`librocksdb-sys` fails to build with `from_cargo()`, succeeds with actual Cargo

[rejuvenile]

In my project, I use Cargo as the source of truth for dependencies. This allows me to build both with Bazel or with Cargo. librocksdb-sys fails to build on Bazel on macOS, but succeeds with the same workspace built from Cargo.

cargo:warning=ToolExecError: command did not execute successfully (status code exit status: 1): env -u IPHONEOS_DEPLOYMENT_TARGET LC_ALL="C" "/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/sandbox/darwin-sandbox/1103/execroot/_main/external/rules_cc++cc_configure_extension+local_config_cc/cc_wrapper.sh" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-gdwarf-2" "-fno-omit-frame-pointer" "--target=arm64-apple-macosx" "-mmacosx-version-min=26.1" "-I" "rocksdb/include/" "-I" "rocksdb/" "-I" "rocksdb/third-party/gtest-1.8.1/fused-src/" "-I" "snappy/" "-I" "/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/sandbox/darwin-sandbox/1103/execroot/_main/bazel-out/aarch64-darwin-fastbuild/bin/external/rules_rust++crate+crates__lz4-sys-1.11.1-lz4-1.10.0/_bs.out_dir/include" "-I" "/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/sandbox/darwin-sandbox/1103/execroot/_main/bazel-out/aarch64-darwin-fastbuild/bin/external/rules_rust++crate+crates__zstd-sys-2.0.16-zstd.1.5.7/_bs.cargo_runfiles/rules_rust++crate+crates__zstd-sys-2.0.16-zstd.1.5.7/zstd/lib" "-I" "/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/sandbox/darwin-sandbox/1103/execroot/_main/bazel-out/aarch64-darwin-fastbuild/bin/external/rules_rust++crate+crates__libz-sys-1.1.23/_bs.out_dir/include" "-I" "/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/sandbox/darwin-sandbox/1103/execroot/_main/bazel-out/aarch64-darwin-fastbuild/bin/external/rules_rust++crate+crates__bzip2-sys-0.1.13-1.0.8/_bs.out_dir/include" "-I" "." "-std=c++17" "-Wsign-compare" "-Wshadow" "-Wno-unused-parameter" "-Wno-unused-variable" "-Woverloaded-virtual" "-Wnon-virtual-dtor" "-Wno-missing-field-initializers" "-Wno-strict-aliasing" "-Wno-invalid-offsetof" "-include" "cstdint" "-std=c++17" "-DSNAPPY=1" "-DLZ4=1" "-DZSTD=1" "-DZLIB=1" "-DBZIP2=1" "-DNDEBUG=1" "-DOS_MACOSX" "-DROCKSDB_PLATFORM_POSIX" "-DROCKSDB_LIB_IO_POSIX" "-DROCKSDB_SUPPORT_THREAD_LOCAL" "-U_FORTIFY_SOURCE" "-fstack-protector" "-Wall" "-Wthread-safety" "-Wself-assign" "-Wunused-but-set-parameter" "-Wno-free-nonheap-object" "-fcolor-diagnostics" "-fno-omit-frame-pointer" "-std=c++17" "-mmacosx-version-min=26.1" "-no-canonical-prefixes" "-Wno-builtin-macro-redefined" "-D__DATE__=\"redacted\"" "-D__TIMESTAMP__=\"redacted\"" "-D__TIME__=\"redacted\"" "-o" "/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/sandbox/darwin-sandbox/1103/execroot/_main/bazel-out/aarch64-darwin-fastbuild/bin/external/rules_rust++crate+crates__librocksdb-sys-0.17.3-10.4.2/_bs.out_dir/24bbbf8ebb94fff2-db_ttl_impl.o" "-c" "rocksdb/utilities/ttl/db_ttl_impl.cc"cargo:warning=In file included from rocksdb/utilities/write_batch_with_index/write_batch_with_index.cc:11:
cargo:warning=In file included from rocksdb/db/column_family.h:18:
cargo:warning=In file included from rocksdb/db/memtable_list.h:16:
cargo:warning=In file included from rocksdb/db/memtable.h:21:
cargo:warning=In file included from rocksdb/db/merge_helper.h:13:
cargo:warning=In file included from rocksdb/db/range_del_aggregator.h:18:
cargo:warning=In file included from rocksdb/db/pinned_iterators_manager.h:12:
cargo:warning=In file included from rocksdb/table/internal_iterator.h:17:
cargo:warning=In file included from rocksdb/table/format.h:19:
cargo:warning=In file included from rocksdb/options/cf_options.h:14:
cargo:warning=rocksdb/util/compression.h:37:10: fatal error: 'snappy.h' file not found
cargo:warning=   37 | #include <snappy.h>
cargo:warning=      |          ^~~~~~~~~~
cargo:warning=1 error generated.

Note, snappy.h is included in the crate, so I'm not sure why it's not finding it.

/private/var/tmp/_bazel_user/2fe8fca154ecc4fd4bfcc2428eaf334c/external/rules_rust++crate+crates__librocksdb-sys-0.17.3-10.4.2/snappy/snappy.h

[rejuvenile]

The compiler command line does include "-I" "snappy/" and, again, snappy.h exists at ./external/rules_rust++crate+crates__librocksdb-sys-0.17.3-10.4.2/snappy/snappy.h, though perhaps that's not where the compiler is expecting it. Perhaps a cwd issue?