Use 'uname -m', which in practice returns the processor architecture.

--- psm-3.3/buildflags.mak~	2014-08-20 21:00:18.000000000 +0100
+++ psm-3.3/buildflags.mak	2017-10-22 12:02:12.855291447 +0100
@@ -38,7 +38,7 @@
 endif
 
 export os ?= $(shell uname -s | tr '[A-Z]' '[a-z]')
-export arch := $(shell uname -p | sed -e 's,\(i[456]86\|athlon$$\),i386,')
+export arch := $(shell uname -m | sed -e 's,\(i[456]86\|athlon$$\),i386,')
 
 CC ?= gcc
 
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<div class='path'>path: <a href='/guix/log/?id=eac27d829df1945a32044898eb32138015c4cab1'>root</a>/<a href='/guix/log/gnu?id=eac27d829df1945a32044898eb32138015c4cab1'>gnu</a>/<a href='/guix/log/gnu/packages?id=eac27d829df1945a32044898eb32138015c4cab1'>packages</a>/<a href='/guix/log/gnu/packages/ocr.scm?id=eac27d829df1945a32044898eb32138015c4cab1'>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=eac27d829df1945a32044898eb32138015c4cab1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-08-29 17:49:58 +0200'>2022-08-29</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=608f9efc34aa31d00260fbed6845f2cc9a176b17'>gnu: tesseract-ocr: Propagate leptonica.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (tesseract-ocr)[inputs]: Move LEPTONICA ...
[propagated-inputs]: ... here.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2022-08-12 15:43:48 -0400'>2022-08-12</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=ff0600c5efb519925c270e9f54f43ecf096e564e'>gnu: tesseract-ocr: Make the default install minimally useful.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://issues.guix.gnu.org/47536&gt;.

* gnu/packages/ocr.scm (tesseract-ocr)
[phases]{adjust-TESSDATA_PREFIX-macro}: New phase.
{install-minimal-tessdata}: New phase.
[native-inputs]: Add tesseract-ocr-tessdata-fast.
[search-paths]: New field.
[description]: Mention how to add support for more languages.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-08-12 15:43:48 -0400'>2022-08-12</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=a6b6b0e89e6a3aefa0241de9f171424ad99be30c'>gnu: Add tesseract-ocr-tessdata-fast.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (tesseract-ocr-tessdata-fast): New variable.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-08-12 00:38:46 -0400'>2022-08-12</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=f7c027617da44ed684bbb9b35c603b790365fdbf'>gnu: tesseract-ocr: Update to 5.2.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (tesseract-ocr): Update to 5.2.0.
[inputs, native-inputs]: Move after arguments.  Use new style inputs.
[arguments]: Use gexps.
[configure-flags]: Add --disable-static.
[phases]{fix-docbook}: Replace phase with...
{do-not-override-xml-catalog-files}: ... this new phase.
{build-training}: Move after build phase.  Enable parallel build.
{trailing-install}: Move after install phase.
[native-inputs]: Add libxml2.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-08-12 00:38:46 -0400'>2022-08-12</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=887dbf4d802d1061e08eb47026f1adab2c43d791'>gnu: ocrad: Update to 0.28.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (ocrad): Update to 0.28.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-05-31 14:53:46 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/ocr.scm?id=2d51db54bd9abafd7777012e94e8f4c21dff8aa1'>gnu: Remove python2-zinnia.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ocr.scm (python2-zinnia): Delete variable.
</span></span></td><td>Maxim Cournoyer</td></tr>