blocks|key|5398333|text|这样啊，原来是这么回事。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5398334|为了构建示例，必须通过-D提供cmake的默认配置。我所做的错误是我试图从samples目录中执行cmake。|offset|length|style|CODE|5398335|构建示例的正确方法是调用cmake，如下所示(从解压的归档文件的根目录中)：|5398336|cmake+-DBUILD_SAMPLES+.|code-block|syntax|javascript|5398337|这将打开采样。可以继续使用make，make+install+than。构建完成后，可以在bin中找到这些示例。|5398338|另请参阅FAQ|5398339|entityMap|0|LINK|mutability|MUTABLE|url|http://opencv.willowgarage.com/wiki/OpenCV%2520GPU%2520FAQ#Are_there_any_samples.3F^0|0|B|2|11|7|0|0|0|19|3|0|4|3|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@$D|19|E|1A|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@]|9|@$D|1C|E|1D|1|1E]]|A|$]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

I got it.

In order to build the samples one has to change the default configuration for cmake by providing it via <code>-D</code>. What I did wrong was that I tried to execute cmake from within the <code>samples</code> directory.

The proper way to build the samples is invoking cmake like so (from within the root directory of the unpacked archive):

<pre><code>cmake -DBUILD_SAMPLES .
</code></pre>

which will turn samples ON. One can proceed using make, make install than. The samples can be found in <code>bin</code> after building.

See also <a href="http://opencv.willowgarage.com/wiki/OpenCV%20GPU%20FAQ#Are_there_any_samples.3F" rel="noreferrer">FAQ</a>

blocks|key|5398346|text|实际上，对于OpenCV+2.4.4测试版，根CMakeList.txt文件是这样写的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5398347|5398348|+OCV_OPTION(BUILD_EXAMPLES“构建所有示例”|blockquote|5398349|5398350|5398351|-DBUILD_EXAMPLES=ON对我来说工作得很好。|offset|length|style|CODE|5398352|entityMap^0|0|0|0|0|0|0|J|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|R|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@$J|V|K|W|L|M]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|O|$]]

Actually for OpenCV 2.4.4 beta the root CMakeList.txt file says:

<blockquote>
 OCV_OPTION(BUILD_EXAMPLES "Build all examples"
</blockquote>

<code>-DBUILD_EXAMPLES=ON</code> worked just fine for me.

blocks|key|5398354|text|如何编译OpenCV示例代码？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5398355|#+For+OpenCV+3+
cd+/path/to/opencv/samples/cpp/
#Compile
g%2B%2B+-ggdb+`pkg-config+--cflags+--libs+opencv`+facedetect.cpp+-o+facedetect
#run
./facedetect|code-block|syntax|javascript|5398356|这对我很有效。|5398357|googled+from+this+link|offset|length|5398358|entityMap|0|LINK|mutability|MUTABLE|url|http://www.learnopencv.com/how-to-compile-opencv-sample-code/^0|0|0|0|0|M|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

How to compile OpenCV sample code ?

<pre><code># For OpenCV 3 
cd /path/to/opencv/samples/cpp/
#Compile
g++ -ggdb `pkg-config --cflags --libs opencv` facedetect.cpp -o facedetect
#run
./facedetect
</code></pre>

Works for me.

<a href="http://www.learnopencv.com/how-to-compile-opencv-sample-code/" rel="nofollow">googled from this link</a>

blocks|key|3185516|text|minor岛的构建指令对我来说几乎是有效的；只是稍微重新排序了一下，并包括了重音：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3185517|g%2B%2B+facedetect.cpp+-o+facedetect+`pkg-config+--libs+opencv`|code-block|syntax|javascript|3185518|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

mydragonisland's build instructions almost worked for me; with a minor reordering and including accents:

<pre><code>g++ facedetect.cpp -o facedetect `pkg-config --libs opencv`
</code></pre>

blocks|key|3669225|text|宏'ocv_check_dependencies‘在以下位置定义:+your_path_to/opencv/cmake/OpenCVModule.cmake|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3669226|#+ensures+that+all+passed+modules+are+available
#+sets+OCV_DEPENDENCIES_FOUND+variable+to+TRUE/FALSE
macro(ocv_check_dependencies)
++set(OCV_DEPENDENCIES_FOUND+TRUE)
++foreach(d+${ARGN})
++++if(d+MATCHES+"%5Eopencv_[%5E+]%2B$"+AND+NOT+HAVE_${d})
++++++set(OCV_DEPENDENCIES_FOUND+FALSE)
++++++break()
++++endif()
++endforeach()
endmacro()|code-block|syntax|javascript|3669227|顶层CMakeLists.txt包含用于opencv/cmake/文件的'include‘命令。这就是为什么在通过从opencv源代码的根目录调用cmake进行编译时，宏是可用的。|3669228|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The macro 'ocv_check_dependencies' is defined in: your_path_to/opencv/cmake/OpenCVModule.cmake 

<pre><code># ensures that all passed modules are available
# sets OCV_DEPENDENCIES_FOUND variable to TRUE/FALSE
macro(ocv_check_dependencies)
 set(OCV_DEPENDENCIES_FOUND TRUE)
 foreach(d ${ARGN})
 if(d MATCHES "^opencv_[^ ]+$" AND NOT HAVE_${d})
 set(OCV_DEPENDENCIES_FOUND FALSE)
 break()
 endif()
 endforeach()
endmacro()
</code></pre>

