. ../lib.sh
-# gdb, gnu debugger.
-link gdbinit ~/.gdbinit
+# gdb, GNU debugger.
+if installed gdb; then
+ link gdbinit ~/.gdbinit
+fi
# Maxima, a symbolic algebra program.
-link maxima ~/.maxima
+if installed maxima; then
+ link maxima ~/.maxima
+fi
+
+# perlcritic to check Perl programs for common problems.
+if installed perlcritic; then
+ link perl/perlcriticrc ~/.perlcriticrc
+fi