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
 
d class='logo' rowspan='2'><a href='/'><img src='https://git.koszko.org/cgit-static/cgit.png' alt='cgit logo'/></a></td>
<td class='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='c4d769d359c67680fe55c3b71e659cd31837f3ec'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>refs</a><a class='active' href='/guix/log/gnu/packages/patches/glibc-CVE-2015-5180.patch'>log</a><a href='/guix/tree/gnu/packages/patches/glibc-CVE-2015-5180.patch?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>tree</a><a href='/guix/commit/gnu/packages/patches/glibc-CVE-2015-5180.patch?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>commit</a><a href='/guix/diff/gnu/packages/patches/glibc-CVE-2015-5180.patch?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/glibc-CVE-2015-5180.patch'>
<input type='hidden' name='id' value='c4d769d359c67680fe55c3b71e659cd31837f3ec'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>root</a>/<a href='/guix/log/gnu?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>gnu</a>/<a href='/guix/log/gnu/packages?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>patches</a>/<a href='/guix/log/gnu/packages/patches/glibc-CVE-2015-5180.patch?id=c4d769d359c67680fe55c3b71e659cd31837f3ec'>glibc-CVE-2015-5180.patch</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/patches/glibc-CVE-2015-5180.patch?id=c4d769d359c67680fe55c3b71e659cd31837f3ec&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-08-02 21:51:31 +0300'>2017-08-02</span></td><td><a href='/guix/commit/gnu/packages/patches/glibc-CVE-2015-5180.patch?id=575e5e4e51e01aed1044cd8ba9e00a9631eba794'>gnu: glibc@2.24: Fix CVE-2015-5180.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/base.scm (glibc@2.24)[source]: Add patch.
* gnu/packages/patches/glibc-CVE-2015-5180.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
</span></span></td><td>Efraim Flashner</td></tr>