ビルドに必要なパスは通っている前提で。 > wget ftp://ftp.mozilla.org/pub/js/js-1.8.0-rc1.tar.gz > tar zxfv js-1.8.0-rc1.tar.gz > cd js/src > make -f Makefile.ref BUILD_OPT=1 > cd WINNT4.0_OPT.OBJ > js -v JavaScript-C 1.8.0 pre-release 1 2009-02-16 usage: js [-zKPswWxCi] [-b branchlimit] [-c stackchunksize] [-o option] [-v version] [-f scriptfile] [-e script] [-S maxstacksize] [scriptfile] [scriptarg...] なんだかあっさりビルド成功