RISC-V GNU Compiler Toolchain: Build Error

I am trying to build the "RISC-V GNU Compiler Toolchain" as a step for building the SDK for PULPissimio platform. When I try to execute the following command :

./configure --prefix=/opt/riscv
make linux

I got this error: 
/tmp/cczwQOyT.s: Assembler messages:
/tmp/cczwQOyT.s:5044: Error: unrecognized opcode `ldu a1,.LANCHOR0+2'
/tmp/cczwQOyT.s:5279: Error: unrecognized opcode `ldu a5,.LANCHOR0'
/tmp/cczwQOyT.s:5357: Error: unrecognized opcode `ldu a4,.LANCHOR0+2'
/tmp/cczwQOyT.s:6002: Error: unrecognized opcode `ldu a2,.LANCHOR0+2'
/tmp/cczwQOyT.s:6094: Error: unrecognized opcode `ldu a3,.LANCHOR0+2'
/home/ahmed/pulp-riscv-gnu-toolchain/riscv-gcc/libgcc/static-object.mk:17: recipe for target 'unwind-dw2.o' failed
make[2]: *** [unwind-dw2.o] Error 1
make[2]: Leaving directory '/home/ahmed/pulp-riscv-gnu-toolchain/build-gcc-linux-stage1/riscv64-unknown-linux-gnu/libgcc'
Makefile:11207: recipe for target 'all-target-libgcc' failed
make[1]: *** [all-target-libgcc] Error 2
make[1]: Leaving directory '/home/ahmed/pulp-riscv-gnu-toolchain/build-gcc-linux-stage1'
Makefile:150: recipe for target 'stamps/build-gcc-linux-stage1' failed
make: *** [stamps/build-gcc-linux-stage1] Error 2

I searched for a similar error but I found no solution for this. Hopefully someone will be able to help me solving this error as I am new linux user. 

Thanks in advance !

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RISC-V GNU Compiler Toolchain: Build Error - by AhmedZaky - 04-15-2019, 09:24 AM

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