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Thank you so much this solves the problem without any hicupps ?

Your processor doesn't support aes which is in your CPU_FLAGS_86 and CFLAGS="- march=westmere" Building nettle with aes cpu flag set on gcc when your processor doesn't support aes could be the cause of the error. Reference: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html ‘westmere’ Intel Westmere CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, POPCNT, AES and PCLMUL instruction set support. Set to native and add the proper flags to match your processor. Install cpuid2cpuflags Follow my directions here starting at Remove any gcc override settings you've made previously. After you've finished configuring gcc to match your processor rebuild nettle.