Problem building GCC and GMP

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http://www.linuxquestions.org – I'm stuck here: http://www.linuxfromscratch.org/lfs/...gcc-pass1.html I extracted the gcc, gmp, mpc, and mpfr archives, and moved the gmp, mpc, and mpfr directories into the gcc directory. ./configure is successful, but make fails: Code: <snip> checking for math/round... yes checking for math/trunc... yes checking for math/floor... yes checking for math/ceil... yes checking for math/rint... yes checking for long double... yes checking format of `long double' floating point... IEEE extended, little endian checking for gmp.h... no configure: error: gmp.h can't be found, or is unusab (HowTos)