./configure --prefix=/usr/local/php52
make时提示：
.....................................................
ext/iconv/.libs/iconv.o(.text+0x1738): In function `zif_iconv_mime_encode':
/usr/src/php-5.2.0/ext/iconv/iconv.c:1017: undefined reference to `libiconv_open'
ext/iconv/.libs/iconv.o(.text+0x1756):/usr/src/php-5.2.0/ext/iconv/iconv.c:1031: undefined reference to `libiconv_open'
ext/iconv/.libs/iconv.o(.text+0x1993):/usr/src/php-5.2.0/ext/iconv/iconv.c:1290: undefined reference to `libiconv_close'
ext/iconv/.libs/iconv.o(.text+0x19ad):/usr/src/php-5.2.0/ext/iconv/iconv.c:1293: undefined reference to `libiconv_close'
ext/iconv/.libs/iconv.o(.text+0x1b01):/usr/src/php-5.2.0/ext/iconv/iconv.c:1102: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x1b33):/usr/src/php-5.2.0/ext/iconv/iconv.c:1134: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x1b5e):/usr/src/php-5.2.0/ext/iconv/iconv.c:1150: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x1e10):/usr/src/php-5.2.0/ext/iconv/iconv.c:1202: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x1e3c):/usr/src/php-5.2.0/ext/iconv/iconv.c:1233: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x207f):/usr/src/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':
/usr/src/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':
/usr/src/php-5.2.0/ext/iconv/iconv.c:2543: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x2d34):/usr/src/php-5.2.0/ext/iconv/iconv.c:2543: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o(.text+0x2de7):/usr/src/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':
/usr/src/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：
#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
方法一：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
再检查php，指定 iconv的位置 --with-iconv=/usr/local/libiconv #./configure --prefix=/usr/local/php52 --with-iconv=/usr/local/libiconv #make #make install
再运行make就可以了。
最后一种方法：
#make ZEND_EXTRA_LIBS='-liconv'
#make install