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--- a/tools/cpp/unix_cc_configure.bzl
+++ b/tools/cpp/unix_cc_configure.bzl
@@ -147,9 +147,18 @@ def get_escaped_cxx_inc_directories(repository_ctx, cc, additional_flags = []):
else:
inc_dirs = result.stderr[index1 + 1:index2].strip()
- return [_prepare_include_path(repository_ctx, _cxx_inc_convert(p))
- for p in inc_dirs.split("\n")]
+ default_inc_directories = [
+ _prepare_include_path(repository_ctx, _cxx_inc_convert(p))
+ for p in inc_dirs.split("\n")
+ ]
+
+ env = repository_ctx.os.environ
+ if "SPACK_INCLUDE_DIRS" in env:
+ for path in env["SPACK_INCLUDE_DIRS"].split(":"):
+ default_inc_directories.append(path)
+
+ return default_inc_directories
def _is_option_supported(repository_ctx, cc, option):
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