make: crystal: Command not found
Using /usr/lib/llvm5/bin/llvm-config [version=5.0.2]
CRYSTAL_CONFIG_LIBRARY_PATH="" CRYSTAL_CONFIG_BUILD_COMMIT="7e3de2a96e" ./bin/crystal build --verbose --target aarch64-alpine-linux-musl  -D preview_overflow -D compiler_rt --release --progress --threads 16 --link-flags="-Wl,--as-needed"  -o .build/crystal src/compiler/crystal.cr -D without_openssl -D without_zlib
[1/13] Parse                             
[1/13] Parse                             
[2/13] Semantic (top level)              
Error in src/compiler/crystal.cr:6: while requiring "./crystal/**"

require "./crystal/**"
^

in src/compiler/crystal/program.cr:1: while requiring "llvm"

require "llvm"
^

in src/llvm.cr:1: while requiring "./llvm/**"

require "./llvm/**"
^

in src/llvm/di_builder.cr:1: while requiring "./lib_llvm"

require "./lib_llvm"
^

in src/llvm/lib_llvm.cr:1: expanding macro

{% begin %}
^

in src/llvm/lib_llvm.cr:4: error executing command: [ -n "$LLVM_CONFIG" ] && command -v "$LLVM_CONFIG" || command -v llvm-config-8 || command -v llvm-config-8.0 || command -v llvm-config80 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 8.0*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-7 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 7.1*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-7.0 || command -v llvm-config70 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 7.0*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-6.0 || command -v llvm-config60 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 6.0*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-5.0 || command -v llvm-config50 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 5.0*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-4.0 || command -v llvm-config40 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 4.0*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-3.9 || command -v llvm-config39 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 3.9*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config-3.8 || command -v llvm-config38 || (command -v llvm-config > /dev/null && (case "$(llvm-config --version)" in 3.8*) command -v llvm-config;; *) false;; esac)) || command -v llvm-config
                  , got exit status 127

                  `[ -n "$LLVM_CONFIG" ] && command -v "$LLVM_CONFIG" || \
                  ^

make: *** [Makefile:132: .build/crystal] Error 1
>>> ERROR: crystal: build failed