BUILD

# third_party/glfw/glfw.BUILD
...
cc_library(
    name = "glfw_src",
    srcs = COMMON_SRCS + select({
        "@bazel_tools//src/conditions:windows": WIN32_SRCS,
        "@bazel_tools//src/conditions:linux_x86_64": LINUX_SRCS,
    }),
    hdrs = COMMON_HDRS + select({
        "@bazel_tools//src/conditions:windows": WIN32_HDRS,
        "@bazel_tools//src/conditions:linux_x86_64": LINUX_HDRS,
    }),
    defines = select({
        "@bazel_tools//src/conditions:windows": WIN32_DEFINES,
        "@bazel_tools//src/conditions:linux_x86_64": LINUX_DEFINES,
    }),
)