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Hello Zoe, You should use the package install tools on Debian to install libpng (or any other missing libraries) for your distribution. On CentOS 7 you would do something like, $ sudo yum install libpng12.x86_64 libpng12-devel.x86_64 But like Ubuntu linux, I’m not sure that libpng12 is directly available in recent releases of Debian linux.  I found this link for getting and installing libpng12 for Debian,https://packages.ubuntu.com/xenial/amd64/libpng12-0/download Although we do not officially support building freesurfer on Debian Linux, it would be good to know what version of Debian linux you are running. - R.

On Aug 11, 2019, at 05:38, Hang Zeng <zenghang14@gmail.com> wrote:        External Email - Use Caution        Dear Sir or Madam,I am running preproc-sess command on Linux Debian. The thing is it shows error msg like '3dvolreg.afni error while loading shares library :libXp.so.6. No such file or directory. After I installed the libXp.so.6, other lib like libpng is required. I am wondering what might be the causes, and how to fix it. If it is indeed the problem of libs, can I have a list of the dependent libraries for that command? Best regards,Zoe_______________________________________________Freesurfer mailing listFreesurfer@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer