blocks|key|2010407|text|您的包含路径表明您应该针对系统的OpenSSL安装进行编译。你不应该在你的包目录中有.h文件--它应该从/usr/include/openssl中提取它们。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2010408|普通的OpenSSL包(libssl)不包含.h文件-您还需要安装开发包。它在Debian、Ubuntu和类似的发行版上被命名为libssl-dev，在CentOS、Fedora、Red和类似的发行版上被命名为libssl-devel。|2010409|entityMap^0|16|2|1G|K|0|C|6|M|2|1S|A|2X|C|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|I|$]]

Your include paths indicate that you should be compiling against the system's OpenSSL installation. You shouldn't have the <code>.h</code> files in your package directory - it should be picking them up from <code>/usr/include/openssl</code>.

The plain OpenSSL package (<code>libssl</code>) doesn't include the <code>.h</code> files - you need to install the development package as well. This is named <code>libssl-dev</code> on Debian, Ubuntu and similar distributions, and <code>libssl-devel</code> on CentOS, Fedora, Red Hat and similar.

blocks|key|2010011|text|正确地使用-I旗帜给gcc。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2010012|gcc+-I/path/to/openssl/+-o+Opentest+-lcrypto+Opentest.c|2010013|-I应指向包含openssl文件夹的目录。|2010014|entityMap^0|5|2|0|0|1J|0|0|2|7|7|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|K|$]]

Use the <code>-I</code> flag to gcc properly.

<code>gcc -I/path/to/openssl/ -o Opentest -lcrypto Opentest.c</code>

The <code>-I</code> should point to the directory containing the <code>openssl</code> folder.

blocks|key|1796833|text|使用下面的代码片段作为所引用挑战的解决方案；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1796834|yum+install+openssl
yum+install+openssl-devel|code-block|syntax|javascript|1796835|在具有keepalived版本1.2.7的CentOS版本5.4上测试并证明有效。|1796836|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|$]]

Use the snippet below as a solution for the cited challenge;

<pre><code>yum install openssl
yum install openssl-devel
</code></pre>

Tested and proved effective on CentOS version 5.4 with keepalived version 1.2.7.

blocks|key|2010745|text|您需要包括库路径(-L/usr/local/lib/)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2010746|gcc+-o+Opentest+Opentest.c+-L/usr/local/lib/+-lssl+-lcrypto|offset|length|style|CODE|2010747|这对我很管用。|2010748|entityMap^0|0|0|1N|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|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|$]]

You need to include the library path (-L/usr/local/lib/)

<code>gcc -o Opentest Opentest.c -L/usr/local/lib/ -lssl -lcrypto</code>

It works for me.

blocks|key|1796497|text|如果OpenSSL标头位于当前目录的openssl子目录中，请使用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1796498|gcc+-I.+-o+Opentest+Opentest.c+-lcrypto|code-block|syntax|javascript|1796499|预处理器希望从-I选项中的".“和尖括号中指定的名称创建一个名称，如"./openssl/ssl.h”。如果您指定了双引号(#include+"openssl/ssl.h")中的名称，那么您可能永远不需要问这个问题；Unix上的编译器通常会自动在当前目录中搜索包含在双引号中的头，但对于尖括号中的头(#include+<openssl/ssl.h>)，它不会这样做。它是实现定义的行为。|1796500|您不需要说明OpenSSL库在哪里--您可能需要添加适当的选项和参数来指定，例如'-L+/opt/openssl/lib‘。|1796501|entityMap^0|I|7|0|0|7|2|E|1|Z|F|1Q|O|46|O|0|15|J|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|P|$]]

If the OpenSSL headers are in the <code>openssl</code> sub-directory of the current directory, use:

<pre><code>gcc -I. -o Opentest Opentest.c -lcrypto
</code></pre>

The pre-processor looks to create a name such as "<code>./openssl/ssl.h</code>" from the "<code>.</code>" in the <code>-I</code> option and the name specified in angle brackets. If you had specified the names in double quotes (<code>#include "openssl/ssl.h"</code>), you might never have needed to ask the question; the compiler on Unix usually searches for headers enclosed in double quotes in the current directory automatically, but it does not do so for headers enclosed in angle brackets (<code>#include &lt;openssl/ssl.h&gt;</code>). It is implementation defined behaviour.

