STEPMAKE_DLOPEN
# Do not use bison 1.50 and 1.75.
# 1.29 is required fr %locations, but I'm not sure it's enough --ns
-STEPMAKE_BISON(OPTIONAL, 1.29)
+STEPMAKE_BISON(REQUIRED, 1.29)
STEPMAKE_FLEX(REQUIRED)
STEPMAKE_FLEXLEXER(REQUIRED)
STEPMAKE_FLEXLEXER_LOCATION
# guile executable for some scripts
STEPMAKE_GUILE(OPTIONAL, 1.8.2, 1.9.0)
-# perl for help2man.
-STEPMAKE_PERL(OPTIONAL)
+# perl for help2man and for mf2pt1.pl
+STEPMAKE_PERL(REQUIRED)
## Optional tools for building documentation, website, extra fonts.
if test "$DOCUMENTATION" = "yes"; then