Applying ./patches/020-std.patch using plaintext: 
patching file src/network/network.cc
configure: WARNING: unrecognized options: --disable-nls
configure: loading site script /builder/shared-workdir/build/sdk/include/site/arm
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for arm-openwrt-linux-strip... arm-openwrt-linux-muslgnueabi-strip
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for arm-openwrt-linux-cc... arm-openwrt-linux-muslgnueabi-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether arm-openwrt-linux-muslgnueabi-gcc accepts -g... yes
checking for arm-openwrt-linux-muslgnueabi-gcc option to accept ISO C89... none needed
checking whether arm-openwrt-linux-muslgnueabi-gcc understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of arm-openwrt-linux-muslgnueabi-gcc... gcc3
checking whether we are using the GNU C++ compiler... yes
checking whether arm-openwrt-linux-muslgnueabi-g++ accepts -g... yes
checking dependency style of arm-openwrt-linux-muslgnueabi-g++... gcc3
checking for arm-openwrt-linux-ranlib... arm-openwrt-linux-muslgnueabi-gcc-ranlib
checking for protoc... no
configure: error: cannot find protoc, the Protocol Buffers compiler
make[3]: *** [Makefile:120: /builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a8+vfpv3_musl_eabi/mosh-1.3.2/.configured_68b329da9893e34099c7d8ad5cb9c940] Error 1
time: package/feeds/packages/mosh/compile#1.11#0.43#2.25