This article is post on https://coderwall.com/p/ggmpfa

configure: error: xslt-config not found. Please reinstall the libxslt >= 1.1.0 distribution

yum -y install libxslt-devel

configure: error: Could not find net-snmp-config binary. Please check your net-snmp installation.

yum -y install net-snmp-devel

configure: error: Please reinstall readline - I cannot find readline.h

yum -y install readline-devel

configure: error: Cannot find pspell

yum -y install aspell-devel

checking for unixODBC support... configure: error: ODBC header file '/usr/include/sqlext.h' not found!

yum -y install unixODBC-devel

configure: error: Unable to detect ICU prefix or /usr/bin/icu-config failed. Please verify ICU install prefix and make sure icu-config works.

yum -y install libicu-devel

configure: error: utf8mime2text() has new signature, but U8TCANONICAL is missing. This should not happen. Check config.log for additional information.

yum -y install libc-client-devel

configure: error: freetype.h not found.

yum -y install freetype-devel

configure: error: xpm.h not found.

yum -y install libXpm-devel

configure: error: png.h not found.

yum -y install libpng-devel

configure: error: vpx_codec.h not found.

yum -y install libvpx-devel

configure: error: Cannot find enchant

yum -y install enchant-devel

configure: error: Please reinstall the libcurl distribution - easy.h should be in /include/curl/

yum -y install libcurl-devel

LAOGAO added 20140907：

configure: error: mcrypt.h not found. Please reinstall libmcrypt.

wget ftp://mcrypt.hellug.gr/pub/crypto/mcrypt/libmcrypt/libmcrypt-2.5.7.tar.gz
tar zxf libmcrypt-2.5.7.tar.gz
cd libmcrypt-2.5.7
./configure
make && make install

added 20141003：

Cannot find imap

ln -s /usr/lib64/libc-client.so /usr/lib/libc-client.so

configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing.

yum -y install libc-client-devel

Cannot find ldap.h

yum -y install openldap
yum -y install openldap-devel

configure: error: Cannot find ldap libraries in /usr/lib

cp -frp /usr/lib64/libldap* /usr/lib/

configure: error: Cannot find libpq-fe.h. Please specify correct PostgreSQL installation path

yum -y install postgresql-devel

configure: error: Please reinstall the lib curl distribution

yum -y install curl-devel

configure: error: Could not find net-snmp-config binary. Please check your net-snmp installation.

yum -y install net-snmp-devel

configure: error: xslt-config not found. Please reinstall the libxslt >= 1.1.0 distribution

yum -y install libxslt-devel

checking for BZip2 support… yes checking for BZip2 in default path… not found configure: error: Please reinstall the BZip2 distribution

Fix:

yum -y install bzip2-devel

checking for cURL support… yes checking if we should use cURL for url streams… no checking for cURL in default path… not found configure: error: Please reinstall the libcurl distribution – easy.h should be in/include/curl/

Fix:

yum -y install curl-devel

checking for curl_multi_strerror in -lcurl… yes checking for QDBM support… no checking for GDBM support… no checking for NDBM support… no configure: error: DBA: Could not find necessary header file(s).

Fix:

yum -y install db4-devel

checking for fabsf… yes checking for floorf… yes configure: error: jpeglib.h not found.

Fix:

yum -y install libjpeg-devel

checking for fabsf… yes checking for floorf… yes checking for jpeg_read_header in -ljpeg… yes configure: error: png.h not found.

Fix:

yum -y install libpng-devel

checking for png_write_image in -lpng… yes If configure fails try –with-xpm-dir=

configure: error: freetype.h not found. Fix:

Reconfigure your PHP with the following option. --with-xpm-dir=/usr

checking for png_write_image in -lpng… yes configure: error: libXpm.(a|so) not found.

Fix:

yum -y install libXpm-devel

checking for bind_textdomain_codeset in -lc… yes checking for GNU MP support… yes configure: error: Unable to locate gmp.h

Fix:

yum -y install gmp-devel

checking for utf8_mime2text signature… new checking for U8T_DECOMPOSE… configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.

Fix:

yum -y install libc-client-devel

checking for LDAP support… yes, shared checking for LDAP Cyrus SASL support… yes configure: error: Cannot find ldap.h

Fix:

yum -y install openldap-devel

checking for mysql_set_character_set in -lmysqlclient… yes checking for mysql_stmt_next_result in -lmysqlclient… no checking for Oracle Database OCI8 support… no checking for unixODBC support… configure: error: ODBC header file ‘/usr/include/sqlext.h’ not found!

Fix:

yum -y install unixODBC-devel

checking for PostgreSQL support for PDO… yes, shared checking for pg_config… not found configure: error: Cannot find libpq-fe.h. Please specify correct PostgreSQL installation path

Fix:

yum -y install postgresql-devel

checking for sqlite 3 support for PDO… yes, shared checking for PDO includes… (cached) /usr/local/src/php-5.3.7/ext checking for sqlite3 files in default path… not found configure: error: Please reinstall the sqlite3 distribution

Fix:

yum -y install sqlite-devel

checking for utsname.domainname… yes checking for PSPELL support… yes configure: error: Cannot find pspell

Fix:

yum -y install aspell-devel

checking whether to enable UCD SNMP hack… yes checking for default_store.h… no

checking for kstat_read in -lkstat… no checking for snmp_parse_oid in -lsnmp… no checking for init_snmp in -lsnmp… no configure: error: SNMP sanity check failed. Please check config.log for more information.

