If you go to the `src` directory and open the `
mcmctree.c` file with your favourite text editor, you need to modify the following line:
E.g., if you are analysing 1850 taxa, perhaps increase this variable to 2000. Once you have changed the line (e.g.,
#define NS 2000), you can save this file. To recompile the program, open your terminal from the `src` directory, type the command `make -f Makefile`, and you will see that all the PAML programs will have been recompiled and new binaries will appear. You can then remove the output files (i.e., `rm *o`) and the other compiled binaries except for the `mcmctree` binary -- this binary will allow MCMCtree to parse input files that have up to 2000 taxa. You may then export the PATH to this binary as you previously had in your system environment, which will hopefully allow you to run MCMCtree without problems. You may also want to
check the PAML Wiki to make sure that your input files are in the correct format too.