There is nothing to fix, you just need to setup your CMake project correctly (enable `LIBIGL_WITH_TRIANGLE`, and link against the CMake target `igl::triangle`).

[jseamon2]

          There is nothing to fix, you just need to setup your CMake project correctly (enable `LIBIGL_WITH_TRIANGLE`, and link against the CMake target `igl::triangle`).

Originally posted by @jdumas in libigl/libigl#1635 (comment)

I'm fairly new to CMake. Where would I go to enable 'LIBIGL_WITH_TRIANGLE'? Is that just in one of the CMake files?

[alecjacobson]

Take a look here https://github.com/libigl/libigl-example-project/blob/main/CMakeLists.txt

There have been a few changes since the comments on that linked issue. You could either do

option(LIBIGL_RESTRICTED_TRIANGLE "Build target igl_restricted::triangle" ON)
include(libigl)

or

include(libigl)
igl_include(restricted triangle)

[jseamon2]

Thank you for the reply! I tried implementing both options you suggested with the CMakeLists from the example, but I keep getting the same build error. That build error says "Build step for triangle failed". Any suggestions on what I am doing wrong?

CMakeLists.txt

[alecjacobson]

Could you try this? and if it doesn't work, post an issue on that repo so it's easier to track

https://github.com/alecjacobson/libigl-example-triangle