Add the hyperref package.

• Has to come before glossaries to enable glossary entries to be linked.
• Disable the ugly red borders in PDFs.

texmf/tex/latex/astron/astron.cls

@@ -17,6 +17,7 @@
 \RequirePackage[absolute]{textpos}
 \RequirePackage{fancyhdr}
 \RequirePackage{geometry}
+\RequirePackage[pdfborder={0 0 0}]{hyperref}
 \RequirePackage[nonumberlist,nogroupskip]{glossaries}
 \RequirePackage{graphicx}
 \RequirePackage{lastpage}