tce-load -i compiletc cmake python libxml2-dev libffi-dev

[will not compile in 4gb]

cd llvm-4.0.1.src

mkdir build
cd build

cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe" -DCMAKE_CXX_FLAGS_RELEASE="-flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe -D_GLIBCXX_USE_C99_MATH" -DCMAKE_INSTALL_PREFIX=/usr/local -DLLVM_ENABLE_FFI=ON -DLLVM_BUILD_LLVM_DYLIB=ON -DLLVM_LINK_LLVM_DYLIB=ON -DLLVM_TARGETS_TO_BUILD="host;AMDGPU" -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE -DLLVM_BINUTILS_INCDIR=/usr/local/include -Wno-dev ../

make [55m 12.66s]
sudo make install

[links against ncursesw without ncursesw-dev]