title: How to fix Cygwin error: while loading shared libraries: cygproj-13.dll: cannot open shared object file?
body: <p>I have tried to run cdo sinfon command on Windows 7 cygwin -x86_64 environment but have consistently encountered with the following error. I have installed all required packages like gcc, gcc-gfortran, openssl, openssh, curl, zlib, netcdf, libnetcdf-devel, udunits-devel, proj-devel etc. I have run the following commands---</p>
  
  <p>SID@SID-PC ~
  $ cd /cygdrive/C/demo/tas</p>
  
  <p>SID@SID-PC /cygdrive/C/demo/tas
  $ PATH="$PATH:.:"</p>
  
  <p>SID@SID-PC /cygdrive/C/demo/tas
  $ cdo sinfon Ind.nc
  C:/demo/tas/cdo.exe: error while loading shared libraries: cygproj-13.dll: cannot open shared object file: No such file or directory</p>
  
  <p>SID@SID-PC /cygdrive/C/demo/tas
  $ uname -a
  CYGWIN_NT-6.1 SID-PC 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin</p>