I've encountered a minor bug in the configure script. I was trying to enable rational number support but the configure script kept reporting that rational numbers were not desired. It looks to me like setting RATIONAL_NUMBERS_WANTED=yes does in fact enable this feature, it's just not being reported. I believe the problem is in this snippet: (line 665 in configure.ac
# APL: support for rational numbers ?
AC_MSG_CHECKING([whether support for rational numbers is desired ])
[ enable support for rational numbers (see README-2-configure) default: no ])
if test "x$RATIONAL_NUMBERS_WANTED" = "xyes"; then
[ define to have support for rational numbers (EXPERIMENTAL!)])
At the bottom, the argument to AC_MSG_RESULT is $VISIBLE_MARKERS_WANTED where it seems to me it should be $RATIONAL_NUMBERS_WANTED (VISIBLE_MARKERS_WANTED is the previous option, maybe this block was duplicated and the AC_MSG_RESULT line was accidentally left unchanged). Indeed, after making these changes and generating a new configure script, the output changes depending on RATIONAL_NUMBERS_WANTED, as expected.