clisp 2.49 build fails with clang

[ahelfer1971@…]

building clasp 2.49 fails with mac lion and clang. This workaround works:

sudo port clean foo
sudo port install foo configure.compiler=llvm-gcc-4.2

stack trace of failure:

:info:build ;;  Loading file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-methcomb1.fas ...
:info:build WARNING: in (SETF METHOD-COMBINATION-CHECK-OPTIONS) : 
:info:build NEW-VALUE is neither declared nor bound,
:info:build it will be treated as if it were declared SPECIAL.
:info:build ;;  Loaded file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-methcomb1.fas
:info:build ;;  Loading file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-genfun1.fas ...
:info:build ;;  Loaded file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-genfun1.fas
:info:build ;;  Loading file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-genfun2a.fas ...
:info:build ;;  Loaded file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-genfun2a.fas
:info:build ;;  Loading file /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src/clos-methcomb2.fas ...
:info:build *** - (SETF METHOD-COMBINATION-CHECK-OPTIONS): variable NEW-VALUE has no value
:info:build Bye.
:info:build make: *** [lispinit.mem] Error 1
:info:build shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_clisp/clisp/work/clisp-2.49/src" && ulimit -s 16384 && make " returned error 2
:error:build Target org.macports.build returned: shell command failed (see log for details)
:debug:build Backtrace: shell command failed (see log for details)
    while executing
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"
:info:build Warning: the following items did not execute (for clisp): org.macports.activate org.macports.build org.macports.destroot org.macports.install

[ahelfer1971@…]

build log