LLVM: the build instructions require cmake but cmake is only "Recommended".

[Jeremy Henty]

BLFS should list cmake as "Required" for LLVM, because the LLVM build instructions run cmake.

(NB: although LLVM still supports building with autoconf, ./configure reports that the next point version will remove this support.)

[Pierre Labastie]

I think this is exactly what recommended means, in this book. A dependency you need (now or later) for building according to book's instructions, but which can be avoided by other means (ie using autoconf in this case, or using some --disable-xxx switch). From Chapter 2, page "Notes on building software":

Recommended means that BLFS strongly suggests this package is installed first
for a clean and trouble-free build, that won't have issues either during the
build process, or at run-time. The instructions in the book assume these
packages are installed. Some changes or workarounds may be required if these
packages are not installed. 

So I'd be inclined to close as "invalid", but leaving open for discussion right now.

[bdubbs@…]

Marking as wontfix for the reasons Pierre has given.