无法安装ruby opencv gem

我无法安装ruby opencv gem

以下是我到目前为止所做的

已使用安装的openCV

sudo apt-get install libopencv-dev

然后尝试使用安装ruby opencv gem

gem install ruby-opencv

但是我犯了以下错误

➜  test  gem install ruby-opencv
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-opencv:
    ERROR: Failed to build gem native extension.

    /home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/bin/ruby extconf.rb
>> Check the required libraries...
checking for main() in -lopencv_calib3d... yes
checking for main() in -lopencv_contrib... yes
checking for main() in -lopencv_core... yes
checking for main() in -lopencv_features2d... yes
checking for main() in -lopencv_flann... yes
checking for main() in -lopencv_gpu... 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/ckgagan/.rvm/rubies/ruby-1.9.3-p484/bin/ruby
    --with-opencv-dir
    --without-opencv-dir
    --with-opencv-include
    --without-opencv-include=${opencv-dir}/include
    --with-opencv-lib
    --without-opencv-lib=${opencv-dir}/lib
    --with-libxml2-dir
    --without-libxml2-dir
    --with-libxml2-include
    --without-libxml2-include=${libxml2-dir}/include
    --with-libxml2-lib
    --without-libxml2-lib=${libxml2-dir}/lib
    --with-opencv_calib3dlib
    --without-opencv_calib3dlib
    --with-opencv_contriblib
    --without-opencv_contriblib
    --with-opencv_corelib
    --without-opencv_corelib
    --with-opencv_features2dlib
    --without-opencv_features2dlib
    --with-opencv_flannlib
    --without-opencv_flannlib
    --with-opencv_gpulib
    --without-opencv_gpulib
extconf.rb:53:in `block in <main>': libopencv_gpu not found. (RuntimeError)
    from extconf.rb:52:in `each'
    from extconf.rb:52:in `<main>'

---

谢谢

请按照其上的说明尝试安装带有opencv安装路径的gem

---

经过数小时的调查，我成功地安装了这个gem-ruby-opencv，但失败了很多

您必须从下载2.x归档文件，注意，您无法安装最新版本3.0.beta，我是最初下载3.0.beta的人，并且多次失败

然后安装所需的软件包，并根据本说明进行安装opencv

根据本安装说明，您不需要构建opencv_contrib，只需构建opencv即可

最后，执行gemi-ruby-opencv

---

祝你好运。

@lan Delairre，这是我在安装opencv时的笔记，希望对你有所帮助：

从下载opencv-2.4.10

构建库

如果出现错误，请尝试按照此说明安装软件包

---

什么显示mkmf.log？为什么不能安装

libopencv\u gpu

dev？很抱歉，mkmf.log驻留在哪里：）。我在/var/log目录中搜索了它，但它不在那里。它将驻留在build文件夹中：但是尝试使用

find~/-name mkmf.log

在更新部分下添加了mkmf.log的内容我找到了这个包：嗨，晓晖，我现在正在完成这个过程。你能说更多关于不需要构建opencv_contrib和普通opencv的内容吗？看起来指向文档的链接已断开，我在同一网站上找到的安装文档中没有提到这种差异。按照您的指导，RVM重新安装ruby版本，然后安装（brew installl opencv）和ruby opencv（捆绑安装），完成！在许多情况下，2.4.11似乎是一个更好的选择，因为gcc的旧版本无法编译2.4.10

➜  test  cat /home/ckgagan/.rvm/gems/ruby-1.9.3-p484/gems/ruby-opencv-0.0.11/ext/opencv/mkmf.log
have_library: checking for main() in -lopencv_calib3d... -------------------- yes

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic     '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby  -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/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic     '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { void ((*volatile p)()); p = (void ((*)()))main; 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 */

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic     '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { main(); 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_library: checking for main() in -lopencv_contrib... -------------------- yes

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { void ((*volatile p)()); p = (void ((*)()))main; 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 */

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { main(); 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_library: checking for main() in -lopencv_core... -------------------- yes

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { void ((*volatile p)()); p = (void ((*)()))main; 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 */

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { main(); 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_library: checking for main() in -lopencv_features2d... -------------------- yes

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_core -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { void ((*volatile p)()); p = (void ((*)()))main; 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 */

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_core -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { main(); 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_library: checking for main() in -lopencv_flann... -------------------- yes

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { void ((*volatile p)()); p = (void ((*)()))main; 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 */

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { main(); 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_library: checking for main() in -lopencv_gpu... -------------------- no

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_gpu -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:53: error: ‘main’ undeclared (first use in this function)
conftest.c:4:53: note: each undeclared identifier is reported only once for each function it appears in
conftest.c:4:28: warning: variable ‘p’ set but not used [-Wunused-but-set-variable]
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { void ((*volatile p)()); p = (void ((*)()))main; 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 */

"gcc -o conftest -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/x86_64-linux -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1/ruby/backward -I/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/include/ruby-1.9.1 -I. -I/usr/include -I/usr/local/include     -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC conftest.c  -L. -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -Wl,-R/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/usr/lib -Wl,-R/usr/lib -L/usr/local/lib -Wl,-R/usr/local/lib -L.  -rdynamic -Wl,-export-dynamic    -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  '-Wl,-rpath,/../lib' -Wl,-R -Wl,/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -L/home/ckgagan/.rvm/rubies/ruby-1.9.3-p484/lib -lruby -lopencv_gpu -lopencv_flann -lopencv_features2d -lopencv_core -lopencv_contrib -lopencv_calib3d  -lpthread -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:4:1: warning: implicit declaration of function ‘main’ [-Wimplicit-function-declaration]
/usr/bin/ld: cannot find -lopencv_gpu
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: /*top*/
 4: int t() { main(); 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 */

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

gem install ruby-opencv -- --with-opencv-dir=/path/to/opencvdir

sudo apt-get install build-essential
sudo apt-get install cmake
sudo apt-get install libgtk2.0-dev
sudo apt-get install python-dev python-numpy
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev

cd ~/src/opencv-2.4.10
mkdir release
cd release
cmake -DWITH_QT=ON -DWITH_OPENGL=ON -DFORCE_VTK=ON -DWITH_TBB=ON -DWITH_GDAL=ON -DWITH_XINE=ON -DBUILD_EXAMPLES=ON ..
make -j7
sudo make install
sudo ldconfig