Make sure the build system honors C_INCLUDE_PATH and LIBRARY_PATH when
looking for headers and libraries.

--- a/setup.py	2015-10-07 23:32:58.891329173 +0200
+++ b/setup.py	2015-10-07 23:46:29.653349924 +0200
@@ -676,15 +676,15 @@
         # if a file is found in one of those directories, it can
         # be assumed that no additional -I,-L directives are needed.
         if not CROSS_COMPILING:
-            self.lib_dirs = self.compiler.library_dirs + system_lib_dirs
-            self.inc_dirs = self.compiler.include_dirs + system_include_dirs
+            self.lib_dirs = os.getenv('LIBRARY_PATH', '').split(os.pathsep)
+            self.inc_dirs = os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
         else:
             # Add the sysroot paths. 'sysroot' is a compiler option used to
             # set the logical path of the standard system headers and
             # libraries.
-            self.lib_dirs = (self.compiler.library_dirs +
+            self.lib_dirs = (os.getenv('CROSS_LIBRARY_PATH', '').split(os.pathsep) +
                              sysroot_paths(('LDFLAGS', 'CC'), system_lib_dirs))
-            self.inc_dirs = (self.compiler.include_dirs +
+            self.inc_dirs = (os.getenv('CROSS_C_INCLUDE_PATH', '').split(os.pathsep) +
                              sysroot_paths(('CPPFLAGS', 'CFLAGS', 'CC'),
                                            system_include_dirs))
 
da15b4a7a8176d616ec92f8'>commit</a><a href='/guix/diff/etc/disarchive-manifest.scm?id=5a6b1a55869c488c0da15b4a7a8176d616ec92f8'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/disarchive-manifest.scm'>
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<div class='path'>path: <a href='/guix/log/?id=5a6b1a55869c488c0da15b4a7a8176d616ec92f8'>root</a>/<a href='/guix/log/etc?id=5a6b1a55869c488c0da15b4a7a8176d616ec92f8'>etc</a>/<a href='/guix/log/etc/disarchive-manifest.scm?id=5a6b1a55869c488c0da15b4a7a8176d616ec92f8'>disarchive-manifest.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/disarchive-manifest.scm?id=5a6b1a55869c488c0da15b4a7a8176d616ec92f8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-10-08 23:43:49 +0200'>2023-10-08</span></td><td><a href='/guix/commit/etc/disarchive-manifest.scm?id=aa65f31ed2a36a57f047651ff429eb9a7dfb0dcc'>disarchive-manifest: Add one manifest entry per tarball.</a><span class='msg-avail'>...<span class='msg-tooltip'>This works around a situation where ‘cuirass remote-worker’ now builds
with max-jobs = 1 (Cuirass commit
980ef610989895be5ac2ba7f9d1901e5c7f22934).  The effect is that all
.dis.drv would be performed sequentially, on a single machine (‘cuirass
remote-server’ is unable to distribute those derivations to several
machines because it only “sees” the ‘disarchive-collection’ derivation).
This would take a lot of time and force a rebuild of all of *.dis.drv
every time because their build results would not be retrieved by the
‘remote-server’ process.

* etc/disarchive-manifest.scm (disarchive-collection): Remove.
&lt;top level&gt;: Define ‘disarchives’.  Append it to the entries of the
manifest.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-08-06 23:14:41 +0200'>2022-08-06</span></td><td><a href='/guix/commit/etc/disarchive-manifest.scm?id=eab5366e679c149cf0a5abeb9a196700b171d9da'>disarchive-manifest: Exclude the Chromium tarball.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/disarchive-manifest.scm (disarchive-collection): Exclude
"chromium-" tarballs.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-08-05 15:28:02 +0200'>2022-08-05</span></td><td><a href='/guix/commit/etc/disarchive-manifest.scm?id=6d4a0ccecb58c62a95f7f36fa2f4fa53dd52312e'>disarchive-manifest: Filter out origins without a hash.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/disarchive-manifest.scm (disarchive-collection): Filter out
origins with a phony hash.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-08-05 00:14:29 +0200'>2022-08-05</span></td><td><a href='/guix/commit/etc/disarchive-manifest.scm?id=2acffd56a58c01785ea6ea738b79991c0685d364'>disarchive-manifest: Handle tar.xz archives.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/disarchive-manifest.scm (tarball-origin?): Add ".tar.xz".
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-10-09 01:02:18 +0200'>2021-10-09</span></td><td><a href='/guix/commit/etc/disarchive-manifest.scm?id=2ad1ef844632b7605ad6dd362e947a122a0a3925'>disarchive-manifest: Provide valid 'version' string.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/disarchive-manifest.scm &lt;top level&gt;: Turn 'version' field into a
string.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-09-14 11:50:58 +0200'>2021-09-14</span></td><td><a href='/guix/commit/etc/disarchive-manifest.scm?id=98712c14fe3517a48603a12eb2e64db305a54fe5'>etc: Add 'disarchive-manifest.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/disarchive-manifest.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>