$ bazel build -c opt mediapipe/examples/desktop/hello_world:hello_world Starting local Bazel server and connecting to it... DEBUG: Rule 'build_bazel_rules_apple' indicated that a canonical reproducible form can be obtained by modifying arguments commit = "6c9fcae7a3597aabd43f28be89466afe0eab18de", shallow_since = "1565379803 -0700" and dropping ["tag"] DEBUG: Call stack for the definition of repository 'build_bazel_rules_apple' which is a git_repository (rule definition at /private/var/tmp/_bazel_faucherd/3a6923036fc899f82029b0fb9d70b802/external/bazel_tools/tools/build_defs/repo/git.bzl:181:18):

• /Users/faucherd/Documents/Personal/Machine_Learning/Google/mediapipe/WORKSPACE:251:1 ERROR: /private/var/tmp/_bazel_faucherd/3a6923036fc899f82029b0fb9d70b802/external/local_config_cc/BUILD:46:1: in cc_toolchain_suite rule @local_config_cc//:toolchain: cc_toolchain_suite '@local_config_cc//:toolchain' does not contain a toolchain for cpu 'darwin_x86_64' ERROR: Analysis of target '//mediapipe/examples/desktop/hello_world:hello_world' failed; build aborted: Analysis of target '@local_config_cc//:toolchain' failed; build aborted INFO: Elapsed time: 58.077s INFO: 0 processes. FAILED: Build did NOT complete successfully (53 packages loaded, 1164 targets configured)

Thank you @jiuqiant. I did not have Xcode installed. I installed Xcode and got closer but still received a (different) error.

$ bazel run --verbose_failures --define MEDIAPIPE_DISABLE_GPU=1 mediapipe/examples/desktop/hello_world:hello_world DEBUG: Rule 'build_bazel_rules_apple' indicated that a canonical reproducible form can be obtained by modifying arguments commit = "6c9fcae7a3597aabd43f28be89466afe0eab18de", shallow_since = "1565379803 -0700" and dropping ["tag"] DEBUG: Call stack for the definition of repository 'build_bazel_rules_apple' which is a git_repository (rule definition at /private/var/tmp/_bazel_faucherd/3a6923036fc899f82029b0fb9d70b802/external/bazel_tools/tools/build_defs/repo/git.bzl:181:18):

• /Users/faucherd/Documents/Personal/Machine_Learning/Google/mediapipe/WORKSPACE:251:1 INFO: Analyzed target //mediapipe/examples/desktop/hello_world:hello_world (0 packages loaded, 0 targets configured). INFO: Found 1 target... ERROR: /private/var/tmp/_bazel_faucherd/3a6923036fc899f82029b0fb9d70b802/external/zlib_archive/BUILD.bazel:5:1: undeclared inclusion(s) in rule '@zlib_archive//:zlib': this rule is missing dependency declarations for the following files included by 'external/zlib_archive/uncompr.c':