They may have meant "compiled for Intel" rather than "compiled on Intel". In any case, you'd have to be using instructions or registers that are specific to one make in particular, rather than the common x86 standard.
Cross-compilation is possible anyway, so people have compiled on x86 programs intended to run on m68K or PowerPC, and vice-versa. Heck I use Windows 64, but when I compile GZDoom, ZDoom, SLADE or Eternity, it's technically cross-compilation since they're compiled as x86-32 programs rather than x86-64.
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