Help with Intel fortran building error with PETSc

Hi,

I am using ifort version 15.0.1 to compile and build my code with the open source PETSc and MPI

Compiling has no error msg but during building, I got the errors below, though in the end the build completed with a working a.out. However, I'm still worried there's some underlying problems. What do these errors mean?

ipo: warning #11021: unresolved xcb_connection_has_error
        Referenced in /usr/lib64/libX11.so