ROMS安装中Install NetCDF中./configure不懂

网站https://www.myroms.org/wiki/ROMS_Cygwin#Install_Cygwin
其中有一步——
· Start the compilation by typing the line below. It will take about 10 minutes. Enough to start a fresh batch of coffee.
_CC=gcc FC=gfortran-4 F77=gfortran-4 CPPFLAGS=-DpgiFortran ./configure
后面的./configure是什么意思啊？要怎么输入到cygwin中？