This seems like the right thing to do, though I suppose one can
install these software packages from non-RPM sources. If this turns
out to be more of a curse than a blessing then just get rid of the
BuildRequires statements.
Group: System Environment/Kernel
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-buildroot
#Requires:
+BuildRequires: inotify-tools-devel
+BuildRequires: ocaml
+BuildRequires: ocaml-ocamldocs
Source0: vsys-%{version}.tar.gz