How to compile libigl on a machine that could not download external dependencies

[hughkhu]

Describe your issue

I downloaded the source code of libigl and copied it to a linux machine that could not connect to the Internet. When I tried to compile a project with CMake commands like

option(LIBIGL_WITH_EMBREE "Use Embree" ON)
include(libigl)

, connection timed out error was reported during the download of embree.

I tried to pre-download embree and put it on the path "libigl/external", but nothing changed and cmake still tried to download embree and rasied timed out error.

How can I solve this problem? Also, I would like to ask if you can put the libigl dependencies in the source code in advance, instead of downloading these dependencies through cmake. Thank you for your help.

Checklist

• [x] I have read the bug report page
• [x] CMake issue: I have tried with a fresh clone/empty build directory

Platform

• [ ] Windows
• [ ] macOS
• [x] Linux

[jdumas]

If you are on a machine without internet, you should specify FETCHCONTENT_SOURCE_DIR_<uppercaseName> for each third-party dependency required by Lagrange, and point the to a locally downloaded folder with the right version of each dependency. You may also want to enable FETCHCONTENT_FULLY_DISCONNECTED to prevent CMake from trying to connect to internet.