首先下载wget源码wget-1.21.tar.gz，解压后，执行：./confiugre
结果提示错误：
- >>上面省略...<<
- checking for GNUTLS... no
- configure: error: Package requirements (gnutls) were not met:
-
- Package 'gnutls', required by 'virtual:world', not found
-
- Consider adjusting the PKG_CONFIG_PATH environment variable if you
- installed software in a non-standard prefix.
-
- Alternatively, you may set the environment variables GNUTLS_CFLAGS
- and GNUTLS_LIBS to avoid the need to call pkg-config.
- See the pkg-config man page for more details.
缺少gnutls库，用apt-cyg安装：apt-cyg install libgnutls-devel
再执行./configure，又出现不同的错误提示：
- >>上面省略...<<
- checking for GNUTLS... no
- configure: error: Package requirements (gnutls) were not met:
-
- Package 'nettle', required by 'gnutls', not found
- Package 'hogweed', required by 'gnutls', not found
- Package 'libtasn1', required by 'gnutls', not found
- Package 'p11-kit-1', required by 'gnutls', not found
-
- Consider adjusting the PKG_CONFIG_PATH environment variable if you
- installed software in a non-standard prefix.
-
- Alternatively, you may set the environment variables GNUTLS_CFLAGS
- and GNUTLS_LIBS to avoid the need to call pkg-config.
- See the pkg-config man page for more details.
提示还缺少被gnutls依赖的库，继续安装：
apt-cyg install libnettle-devel
apt-cyg install libtasn1-devel
apt-cyg install libp11-kit-devel
再次执行./configure，终于不报错了。
执行make后，在src目录下出现wget.exe，再运行wget.exe的时候，没想到会弹出好几个dll找不到的问题。去\cygwin64\bin目录下找了，拷贝到wget.exe所在的目录即可。
上面安装的依赖库还不够，还需要安装以下三个依赖库：
apt-cyg install libgnutls30
apt-cyg install libnettle6
apt-cyg install libhogweed4
一共有这么几个dll：cygffi-6.dll、cyggcc_s-seh-1.dll、cyggmp-10.dll、cyggnutls-30.dll、cyghogweed-4.dll、cygiconv-2.dll、cygidn2-0.dll、cygintl-8.dll、cygnettle-6.dll、cygp11-kit-0.dll、cygtasn1-6.dll、cygunistring-2.dll、cyguuid-1.dll、cygwin1.dll。