UT theoretical chemistry code forum

Dear Prof. Dr. Henkelman,
I'm trying to compile VASP.5.2.12 with bdrpro.F to perform DOS projection in Bader volumes. But I have encountered a problem during the linking period.
It always shows the following error message:

main.o: In function `MAIN__':
main.f90:(.text+0x3d8d3): undefined reference ...