linux下为php添加iconv模块的方法

./configure --with-mysql=/backup/mysql --with-freetype-dir --with-jpeg-dir --with-png-dir --with-zlib --with-curl --with-gd --enable-gd-native-ttf --with-apxs2=/usr/local/apache/bin/apxs --enable-sockets --with-iconv
make时提示：
复制代码代码如下:
.....................................................
ext/iconv/.libs/iconv.o（.text+0x1738）: In function `zif_iconv_mime_encode":
/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1017: undefined reference to `libiconv_open"
ext/iconv/.libs/iconv.o（.text+0x1756）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1031: undefined reference to `libiconv_open"
ext/iconv/.libs/iconv.o（.text+0x1993）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1290: undefined reference to `libiconv_close"
ext/iconv/.libs/iconv.o（.text+0x19ad）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1293: undefined reference to `libiconv_close"
ext/iconv/.libs/iconv.o（.text+0x1b01）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1102: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x1b33）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1134: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x1b5e）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1150: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x1e10）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1202: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x1e3c）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1233: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x207f）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:1277: more undefined references to `libiconv" follow
ext/iconv/.libs/iconv.o（.text+0x2c08）: In function `php_iconv_stream_filter_dtor":
/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:2393: undefined reference to `libiconv_close"
ext/iconv/.libs/iconv.o（.text+0x2cf2）: In function `php_iconv_stream_filter_append_bucket":
/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:2543: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x2d34）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:2543: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x2de7）:/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:2465: undefined reference to `libiconv"
ext/iconv/.libs/iconv.o（.text+0x30e2）: In function `php_iconv_stream_filter_factory_create":
/home/jjdai/work/zhupiter/php-5.2.0/ext/iconv/iconv.c:2419: undefined reference to `libiconv_open"
collect2: ld returned 1 exit status
make: *** [sapi/cli/php] Error 1

解决方法
复制代码代码如下:
wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.13.1.tar.gz
tar -zxvf libiconv-1.13.1.tar.gz
cd libiconv-1.13.1
./configure --prefix=/usr/local/libiconv
make
make install

再检查php
复制代码代码如下:
#./configure --with-mysql=/backup/mysql --with-freetype-dir --with-jpeg-dir --with-png-dir --with-zlib --with-curl --with-gd --enable-gd-native-ttf --with-apxs2=/usr/local/apache/bin/apxs --enable-sockets --with-iconv=/usr/local/libiconv
#make
#make install

另一种解决方法为去除iconv模块也能正常编译php，如下：
編輯 Makefile 大約 77 行左右的地方:
EXTRA_LIBS = ..... -lcrypt
在最後加上 -liconv，例如:
EXTRA_LIBS = ..... -lcrypt -liconv
再运行make就可以了。