Fix:

yum -y install net-snmp-devel

checking whether to enable XMLWriter support… yes, shared checking for xml2-config path… (cached) /usr/bin/xml2-config checking whether libxml build works… (cached) yes checking for XSL support… yes, shared configure: error: xslt-config not found. Please reinstall the libxslt >= 1.1.0 distribution

Fix:

yum -y install libxslt-devel

configure: error: xml2-config not found. Please check your libxml2 installation.

Fix:

yum -y install libxml2-devel

checking for PCRE headers location… configure: error: Could not find pcre.h in /usr

Fix:

yum -y install pcre-devel

configure: error: Cannot find MySQL header files under yes. Note that the MySQL client library is not bundled anymore!

Fix:

yum -y install mysql-devel

checking for unixODBC support… configure: error: ODBC header file ‘/usr/include/sqlext.h’ not found!

Fix:

yum -y install unixODBC-devel

checking for pg_config… not found configure: error: Cannot find libpq-fe.h. Please specify correct PostgreSQL installation path

Fix:

yum -y install postgresql-devel

configure: error: Cannot find pspell

Fix:

yum -y install pspell-devel

configure: error: Could not find net-snmp-config binary. Please check your net-snmp installation.

Fix:

yum -y install net-snmp-devel

configure: error: xslt-config not found. Please reinstall the libxslt >= 1.1.0 distribution

Fix:

yum -y install libxslt-devel

目前有三种方法

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源码安装：

点击这里下载源码

解压前线装一下必要的包

    yum install python-devel mysql-devel zlib-devel openssl-devel

解压

    tar xf MySQL-python-1.2.3.tar.gz
    cd MySQL-python-1.2.3

修改mysite.cfg，指定mysql-config的路径

使用whereis mysql-config找路径

    vi mysite.cfg
    #找到mysql_config = XXX
    改为你的路径

继续安装

    python setup.py build
    python setup.py install

工具安装：

sudo easy_install mysql-python

sudo pip install mysql-python

出现错误的解决办法
---

```bash
vi ~/.bash_profile
# add
export DYLD_LIBRARY_PATH='/usr/local/mysql/lib';
PATH="$PATH:/usr/local/mysql/bin"

enjoy~

Win下请直接下载编译好的安装包：

请输入链接描述

方法一：

$a = $a^$b;
$b = $b^$a;
$a = $a^$b;

这就是位运算带给我们的奇妙之处！（这种方法只适合于int型和string型，而且位数不能超过8位）

方法二：

list($var1, $var2) = array($var2, $var1);

软件版本总结

版本号

V（Version）：即版本，通常用数字表示版本号。(如:EVEREST Ultimate v4.20.1188 Beta ) Build：用数字或日期标示版本号的一种方式。(如:VeryCD eMule v0.48a Build 071112) SP：Service Pack，升级包。(如:Windows XP SP 2/Vista SP 1)

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#安装Scarpy踩过的坑

Scrapy是python下一个著名的爬虫，目前最新版为0.24。

这是他的帮助文档->Scrapy 0.24 文档

其中**选择器篇**需要好好研究！

帮助文档里的安装指南写得很宽泛，所以安装出错是在正常不过的事了。(再者说，安装出错确实不是Scrapy的错嘛)

So here is the doc to help you with installing Scrapy.

First of all, before installing, please make sure U have already installed these libs or apps below:

• python version >= 2.7
• python-devel package
• libs:
  1. xml2-dev
  2. xslt-dev
  3. ffi-dev
  4. openssl-dev

If not, commands below may help:

on Redhat/Centos:

yum install python-devel libxml2-devel libxslt-devel libffi-devel openssl-devel bzip2-devel 

on Debian/Ubuntu:

apt-get install python-dev libxml2-dev libxslt1-dev libffi-dev libssl-dev libbz2-dev

If your python version is less than 2.7, this article -> upgrade python may help U in upgrading python.

I have summarized some errors when installing scrapy and hope they can be used as a reference for you.

CompressionError: bz2 module is not available

This usually happens when you have compiled python and use pip install Scrapy command.

The reason is you don't have bzip2 lib installed:

on Redhat/Centos:

yum install bzip2-devel 

on Debian/Ubuntu:

apt-get install libbz2-dev

After you have installed the bzip2 package,you have to compile python again to make bzip module work.

Finally,use pip install --upgrade scrapy to finish the installation.

Setup script exited with error: command 'gcc' failed with exit status 1

The cause is u didn't install python-dev

on Redhat/Centos:

yum install python-devel

on Debian/Ubuntu:

apt-get install python-dev

Finally,use pip install scrapy or easy_install scrapy to finish the installation.

error: Not a recognized archive type: /tmp/easy_install-dayrGH/Twisted-14.0.0.tar.bz2

Haha,that's because you already have installed the package!

UserWarning: You do not have the service_identity module installed.

sudo pip install service_identity

That's all for now.Thank u for viewing.

升级python和安装pip,easy_install和setuptool

新机子装环境什么的最麻烦了，在此记录一下python的升级和包(模块)管理软件

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