It looks like FreeBSD should do what OpenBSD does in femtolisp's code.
The biggest change here (I think) is that of determining the correct
value of CC in the Makefile(s). As of version 10, FreeBSD's base
compiler is clang; so there is now some logic in the Makefile(s) to
determine if the build is occurring on a FreeBSD system >= 10.0. If
so, then the value of CC will be "clang"; otherwise, it will be "gcc",
as before.
some cleanup
moving some library code around for size optimization
now using == instead of flt_equals for float comparison, mostly
for hash compatibility
better text representation of infs and nans
removing construction of low-level numeric types directly from strings
adding hash function corresponding to equal
better way to initialize builtins
moving advanced bitvector ops to separate compilation unit
rearranging hash table code so it can be specialized for different
comparison functions
one good way to bloat a piece of software is to add several
ASCII pictures of the mona lisa
Rick Hanson