"젬 네이티브 확장을 빌드하지 못했습니다." mysql2 (OSX)를 설치할 때

Question

mysql2를 설치하려고 할 때 mysql.h 오류가 발생합니다. 하지만 mysql (mysql-devel 필요)을 설치하려고하면 "mysql이 이미 설치되어있다"라는 경고가 표시된다. 그러면 오류 메시지가 나타나는 이유는 무엇입니까? 답장을위한 THX! (RoR에 2.0.0)의 MySQL

sudo gem install mysql2 -v '0.3.11' 
Building native extensions. This could take a while... 
ERROR: Error installing mysql2: 
    ERROR: Failed to build gem native extension. 

/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb 
checking for rb_thread_blocking_region()... yes 
checking for rb_wait_for_single_fd()... yes 
checking for mysql.h... no 
checking for mysql/mysql.h... no 
----- 
mysql.h is missing. please check your installation of mysql and try again. 
----- 
*** extconf.rb failed *** 
Could not create Makefile due to some reason, probably lack of 
necessary libraries and/or headers. Check the mkmf.log file for more 
details. You may need configuration options. 

Provided configuration options: 
--with-opt-dir 
--with-opt-include 
--without-opt-include=${opt-dir}/include 
--with-opt-lib 
--without-opt-lib=${opt-dir}/lib 
--with-make-prog 
--without-make-prog 
--srcdir=. 
--curdir 
--ruby=/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/bin/ruby 
--with-mysql-config 
--without-mysql-config 


Gem files will remain installed in /Users/michaljurnik/.rvm/gems/ruby-1.9.3- p448/gems/mysql2-0.3.11 for inspection. 
Results logged to /Users/michaljurnik/.rvm/gems/ruby-1.9.3-p448/gems/mysql2-0.3.11/ext/mysql2/gem_make.out 

및 설치

brew install mysql 
Warning: mysql-5.6.12 already installed 

mkmf.log :

have_func: checking for rb_thread_blocking_region()... -------------------- yes 

"/usr/local/bin/gcc-4.2 -o conftest -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/ruby/backward -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -L. -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib  -lruby.1.9.1 -lpthread -ldl -lobjc " 
checked program was: 
/* begin */ 
1: #include "ruby.h" 
2: 
3: int main(int argc, char **argv) 
4: { 
5: return 0; 
6: } 
/* end */ 

"/usr/local/bin/gcc-4.2 -o conftest -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/ruby/backward -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -L. -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib  -lruby.1.9.1 -lpthread -ldl -lobjc " 
checked program was: 
/* begin */ 
1: #include "ruby.h" 
2: 
3: /*top*/ 
4: int t() { void ((*volatile p)()); p = (void ((*)()))rb_thread_blocking_region; return 0; } 
5: int main(int argc, char **argv) 
6: { 
7: if (argc > 1000000) { 
8:  printf("%p", &t); 
9: } 
10: 
11: return 0; 
12: } 
/* end */ 

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

have_func: checking for rb_wait_for_single_fd()... -------------------- yes 

"/usr/local/bin/gcc-4.2 -o conftest -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/ruby/backward -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -L. -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib  -lruby.1.9.1 -lpthread -ldl -lobjc " 
conftest.c: In function ‘t’: 
conftest.c:4: error: ‘rb_wait_for_single_fd’ undeclared (first use in this function) 
conftest.c:4: error: (Each undeclared identifier is reported only once 
conftest.c:4: error: for each function it appears in.) 
checked program was: 
/* begin */ 
1: #include "ruby.h" 
2: 
3: /*top*/ 
4: int t() { void ((*volatile p)()); p = (void ((*)()))rb_wait_for_single_fd; return 0; } 
5: int main(int argc, char **argv) 
6: { 
7: if (argc > 1000000) { 
8:  printf("%p", &t); 
9: } 
10: 
11: return 0; 
12: } 
/* end */ 

"/usr/local/bin/gcc-4.2 -o conftest -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/ruby/backward -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -L. -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib  -lruby.1.9.1 -lpthread -ldl -lobjc " 
conftest.c: In function ‘t’: 
conftest.c:4: warning: implicit declaration of function ‘rb_wait_for_single_fd’ 
checked program was: 
/* begin */ 
1: #include "ruby.h" 
2: 
3: /*top*/ 
4: int t() { rb_wait_for_single_fd(); return 0; } 
5: int main(int argc, char **argv) 
6: { 
7: if (argc > 1000000) { 
8:  printf("%p", &t); 
9: } 
10: 
11: return 0; 
12: } 
/* end */ 

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

have_header: checking for mysql.h... -------------------- no 

"/usr/local/bin/gcc-4.2 -E -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/ruby/backward -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -I/usr/local/Cellar/mysql/5.6.12/include -Wno-null-conversion -Os -g -fno-strict-aliasing -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -o conftest.i" 
cc1: error: unrecognized command line option "-Wno-null-conversion" 
checked program was: 
/* begin */ 
1: #include "ruby.h" 
2: 
3: #include <mysql.h> 
/* end */ 

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

have_header: checking for mysql/mysql.h... -------------------- no 

"/usr/local/bin/gcc-4.2 -E -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1/ruby/backward -I/Users/michaljurnik/.rvm/rubies/ruby-1.9.3-p448/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -I/usr/local/Cellar/mysql/5.6.12/include -Wno-null-conversion -Os -g -fno-strict-aliasing -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -o conftest.i" 
cc1: error: unrecognized command line option "-Wno-null-conversion" 
checked program was: 
/* begin */ 
1: #include "ruby.h" 
2: 
3: #include <mysql/mysql.h> 
/* end */ 

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

Answer 1

시도가 "2"없이 단지 MySQL을 설치하기 :

gem install mysql