I am getting error while doing make GCC(Makefile:4999: recipe for target 'configure-stage1-gmp' failed)

Question

These are the steps i followed for installing GCC

1. Downloaded & extracted GCC, GMP, MPFR, MPC(latest versions).
2. renamed GMP,MPFR,MPC without versions and moved GMP, MPFR, MPC to source folder of GCC
3. took path of GCC and exported library "export LD_LIBRARY_PATH=LIBRARY_PATH:/usr/local/lib"
4. took path of GMP and configured and installed (./configure ; make ; make check ; make install )
5. took path of MPFR and configured and installed (./configure ; make ; make check ; make install )
6. took path of MPC and configured and installed (./configure ; make ; make check ; make install )
7. GMP, MPFR, MPC configured and installed successfully
8. created directories gccbuild & gccbin outside GCC

9. took path of gccbuild

10. configuring GCC

11. sudo ../gcc-6.3.0/configure --prefix=/home/GCC_project/gccbin --enable-languages=c --program-suffix=6.3.0

12. configure completed successfully but when doing "make" i am getting the following error

    configure: error: source directory already configured; run "make distclean" there first
    Makefile:4999: recipe for target 'configure-stage1-gmp' failed
    make[2]: *** [configure-stage1-gmp] Error 1
    make[2]: Leaving directory '/home/GCC_Project/gccbuild'
    Makefile:23312: recipe for target 'stage1-bubble' failed
    make[1]: *** [stage1-bubble] Error 2
    make[1]: Leaving directory '/home/GCC_Project/gccbuild'
    Makefile:919: recipe for target 'all' failed
    make: *** [all] Error 2
    

13. i have tried "make distclean" before make, again iam getting same error