitatsukaguchi/.rbenv/versions/2.7.2/include/ruby-2.7.0/ruby/ruby.h:1988:25: note: passing argument to parameter here
38VALUE rb_rescue2(VALUE(*)(VALUE),VALUE,VALUE(*)(VALUE,VALUE),VALUE,...);
39                        ^
40Call.c:409:56: warning: incompatible pointer types passing 'VALUE (void *, VALUE)' (aka 'unsigned long (void *, unsigned long)') to parameter of type 'VALUE (*)(VALUE, VALUE)' (aka 'unsigned long (*)(unsigned long, unsigned long)') [-Wincompatible-pointer-types]
41        rb_rescue2(rbffi_do_blocking_call, (VALUE) bc, rbffi_save_frame_exception, (VALUE) &frame, rb_eException, (VALUE) 0);
42                                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~
43/Users/keitatsukaguchi/.rbenv/versions/2.7.2/include/ruby-2.7.0/ruby/ruby.h:1988:47: note: passing argument to parameter here
44VALUE rb_rescue2(VALUE(*)(VALUE),VALUE,VALUE(*)(VALUE,VALUE),VALUE,...);
45                                              ^
462 warnings and 1 error generated.
47make: *** [Call.o] Error 1
48
49make failed, exit code 2
50
51Gem files will remain installed in /Users/keitatsukaguchi/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/ffi-1.9.18 for inspection.
52Results logged to /Users/keitatsukaguchi/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/extensions/x86_64-darwin-19/2.7.0/ffi-1.9.18/gem_make.out