The top level CMakeLists.txt contains 'include' commands for files from opencv/cmake/ . Which is why the macro is available when you compile by calling cmake from the root of the opencv sources.

blocks|key|5398626|text|原因|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5398627|错误消息上下文：|5398628|CMake+Error+at+CMakeLists.txt:10+(ocv_check_dependencies):
++Unknown+CMake+command+"ocv_check_dependencies".|code-block|syntax|javascript|5398629|出现此错误消息是因为cmake找不到ocv_check_dependencies的定义|offset|length|style|CODE|5398630|这就是为什么控制台说未知CMake命令的原因|BOLD|5398631|解决方案|5398632|如果cmake找不到定义ocv_check_dependencies的位置|5398633|就像@Nick+Hockings说的那样：|5398634|ocv_check_dependencies是在Your/OpenCV/path/OpenCVModule.cmake中定义的宏|5398635|macro(ocv_check_dependencies)
++set(OCV_DEPENDENCIES_FOUND+TRUE)
++foreach(d+${ARGN})
++++if(d+MATCHES+"%5Eopencv_[%5E+]%2B$"+AND+NOT+HAVE_${d})
++++++set(OCV_DEPENDENCIES_FOUND+FALSE)
++++++break()
++++endif()
++endforeach()
endmacro()|5398636|5398637|5398638|这应该可以解决这个问题，我希望以后没有人再为这个问题费心了。|5398639|entityMap^0|0|0|0|I|M|0|A|9|0|0|C|M|0|0|0|M|O|Z|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|18|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1A|8|@$K|1B|L|1C|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1D|8|@$K|1E|L|1F|M|Q]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1G|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1H|8|@$K|1I|L|1J|M|N]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1K|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1L|8|@$K|1M|L|1N|M|N]|$K|1O|L|1P|M|N]]|9|@]|A|$]]|$1|Z|3|10|5|F|7|1Q|8|@]|9|@]|A|$G|H]]|$1|11|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|1T|8|@]|9|@]|A|$]]|$1|15|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|16|$]]

<h2>Reason</h2>

error message context:

<pre><code>CMake Error at CMakeLists.txt:10 (ocv_check_dependencies):
 Unknown CMake command "ocv_check_dependencies".
</code></pre>

This error message happens because cmake can't find the definition of <code>ocv_check_dependencies</code>

That's why the console said Unknown CMake command

<h2>Solution</h2>

If cmake cannot find where <code>ocv_check_dependencies</code> is defined

Just like @Nick Hockings Said:

<code>ocv_check_dependencies</code> is a macro defined in <code>Your/OpenCV/path/OpenCVModule.cmake</code> 

<pre><code>macro(ocv_check_dependencies)
 set(OCV_DEPENDENCIES_FOUND TRUE)
 foreach(d ${ARGN})
 if(d MATCHES "^opencv_[^ ]+$" AND NOT HAVE_${d})
 set(OCV_DEPENDENCIES_FOUND FALSE)
 break()
 endif()
 endforeach()
endmacro()
</code></pre>

The fastest way is to copy this snippet above to your <code>CMakeList.txt</code> file right above where <code>ocv_check_dependencies</code> is

Therefore, cmake can finally understand what it is

That should do the trick, i hope no one else will bother with this question in the future

blocks|key|5307861|text|我得到了类似的错误。我的方法如下:+1)+cd+xxx/samples+2)+mkdir+build+3)+cd+build+4)+cmake+..5)现在就让它工作。我们不能在它们的源文件下构建单独的项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5307862|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I got similar errors. My approach is as following:
1) cd xxx/samples 2) mkdir build 3) cd build 4) cmake .. 5) make
Now it works. We could not build individual project under their source files.

blocks|key|5308096|text|下面的步骤对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5308097|导出刀具链路径。|5308098|cd+opencv-3.3.0/samples|5308099|cross_cmake+&&+cross_make|5308100|cd+opencv-3.3.0/samples/cpp/|5308101|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Following steps works for me.

Export toolchain path.

cd opencv-3.3.0/samples

cross_cmake &amp;&amp; 
cross_make

cd opencv-3.3.0/samples/cpp/

I am trying to build the OpenCV samples which come with the source package and I get the following:

<pre><code>CMake Error at CMakeLists.txt:10 (ocv_check_dependencies):
 Unknown CMake command "ocv_check_dependencies".
</code></pre>

I did install OpenCV using

<pre><code>cmake .
make
sudo make install
</code></pre>

and I got a tutorial snippet working (thus I suppose it is installed correctly as a library). However, compiling the samples does not work.

I guess I have to somehow configure CMake to have “ocv_check_dependencies” - but how? I am lost!

Compiling opencv samples: unknown cmake command ocv_check_dependencies

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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社区新版编辑器体验调研

我正在尝试构建源码包附带的OpenCV示例，我得到了以下内容：CMake Error at CMakeLists.txt:10 (ocv_check_dependencies):  Unknown CMake command "ocv_check_dependencies".我确实使用以下命令安装了OpenCVcmake .makesudo make install我得到了一个可以正常工作的教程片

问编译opencv示例:未知的cmake命令ocv_check_dependencies
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