之前在同一台机器上安装squid 3.4.8 没任何问题，因做测试卸载了很多次squid,这次安装竟然报错，在网上找到了解决办法
../libltdl/.libs/libltdlc.a(libltdlcS.o):(.data.rel.ro+0x28): undefined reference to `dlopen_LTX_get_vtable'
collect2: ld returned 1 exit status
libtool: link: rm -f ".libs/squidS.o"
make[3]: *** [squid] 错误 1
make[3]: Leaving directory `/data/software/squid-3.1.18/src'
make[2]: *** [all-recursive] 错误 1
make[2]: Leaving directory `/data/software/squid-3.1.18/src'
make[1]: *** [all] 错误 2
make[1]: Leaving directory `/data/software/squid-3.1.18/src'
make: *** [all-recursive] 错误 1
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解决办法，重新下载包，解压安装