Respect the order of paths defined in /etc/env.d/*, so that
packages like llvm can rely on ordering relative to paths
defined in /etc/env.d/50baselayout since baselayout-2.6.

See: 
https://gitweb.gentoo.org/proj/baselayout.git/commit/?id=277e5b9e55717873b87eb541a95f4f2ae0c60a4d
Bug: https://bugs.gentoo.org/667662
Signed-off-by: Zac Medico <zmed...@gentoo.org>
---
 lib/portage/package/ebuild/doebuild.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/portage/package/ebuild/doebuild.py 
b/lib/portage/package/ebuild/doebuild.py
index 941a597e2..621fe7360 100644
--- a/lib/portage/package/ebuild/doebuild.py
+++ b/lib/portage/package/ebuild/doebuild.py
@@ -212,6 +212,7 @@ def _doebuild_path(settings, eapi=None):
        eprefix = portage.const.EPREFIX
        prerootpath = [x for x in settings.get("PREROOTPATH", "").split(":") if 
x]
        rootpath = [x for x in settings.get("ROOTPATH", "").split(":") if x]
+       rootpath_set = frozenset(rootpath)
        overrides = [x for x in settings.get(
                "__PORTAGE_TEST_PATH_OVERRIDE", "").split(":") if x]
 
@@ -243,7 +244,10 @@ def _doebuild_path(settings, eapi=None):
 
        for prefix in prefixes:
                for x in ("usr/local/sbin", "usr/local/bin", "usr/sbin", 
"usr/bin", "sbin", "bin"):
-                       path.append(os.path.join(prefix, x))
+                       # Respect order defined in ROOTPATH
+                       x_abs = os.path.join(prefix, x)
+                       if x_abs not in rootpath_set:
+                               path.append(x_abs)
 
        path.extend(rootpath)
        settings["PATH"] = ":".join(path)
-- 
2.16.4


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