I must admit that I haven't tried `make LANGUAGES=pascal'. I only followed the GCC documentation. This is the relevant part of gcc-2.95.2/install/BUILD:
If you used the flag --enable-languages=... to restrict the compilers to be built, only those you've actually enabled will be built. This will of course only build those runtime libraries, for which the particular compiler has been built. Please note, that re-defining LANGUAGES when calling `make bootstrap' _*does not*_ work anymore!