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unportable's Usage Examples:

optimized for machines with 64 byte cache lines, making them essentially unportable without a significant rewrite.

used on many different types of computer systems, and which methods were unportable.

operating systems use different command-line interpreters this can lead to unportable makefiles.

These libraries reduce the need to use unportable operating system features and third-party libraries (which might not always.

The program code itself can also contain unportable things, like the paths of include files.

III included machine-dependent features that made code written in it unportable from machine to machine.

so much that the Scheme Steering Committee calls it "the world"s most unportable programming language" and "a family of dialects" rather than a single.

kernels, the UNSW kernels (written in a mixture of assembly and C) were unportable and each implemented from scratch.