+AC_FUNC_MEMCMP
+AC_FUNC_VPRINTF
+AC_CHECK_FUNCS([memmem snprintf vsnprintf gettext isinf])
+
+
+## Optional tools for building documentation, website, extra fonts.
+
+# guile executable for some scripts
+STEPMAKE_GUILE(OPTIONAL)
+# perl for help2man.
+STEPMAKE_PERL(OPTIONAL)
+# mftrace for generating pfa's, pfb's
+STEPMAKE_PROGS(MFTRACE, pktrace mftrace, OPTIONAL, 1.0.9)
+# new makeinfo for multi-page website docs
+STEPMAKE_PROGS(MAKEINFO, makeinfo, OPTIONAL, 4.1)