FreeBSD 5.4
apache2.0.55 php4.4.0 Mysql3.2.3

Making all in innbbsd
qp_conv.c:1:19: iconv.h: No such file or directory
qp_conv.c: In function `str_iconv':
qp_conv.c:71: error: syntax error before "iconv_descriptor"
qp_conv.c:78: error: `iconv_descriptor' undeclared (first use in this function)
qp_conv.c:78: error: (Each undeclared identifier is reported only once
qp_conv.c:78: error: for each function it appears in.)
qp_conv.c:80: error: `iconv_t' undeclared (first use in this function)
*** Error code 1

Stop in /usr/home/bbs/kbs_bbs/innbbsd.
*** Error code 1

在./configure中加入--enable-innbbsd
make时出现上面的错误，高手们是什么原因啊？
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