FreeSwitch在ubuntu下编译时无法编译libfreeswitch的问题

在使用Ubuntu进行编译Freeswitch时，会遇到无法编译libfreeswitch的情况。

Making all in .
......
./.libs/libfreeswitch.so: undefined reference to `inflateReset'
./.libs/libfreeswitch.so: undefined reference to `inflateEnd'
./.libs/libfreeswitch.so: undefined reference to `inflateInit2_'
./.libs/libfreeswitch.so: undefined reference to `inflate'
./.libs/libfreeswitch.so: undefined reference to `zlibVersion'
./.libs/libfreeswitch.so: undefined reference to `inflateInit_'
collect2: ld returned 1 exit status
make[2]: *** [freeswitch] Error 1

解决办法是修改使用autoconf生成的Makefile：

将SWITCH_AM_LDFLAGS = -lm -lz修改为SWITCH_AM_LDFLAGS = -lm 

在freeswitch_LDADD = libfreeswitch.la libs/apr/libapr-1.la \

    $(am__append_20) 后面加上-lz。