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These instructions may be helpful for MacOS.

The first problem you encounter may be that the header Python.h cannot be found. It may be necessary to edit the file qcc/WORKSPACE and modify the 'external repository', pointing to your Python installation. For example:

[...]
new_local_repository(
    name = "third_party_python",
    path = "[system path]/Python/3.7/include/python3.7m",
    build_file = __workspace_dir__ + "/python.BUILD",
)

With a corresponding file python.BUILD. You have to ensure that the paths are set according to your machine setup:

package(
    default_visibility = ["//visibility:public"]
)

cc_library(
    name = "python",
    srcs = [
    ],
    hdrs = glob([
        "**/*.h",
    ]),
    includes = [""],
)

The BUILD file qcc/src/lib/BUILD should already point and use this external repository:

cc_library(
    name = "xgates",
    srcs = [
	"xgates.cc",
    ],
    copts = [
        "-O3",
        "-ffast-math",
        "-march=skylake",
        "-DNPY_NO_DEPRECATED_API",
        "-DNPY_1_7_API_VERSION",
    ],
    deps = [
	"@third_party_numpy//:numpy",
	"@third_party_python//:python",
    ],
)

On MacOS it appears to make a difference whether or not the command-line option -c opt is passed to build targets. For example the file runall.sh uses this flag.

Run these commands to verify things work as expected. Replace ... with the appropriate path in your system.

# This should build libqgates.so in .../qcc/bazel-bin/src/lib
# Some systems require 
#    bazel build -c opt [target]
# on all build/run targets.

cd .../qcc/src/lib
bazel build xgates

# Set PYTHONPATH to point to this directory
export PYTHONPATH=.../qcc/bazel-bin/src/lib

# Test it
bazel run circuit_test

# Test all tests
bazel test ...

# Run all the algorithms
cd .../qcc/src
./runall.sh