find_header: checking for yaml.h... -------------------- yes

"clang -o conftest -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-darwin19 -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/ruby/backward -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0 -I. -I/Users/nico/.rbenv/versions/2.7.5/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -g -O2 -fno-common -pipe conftest.c  -L. -L/Users/nico/.rbenv/versions/2.7.5/lib -L. -L/Users/nico/.rbenv/versions/2.7.5/lib  -fstack-protector-strong -L/usr/local/lib     -lruby.2.7   "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return !!argv[argc];
6: }
/* end */

"clang -E -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-darwin19 -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/ruby/backward -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0 -I. -I/Users/nico/.rbenv/versions/2.7.5/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -g -O2 -fno-common -pipe  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <yaml.h>
/* end */

--------------------

find_library: checking for yaml_get_version() in -lyaml... -------------------- yes

"clang -o conftest -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-darwin19 -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/ruby/backward -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0 -I. -I/Users/nico/.rbenv/versions/2.7.5/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -g -O2 -fno-common -pipe conftest.c  -L. -L/Users/nico/.rbenv/versions/2.7.5/lib -L. -L/Users/nico/.rbenv/versions/2.7.5/lib  -fstack-protector-strong -L/usr/local/lib     -lruby.2.7 -lyaml   "
conftest.c:14:57: error: use of undeclared identifier 'yaml_get_version'
int t(void) { void ((*volatile p)()); p = (void ((*)()))yaml_get_version; return !p; }
                                                        ^
1 error generated.
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     int (* volatile tp)(void)=(int (*)(void))&t;
 9:     printf("%d", (*tp)());
10:   }
11: 
12:   return !!argv[argc];
13: }
14: int t(void) { void ((*volatile p)()); p = (void ((*)()))yaml_get_version; return !p; }
/* end */

"clang -o conftest -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/x86_64-darwin19 -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0/ruby/backward -I/Users/nico/.rbenv/versions/2.7.5/include/ruby-2.7.0 -I. -I/Users/nico/.rbenv/versions/2.7.5/include  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -g -O2 -fno-common -pipe conftest.c  -L. -L/Users/nico/.rbenv/versions/2.7.5/lib -L. -L/Users/nico/.rbenv/versions/2.7.5/lib  -fstack-protector-strong -L/usr/local/lib     -lruby.2.7 -lyaml   "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: extern int t(void);
 5: int main(int argc, char **argv)
 6: {
 7:   if (argc > 1000000) {
 8:     int (* volatile tp)(void)=(int (*)(void))&t;
 9:     printf("%d", (*tp)());
10:   }
11: 
12:   return !!argv[argc];
13: }
14: extern void yaml_get_version();
15: int t(void) { yaml_get_version(); return 0; }
/* end */

--------------------