所以我目前正在一个涉及打印服务器的Linux环境中使用RoR进行项目。我们正在使用CUPS（请参阅http://cups.org）。我试图捆绑我使用的所有各种宝石，但这是唯一不起作用的宝石。
我从下面的安装中输入命令提示输出和mkmf.log，删除绝对文件扩展名并用＆＃34; ***＆＃34;替换中间位。我使用rbenv，因此文件路径应该是显而易见的。
命令提示
Building native extensions. This could take a while...
ERROR: Error installing cups:
ERROR: Failed to build gem native extension.
checking for main() in -lcups... no
*** 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=/home/***/2.0.0-p481/bin/ruby
--with-cupslib
--without-cupslib
Couldn't find CUPS libraries on your system. Check they're installed and in your path.
mkmf.log
have_library: checking for main() in -lcups... -------------------- no
"gcc -o conftest -I/home/***/ruby-2.0.0/x86_64-linux -I/home/***/ruby-2.0.0/ruby/backward -I/home/***/ruby-2.0.0 -I. -I/home/***/2.0.0-p481/include -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -L/home/***/2.0.0-p481/lib -Wl,-R/home/***/2.0.0-p481/lib -L. -L/home/***/2.0.0-p481/lib -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-R -Wl,/home/***/2.0.0-p481/lib -L/home/***/2.0.0-p481/lib -lruby-static -lpthread -lrt -ldl -lcrypt -lm -lc"
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */
"gcc -o conftest -I/home/***/ruby-2.0.0/x86_64-linux -I/home/***/ruby-2.0.0/ruby/backward -I/home/***/ruby-2.0.0 -I. -I/home/***/2.0.0-p481/include -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -L/home/***/2.0.0-p481/lib -Wl,-R/home/***/2.0.0-p481/lib -L. -L/home/***/2.0.0-p481/lib -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-R -Wl,/home/***/2.0.0-p481/lib -L/home/***/2.0.0-p481/lib -lruby-static -lcups -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:5:57: error: ‘main’ undeclared (first use in this function)
int t(void) { void ((*volatile p)()); p strong text= (void ((*)()))main; return 0; }
^
conftest.c:5:57: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:5:32: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
int t(void) { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
^
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 */
"gcc -o conftest -I/home/***/ruby-2.0.0/x86_64-linux -I/home/***/ruby-2.0.0/ruby/backward -I/home/***/ruby-2.0.0 -I. -I/home/***/2.0.0-p481/include -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration conftest.c -L. -L/home/***/2.0.0-p481/lib -Wl,-R/home/***/2.0.0-p481/lib -L. -L/home/***/2.0.0-p481/lib -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,-R -Wl,/home/***/2.0.0-p481/lib -L/home/***/2.0.0-p481/lib -lruby-static -lcups -lpthread -lrt -ldl -lcrypt -lm -lc"
conftest.c: In function ‘t’:
conftest.c:5:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
int t(void) { main(); return 0; }
^
/usr/bin/ld: cannot find -lcups
collect2: error: ld returned 1 exit status
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 */
--------------------
提前感谢您提供任何帮助
大多数其他答案似乎要么涵盖rvm，要么是无关紧要的问题，更多地关注 bundle 和 gem 之间的区别
答案 0 :(得分：2)
你回答的是第一个日志：Couldn't find CUPS libraries on your system. Check they're installed and in your path。
如果您看到gem源here，则在gem构建器检查依赖项时会显示该消息。
根据gem's documentation您需要安装这些软件包：
sudo apt-get install libcupsys2-dev
或等效物，具体取决于您的系统。
OBS：正如@errata指出的那样，检查一下你是否正确安装了gcc工具。
答案 1 :(得分：0)
您需要安装杯子库
sudo apt-get install libcupsys2-dev