diff --git a/chapter01/changelog.xml b/chapter01/changelog.xml
index 62cb7b463..b40c862ee 100644
--- a/chapter01/changelog.xml
+++ b/chapter01/changelog.xml
@@ -39,6 +39,10 @@
     <listitem>
       <para>2010-04-20</para>
       <itemizedlist>
+        <listitem>
+          <para>[matthew] Upgrade to Perl-5.12.0.  Fixes
+          <ulink url="&lfs-ticket-root;2635">#2635</ulink>.</para>
+        </listitem>
         <listitem>
           <para>[matthew] Upgrade to Kbd-1.15.2.  Fixes
           <ulink url="&lfs-ticket-root;2634">#2634</ulink>.</para>
diff --git a/chapter01/whatsnew.xml b/chapter01/whatsnew.xml
index e6f2af558..fd3aa51ac 100644
--- a/chapter01/whatsnew.xml
+++ b/chapter01/whatsnew.xml
@@ -148,9 +148,9 @@
     <!--<listitem>
       <para>Patch &patch-version;</para>
     </listitem>-->
-    <!--<listitem>
+    <listitem>
       <para>Perl &perl-version;</para>
-    </listitem>-->
+    </listitem>
     <!--<listitem>
       <para>Procps &procps-version;</para>
     </listitem>-->
@@ -222,6 +222,9 @@
     <listitem>
       <para>grep-2.5.4-debian_fixes-1.patch</para>
     </listitem>
+    <listitem>
+      <para>perl-5.10.1-utf8-1.patch</para>
+    </listitem>
     <listitem>
       <para>vim-7.2-fixes-5.patch</para>
     </listitem>
diff --git a/chapter03/patches.xml b/chapter03/patches.xml
index 1b17f5b24..6c28a6e75 100644
--- a/chapter03/patches.xml
+++ b/chapter03/patches.xml
@@ -147,21 +147,6 @@
       </listitem>
     </varlistentry>
 
-    <varlistentry>
-      <term>Perl UTF8 Patch - <token>&perl-utf8-patch-size;</token>:</term>
-      <listitem>
-        <para>Download: <ulink url="&patches-root;&perl-utf8-patch;"/></para>
-        <para>MD5 sum: <literal>&perl-utf8-patch-md5;</literal></para>
-      </listitem>
-    </varlistentry>
-    <!--
-    <varlistentry>
-      <term>Perl Security Patch - <token>&perl-security-patch-size;</token>:</term>
-      <listitem>
-        <para>Download: <ulink url="&patches-root;&perl-security-patch;"/></para>
-        <para>MD5 sum: <literal>&perl-security-patch-md5;</literal></para>
-      </listitem>
-    </varlistentry> -->
 
     <varlistentry>
       <term>Procps Watch Patch - <token>&procps-watch-patch-size;</token>:</term>
diff --git a/chapter05/perl.xml b/chapter05/perl.xml
index 32cb79b07..d18fbfaf9 100644
--- a/chapter05/perl.xml
+++ b/chapter05/perl.xml
@@ -54,11 +54,11 @@
 sed 's/command /command[ -]/' makedepend.SH.orig &gt; makedepend.SH</userinput></screen> -->
 
     <para>Prepare Perl for compilation (make sure to get the
-    'Data/Dumper Fcntl IO POSIX' part of the command correct&mdash;they are all
+    'Data/Dumper Fcntl IO' part of the command correct&mdash;they are all
     letters):</para>
 
 <screen><userinput remap="configure">sh Configure -des -Dprefix=/tools \
-                  -Dstatic_ext='Data/Dumper Fcntl IO POSIX'</userinput></screen>
+                  -Dstatic_ext='Data/Dumper Fcntl IO'</userinput></screen>
 
     <variablelist>
       <title>The meaning of the configure options:</title>
diff --git a/chapter06/perl.xml b/chapter06/perl.xml
index 1f7fceb19..7487ca6ae 100644
--- a/chapter06/perl.xml
+++ b/chapter06/perl.xml
@@ -47,11 +47,6 @@
 
 <screen><userinput remap="pre">echo "127.0.0.1 localhost $(hostname)" &gt; /etc/hosts</userinput></screen>
 
-    <para>Fix a problem where invalid utf-8 characters cause a segmentation 
-    fault:</para>
-
-<screen><userinput remap="pre">patch -Np1 -i ../&perl-utf8-patch;</userinput></screen>
-
     <para>This version of Perl now builds the Compress::Raw::Zlib module. By
     default Perl will use an internal copy of the Zlib source for the build.
     Issue the following command so that Perl will use the Zlib library
@@ -60,7 +55,7 @@
 <screen><userinput remap="pre">sed -i -e "s|BUILD_ZLIB\s*= True|BUILD_ZLIB = False|"           \
        -e "s|INCLUDE\s*= ./zlib-src|INCLUDE    = /usr/include|" \
        -e "s|LIB\s*= ./zlib-src|LIB        = /usr/lib|"         \
-    ext/Compress-Raw-Zlib/config.in</userinput></screen>
+    cpan/Compress-Raw-Zlib/config.in</userinput></screen>
 
     <para>To have full control over the way Perl is set up, you can remove the
     <quote>-des</quote> options from the following command and hand-pick the way
diff --git a/packages.ent b/packages.ent
index 559e7dce3..b14dec3ef 100644
--- a/packages.ent
+++ b/packages.ent
@@ -394,10 +394,10 @@
 <!ENTITY patch-ch6-du "1.9 MB">
 <!ENTITY patch-ch6-sbu "less than 0.1 SBU">
 
-<!ENTITY perl-version "5.10.1">
-<!ENTITY perl-size "11,336 KB">
+<!ENTITY perl-version "5.12.0">
+<!ENTITY perl-size "12,016 KB">
 <!ENTITY perl-url "http://cpan.org/src/5.0/perl-&perl-version;.tar.bz2">
-<!ENTITY perl-md5 "82400c6d34f7b7b43d0196c76cd2bbb1">
+<!ENTITY perl-md5 "3e15696f4160775a90f6b2fb3ccc98c2">
 <!ENTITY perl-home "http://cpan.org/">
 <!ENTITY perl-ch5-du "106 MB">
 <!ENTITY perl-ch5-sbu "0.8 SBU">
diff --git a/patches.ent b/patches.ent
index 278a847f3..2c312dc44 100644
--- a/patches.ent
+++ b/patches.ent
@@ -76,10 +76,6 @@
 <!ENTITY perl-libc-patch-md5 "800dfd3c9618731ee5cf57f77a7942b4">
 <!ENTITY perl-libc-patch-size "1 KB">
 
-<!ENTITY perl-utf8-patch "perl-&perl-version;-utf8-1.patch">
-<!ENTITY perl-utf8-patch-md5 "f0c8a66598708bd7def8e85eed82bb95">
-<!ENTITY perl-utf8-patch-size "8 KB">
-
 <!ENTITY procps-watch-patch "procps-&procps-version;-watch_unicode-1.patch">
 <!ENTITY procps-watch-patch-md5 "cd1a757e532d93662a7ed71da80e6b58">
 <!ENTITY procps-watch-patch-size "3.5 KB">