我发现了一些问题，但是没有一个问题可以解决。
Trying to install ruby-filemagic on Snow Leopard using brew rather than ports
Having difficulty installing ruby-filemagic gem on new RHEL6 server
他们都指向此页面作为答案
https://gist.github.com/eparreno/1845561
除此之外也不起作用。我仍然收到以下错误。
Building native extensions with: '--with-magic-include=/usr/local/include --with-magic-lib=/usr/local/lib/'
This could take a while...
ERROR: Error installing ruby-filemagic:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb --with-magic-include=/usr/local/include --with-magic-lib=/usr/local/lib/
checking for main() in -lgnurx... no
checking for magic_open() in -lmagic... no
*** ERROR: missing required library to compile this module
*** 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
--without-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=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
--with-magic-dir
--without-magic-dir
--with-magic-include=${magic-dir}/include
--with-magic-lib=${magic-dir}/
--with-gnurx-dir
--without-gnurx-dir
--with-gnurx-include
--without-gnurx-include=${gnurx-dir}/include
--with-gnurx-lib
--without-gnurx-lib=${gnurx-dir}/
--with-gnurxlib
--without-gnurxlib
--with-magiclib
--without-magiclib
Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/ruby-filemagic-0.7.0 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/gems/ruby-filemagic-0.7.0/ext/filemagic/gem_make.out
那么改变了什么？在提到mkmf.log的错误中，我在日志文件中看到了很多编译内容，所以我不知道错误到底在哪里。它看起来如下：
have_library: checking for main() in -lgnurx... -------------------- no
"xcrun clang -o conftest -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/universal-darwin14 -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/ruby/backward -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0 -I. -I/usr/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -g -Os -pipe -DHAVE_GCC_SYNC_BUILTINS conftest.c -L. -L/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib -L/usr/local/lib/ -L. -L/usr/local/lib -arch x86_64 -arch i386 -lruby.2.0.0 -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 */
"xcrun clang -o conftest -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/universal-darwin14 -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/ruby/backward -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0 -I. -I/usr/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -g -Os -pipe -DHAVE_GCC_SYNC_BUILTINS conftest.c -L. -L/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib -L/usr/local/lib/ -L. -L/usr/local/lib -arch x86_64 -arch i386 -lruby.2.0.0 -lgnurx -lpthread -ldl -lobjc "
conftest.c:5:57: error: use of undeclared identifier 'main'
int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
^
1 error generated.
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: extern int t(void);
5: int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
6: int main(int argc, char **argv)
7: {
8: if (argc > 1000000) {
9: printf("%p", &t);
10: }
11:
12: return 0;
13: }
/* end */
"xcrun clang -o conftest -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/universal-darwin14 -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/ruby/backward -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0 -I. -I/usr/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -g -Os -pipe -DHAVE_GCC_SYNC_BUILTINS conftest.c -L. -L/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib -L/usr/local/lib/ -L. -L/usr/local/lib -arch x86_64 -arch i386 -lruby.2.0.0 -lgnurx -lpthread -ldl -lobjc "
conftest.c:5:15: warning: implicit declaration of function 'main' is invalid in C99 [-Wimplicit-function-declaration]
int t(void) { main(); return 0; }
^
1 warning generated.
ld: library not found for -lgnurx
conftest.c:5:15: warning: implicit declaration of function 'main' is invalid in C99 [-Wimplicit-function-declaration]
int t(void) { main(); return 0; }
^
1 warning generated.
clang: error: linker command failed with exit code 1 (use -v to see invocation)
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: extern int t(void);
5: int t(void) { main(); return 0; }
6: int main(int argc, char **argv)
7: {
8: if (argc > 1000000) {
9: printf("%p", &t);
10: }
11:
12: return 0;
13: }
/* end */
--------------------
have_library: checking for magic_open() in -lmagic... -------------------- no
"xcrun clang -o conftest -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/universal-darwin14 -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/ruby/backward -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0 -I. -I/usr/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -g -Os -pipe -DHAVE_GCC_SYNC_BUILTINS conftest.c -L. -L/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib -L/usr/local/lib/ -L. -L/usr/local/lib -arch x86_64 -arch i386 -lruby.2.0.0 -lmagic -lpthread -ldl -lobjc "
conftest.c:5:57: error: use of undeclared identifier 'magic_open'
int t(void) { void ((*volatile p)()); p = (void ((*)()))magic_open; return 0; }
^
1 error generated.
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: extern int t(void);
5: int t(void) { void ((*volatile p)()); p = (void ((*)()))magic_open; return 0; }
6: int main(int argc, char **argv)
7: {
8: if (argc > 1000000) {
9: printf("%p", &t);
10: }
11:
12: return 0;
13: }
/* end */
"xcrun clang -o conftest -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/universal-darwin14 -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0/ruby/backward -I/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/include/ruby-2.0.0 -I. -I/usr/local/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT -g -Os -pipe -DHAVE_GCC_SYNC_BUILTINS conftest.c -L. -L/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib -L/usr/local/lib/ -L. -L/usr/local/lib -arch x86_64 -arch i386 -lruby.2.0.0 -lmagic -lpthread -ldl -lobjc "
conftest.c:5:15: warning: implicit declaration of function 'magic_open' is invalid in C99 [-Wimplicit-function-declaration]
int t(void) { magic_open(); return 0; }
^
1 warning generated.
conftest.c:5:15: warning: implicit declaration of function 'magic_open' is invalid in C99 [-Wimplicit-function-declaration]
int t(void) { magic_open(); return 0; }
^
1 warning generated.
ld: warning: ignoring file /usr/local/lib//libmagic.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/lib//libmagic.dylib
Undefined symbols for architecture i386:
"_magic_open", referenced from:
_t in conftest-d6cdee.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: /*top*/
4: extern int t(void);
5: int t(void) { magic_open(); return 0; }
6: int main(int argc, char **argv)
7: {
8: if (argc > 1000000) {
9: printf("%p", &t);
10: }
11:
12: return 0;
13: }
/* end */
--------------------
主要问题似乎是这个
conftest.c:5:57: error: use of undeclared identifier 'magic_open'
int t(void) { void ((*volatile p)()); p = (void ((*)()))magic_open; return 0; }
我不懂C ++，所以我不知道magic_open的问题是什么
有什么想法吗？
答案 0 :(得分：0)
几年后...在Mac上尝试。
brew install libmagic
希望这可以帮助其他任何遇到此问题的人。
答案 1 :(得分：-1)
我认为您需要接受xcode许可
例如，键入(x^T)PQx并按照显示的过程