Linux编译libpng时，报/libpng.so: undefined reference to `*'

[u010589898]

安装完成libpng
编译GD时，libpng报错
/usr/local/lib/libpng.so: undefined reference to `inflateReset'
/usr/local/lib/libpng.so: undefined reference to `inflateEnd'
/usr/local/lib/libpng.so: undefined reference to `floor'
/usr/local/lib/libpng.so: undefined reference to `trunc'
/usr/local/lib/libpng.so: undefined reference to `deflate'
/usr/local/lib/libpng.so: undefined reference to `inflate'
/usr/local/lib/libpng.so: undefined reference to `crc32'
/usr/local/lib/libpng.so: undefined reference to `deflateEnd'
/usr/local/lib/libpng.so: undefined reference to `deflateReset'
/usr/local/lib/libpng.so: undefined reference to `inflateInit_'
/usr/local/lib/libpng.so: undefined reference to `deflateInit2_'
/usr/local/lib/libpng.so: undefined reference to `pow'
/usr/local/lib/libpng.so: undefined reference to `adler32'

为什么会这样？具体怎么解决？