You don't say where the OpenSSL libraries are - you might need to add an appropriate option and argument to specify that, such as '<code>-L /opt/openssl/lib</code>'.

blocks|key|1796606|text|从openssl.pc文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1796607|prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name:+OpenSSL
Description:+Secure+Sockets+Layer+and+cryptography+libraries+and+tools
Version:+0.9.8g
Requires:
Libs:+-L${libdir}+-lssl+-lcrypto
Libs.private:+-ldl+-Wl,-Bsymbolic-functions+-lz
Cflags:+-I${includedir}|code-block|syntax|javascript|1796608|您可以注意到其中的Include目录路径和Libs路径。现在，包含文件的前缀是/home/username/Programming。因此，您的包含文件选项应该是-I//home/username/Programming。|offset|length|style|CODE|1796609|(是的，我是从上面的评论中得到的)|1796610|这只是为了删除有关头文件的日志。您也可以提供与-lcrypto库链接的-L<Lib+path>选项。|1796611|entityMap^0|0|0|13|Q|28|T|0|0|N|8|Z|C|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@$I|11|J|12|K|L]|$I|13|J|14|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|R|$]]

From the openssl.pc file

<pre><code>prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: OpenSSL
Description: Secure Sockets Layer and cryptography libraries and tools
Version: 0.9.8g
Requires:
Libs: -L${libdir} -lssl -lcrypto
Libs.private: -ldl -Wl,-Bsymbolic-functions -lz
Cflags: -I${includedir}
</code></pre>

You can note the Include directory path and the Libs path from this. Now your prefix for the include files is <code>/home/username/Programming</code> . 
Hence your include file option should be <code>-I//home/username/Programming</code>. 

(Yes i got it from the comments above)

This is just to remove logs regarding the headers. You may as well provide <code>-L&lt;Lib path&gt;</code> option for linking with the <code>-lcrypto</code> library.

blocks|key|1797093|text|对于这个gcc错误，您应该参考gcc+document+about+Search+Path。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1797094|简而言之：|1797095|1)如果使用尖括号(<>)配合#include，则gcc会首先从系统路径中查找头文件，如/usr/local/include、/usr/include等。|1797096|2)将在搜索默认目录之前搜索-Ldir命令行选项指定的路径。|1797097|3)如果使用引号“”，并将#include作为#include+"+file+"，则优先搜索当前文件所在的目录。|1797098|因此，你的问题的答案如下：|1797099|1)如果您想使用源代码文件夹中的头文件，请在#include指令中将<>替换为"“。|1797100|2)如果您想使用-I命令行选项，请将其添加到您的编译命令行中。(如果在环境变量中设置CFLAGS，则不会自动引用它)|1797101|3)关于包配置(openssl.pc)，如果没有在构建配置中明确声明，我不认为它会被引用。|1797102|entityMap|0|LINK|mutability|MUTABLE|url|https://gcc.gnu.org/onlinedocs/cpp/Search-Path.html^0|F|U|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|18|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|19|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1A|8|@]|9|@]|C|$]]|$1|P|3|Q|5|6|7|1B|8|@]|9|@]|C|$]]|$1|R|3|S|5|6|7|1C|8|@]|9|@]|C|$]]|$1|T|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]]]

For this gcc error, you should reference to to the <a href="https://gcc.gnu.org/onlinedocs/cpp/Search-Path.html" rel="nofollow noreferrer">gcc document about Search Path</a>.

In short:

1) If you use angle brackets(&lt;>) with #include, gcc will search header file firstly from system path such as /usr/local/include and /usr/include, etc.

2) The path specified by -Ldir command-line option, will be searched before the default directories.

3)If you use quotation("") with #include as #include "file", the directory containing the current file will be searched firstly.

so, the answer to your question is as following:

1) If you want to use header files in your source code folder, replace &lt;> with "" in #include directive.

2) if you want to use -I command line option, add it to your compile command line.(if set CFLAGS in environment variables, It will not referenced automatically)

3) About package configuration(openssl.pc), I do not think it will be referenced without explicitly declared in build configuration.

I am trying to compile a small .c file that has the following includes:
<pre><code>#include &lt;openssl/ssl.h&gt;
#include &lt;openssl/rsa.h&gt;
#include &lt;openssl/x509.h&gt;
#include &lt;openssl/evp.h&gt;
</code></pre>
In the same folder where I have the .c file I have a /openssl with all those files (and more), also in synaptic package manager I see OpenSSL installed, I am trying to compile with this:
<pre><code>gcc -o Opentest Opentest.c -lcrypto
</code></pre>
but I always get the errors:
<pre><code>error: openssl/ssl.h: No such file or directory
error: openssl/rsa.h: No such file or directory
error: openssl/x509.h: No such file or directory
error: openssl/evp.h: No such file or directory
</code></pre>
The file I want to compile is only a .c file, doesn't have Makefile or ./configure.
I already tried:
<pre><code>env CFLAGS=-I/path/to/openssl/
</code></pre>
and tried to compile again but I get the same errors.
What should I do in order to compile with OpenSSL includes?

How to compile .c file with OpenSSL includes?

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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我正在尝试编译一个小的.c文件，它包含以下内容：#include <openssl/ssl.h>#include <openssl/rsa.h>#include <openssl/x509.h>#include <openssl/evp.h>在我有.c文件的同一文件夹中，我有一个包含所有这些文件(以及更多文件)的/openssl，同样在synaptic包管理器中，我看到安装了OpenSSL，我正在

问如何用OpenSSL includes编译.c文件？
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