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

--- Python-2.7.10/setup.py	2015-10-07 18:33:18.125153186 +0200
+++ Python-2.7.10/setup.py	2015-10-07 18:33:47.497347552 +0200
@@ -526,6 +526,10 @@ class PyBuildExt(build_ext):
             inc_dirs += ['/system/include', '/atheos/autolnk/include']
             inc_dirs += os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
 
+        # Always honor these variables.
+        lib_dirs += os.getenv('LIBRARY_PATH', '').split(os.pathsep)
+        inc_dirs += os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
+
         # OSF/1 and Unixware have some stuff in /usr/ccs/lib (like -ldb)
         if host_platform in ['osf1', 'unixware7', 'openunix8']:
             lib_dirs += ['/usr/ccs/lib']
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<div class='path'>path: <a href='/guix/log/?id=7e17784cbec1f3636d01af266ae0a2f9f6963ac5'>root</a>/<a href='/guix/log/gnu?id=7e17784cbec1f3636d01af266ae0a2f9f6963ac5'>gnu</a>/<a href='/guix/log/gnu/packages?id=7e17784cbec1f3636d01af266ae0a2f9f6963ac5'>packages</a>/<a href='/guix/log/gnu/packages/ocr.scm?id=7e17784cbec1f3636d01af266ae0a2f9f6963ac5'>ocr.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/gnu/packages/ocr.scm?id=7e17784cbec1f3636d01af266ae0a2f9f6963ac5&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-01-20 16:34:43 +0100'>2019-01-20</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=ff8a66bc611d62280d6882d44dd7ee3bd9955983'>gnu: ocrad: Update to 0.27.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (ocrad): Update to 0.27.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-05-02 12:32:52 +0200'>2017-05-02</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=915d7792acc4a4be7d063b55a27fafc4f7cc01d3'>gnu: ocrad: Update to 0.26.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (ocrad): Update to 0.26.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-30 01:30:16 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=6fd52309b8f52c9bb59fccffac53e029ce94b698'>gnu: Use HTTPS for almost all gnu.org HOME-PAGEs.</a><span class='msg-avail'>...<span class='msg-tooltip'>All HTTP gnu.org (and supported subdomain) HOME-PAGEs changed to HTTPS.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>