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#method 1
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## install steps
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```
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wget https://www.musl-libc.org/releases/musl-1.1.21.tar.gz
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tar zxf musl-1.1.21.tar.gz
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cd musl-1.1.21/
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./configure --prefix=/home/rcore/env/musl-install
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make && make install
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cd /home/rcore/env/musl-install/bin
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ln -s musl-gcc x86_64-linux-musl-gcc
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```
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# method 2
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## step 1: build musl-gcc with gcc-6.4+musl-1.1.21
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```
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git clone https://github.com/richfelker/musl-cross-make.git
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cp config.mak.dist config.mak
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# add two line in config.mak
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TARGET = x86_64-linux-musl
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OUTPUT = /usr/local
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make && sudo make install
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```
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## step 2: remove ubuntu musl* packages
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```
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sudo apt remove musl*
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```
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## step 3: use x86_64-linux-musl-gcc to rebuild sfsimg
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```
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# change rcore_plus/user/biscuit/CMakeLists.txt LINE:35
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set(PREFIX x86_64-linux-musl-)
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cd usr && make clean && make sfsimg arch=x86_64
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cd ../kernel && make run arch=x86_64
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```
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## final test
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```
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# in qemu
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biscuit/ls ##should work now
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```
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