Hi Yaoiyao,
about Irrlicht, it depends, which library you want to create, static or shared, both will work fine, as long as you don't forget to adjust the environment variable afterwards. This is based on Linux, but the logic should work on Windows OS the one you are using.
1. if you want to build a shared library go to ../irrlicht-1.8.5/source/Irrlicht/
2. at that directory you will find a file named Makefile that can be edited.
3. Edit the Makefile and add -fPIC at the end of the CFLAGS and CXXFLAGS line, then type:
make clean
make sharedlib
4. It will create a file named libIrrlicht.so.1.8 it can be renamed into libIrrlicht.so.1.8.5, with this you can link this library when you build Project Chrono and enabling Irrlicht module.
Option:
1. If you want to create static library (libIrrlicht.a) go to ../irrlicht-1.8.5/source
2. Then type
make
3. You can see now that under ../irrlicht-1.8.5/lib/Linux there is a static library (but in your case it should be Windows since you are not using Linux)
This is a link to learn a bit about SO file in Linux and DLL in windows:
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