$ cargo fuzz run api_calls                        
   Compiling wasm-spec-interpreter v0.0.0 (/home/remo/repos/wasmtime/crates/fuzzing/wasm-spec-interpreter)
error: failed to run custom build command for `wasm-spec-interpreter v0.0.0 (/home/remo/repos/wasmtime/crates/fuzzing/wasm-spec-interpreter)`

Caused by:
  process didn't exit successfully: `/home/remo/repos/wasmtime/target/release/build/wasm-spec-interpreter-c2b4c9022818c7c1/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-changed=ocaml/interpret.ml
  cargo:rerun-if-changed=ocaml/Makefile
  make -C spec/interpreter libopt
  make[1]: Entering directory '/home/remo/repos/wasmtime/crates/fuzzing/wasm-spec-interpreter/ocaml/spec/interpreter'
  ls binary/decode.ml binary/decode.mli binary/encode.ml binary/encode.mli binary/utf8.ml binary/utf8.mli exec/eval.ml exec/eval.mli exec/eval_num.ml exec/eval_num.mli exec/eval_vec.ml exec/eval_vec.mli exec/f32_convert.ml exec/f32_convert.mli exec/f32.ml exec/f64_convert.ml exec/f64_convert.mli exec/f64.ml exec/fxx.ml exec/i16.ml exec/i32_convert.ml exec/i32_convert.mli exec/i32.ml exec/i64_convert.ml exec/i64_convert.mli exec/i64.ml exec/i8.ml exec/ixx.ml exec/v128.ml exec/v128.mli host/env.ml host/spectest_isa.ml host/spectest.ml main/flags.ml main/main.ml runtime/func.ml runtime/func.mli runtime/global.ml runtime/global.mli runtime/instance.ml runtime/memory.ml runtime/memory.mli runtime/table.ml runtime/table.mli script/import.ml script/import.mli script/js.ml script/js.mli script/run.ml script/run.mli script/script.ml syntax/ast.ml syntax/free.ml syntax/free.mli syntax/operators.ml syntax/types.ml syntax/values.ml tests/smallint.ml text/arrange.ml text/arrange.mli text/lexer.mli text/lexer.mll text/parse.ml text/parse.mli text/parser.mly text/print.ml text/print.mli util/error.ml util/error.mli util/lib.ml util/lib.mli util/sexpr.ml util/sexpr.mli util/source.ml util/source.mli valid/valid.ml valid/valid.mli verified/WasmRef_Isa_m.ml verified_wrapper/ast_convert.ml verified_wrapper/f32Wrapper_convert.ml verified_wrapper/f32Wrapper.ml verified_wrapper/f64Wrapper_convert.ml verified_wrapper/f64Wrapper.ml verified_wrapper/i32Wrapper_convert.ml verified_wrapper/i64Wrapper_convert.ml verified_wrapper/implWrapper.ml verified_wrapper/libAux.ml verified_wrapper/v128Wrapper.ml \
        | sed 's:\(.*/\)\{0,1\}\(.*\)\.[^\.]*:\2:' \
        | grep -v main \
        | sort | uniq \
        >wasm.mlpack
  echo >_tags "true: bin_annot"
  echo >>_tags "true: debug"
  echo >>_tags "true: optimize(classic)"
  echo >>_tags "<{util,syntax,binary,text,valid,runtime,exec,script,host,main,tests,verified,verified_wrapper}/*.cmx>: for-pack(Wasm)"
  ocamlbuild -use-ocamlfind -lexflags -ml -cflags '-w +a-3-4-8-11-20-26-27-32-39-42-44-45-70 -warn-error -unboxed-types' -I util -I syntax -I binary -I text -I valid -I runtime -I exec -I script -I host -I main -I tests -I verified -I verified_wrapper -pkgs zarith -libs bigarray -quiet wasm.cmx
  rm wasm.mlpack _tags
  make[1]: Leaving directory '/home/remo/repos/wasmtime/crates/fuzzing/wasm-spec-interpreter/ocaml/spec/interpreter'

  --- stderr
  make[1]: ocamlbuild: No such file or directory
  make[1]: *** [Makefile:101: _build/wasm.cmx] Error 127
  make: *** [Makefile:33: spec/interpreter/_build/wasm.cmxa] Error 2
  thread 'main' panicked at 'Failed to build the OCaml library using 'make'.', crates/fuzzing/wasm-spec-interpreter/build.rs:59:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Error: failed to build fuzz script: ASAN_OPTIONS="detect_odr_violation=0" RUSTFLAGS="-Cpasses=sancov-module -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-inline-8bit-counters -Cllvm-args=-sanitizer-coverage-pc-table -Cllvm-args=-sanitizer-coverage-trace-compares --cfg fuzzing -Clink-dead-code -Zsanitizer=address -Cllvm-args=-sanitizer-coverage-stack-depth -Cdebug-assertions -C codegen-units=1" "cargo" "build" "--manifest-path" "/home/remo/repos/wasmtime/fuzz/Cargo.toml" "--target" "x86_64-unknown-linux-gnu" "--release" "--bin" "api_calls"