diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index 8f488dd5df..988b88592c 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -241,12 +241,12 @@ lib/X11/oneko/mouse.xpm
 	    <filename>oneko</filename> port by adding the
 	    following lines to the <filename>Makefile</filename>:</para>
 
-	  <programlisting>PLIST_FILES=	bin/oneko \
-		lib/X11/app-defaults/Oneko \
-		lib/X11/oneko/cat1.xpm \
-		lib/X11/oneko/cat2.xpm \
-		lib/X11/oneko/mouse.xpm
-PLIST_DIRS=	lib/X11/oneko</programlisting>
+	  <programlisting>PLIST_FILES=    bin/oneko \
+                lib/X11/app-defaults/Oneko \
+                lib/X11/oneko/cat1.xpm \
+                lib/X11/oneko/cat2.xpm \
+                lib/X11/oneko/mouse.xpm
+PLIST_DIRS=     lib/X11/oneko</programlisting>
 
 	  <para>Of course, <makevar>PLIST_DIRS</makevar> should be left
 	    unset if a port installs no directories of its own.</para>
@@ -937,8 +937,8 @@ PLIST_DIRS=	lib/X11/oneko</programlisting>
 	    <literal>0.10</literal>, is committed to the ports
 	    collection:</para>
 
-	  <programlisting>PORTNAME=	gtkmumble
-PORTVERSION=	0.10</programlisting>
+	  <programlisting>PORTNAME=       gtkmumble
+PORTVERSION=    0.10</programlisting>
 
 	  <para><makevar>PKGNAME</makevar> becomes
 	    <literal>gtkmumble-0.10</literal>.</para>
@@ -947,9 +947,9 @@ PORTVERSION=	0.10</programlisting>
 	    FreeBSD patch. <makevar>PORTREVISION</makevar> is bumped
 	    accordingly.</para>
 
-	  <programlisting>PORTNAME=	gtkmumble
-PORTVERSION=	0.10
-PORTREVISION=	1</programlisting>
+	  <programlisting>PORTNAME=       gtkmumble
+PORTVERSION=    0.10
+PORTREVISION=   1</programlisting>
 
 	  <para><makevar>PKGNAME</makevar> becomes
 	    <literal>gtkmumble-0.10_1</literal></para>
@@ -967,9 +967,9 @@ PORTREVISION=	1</programlisting>
 	    <makevar>PORTREVISION</makevar> is reset to 0 (or removed
 	    from the <filename>Makefile</filename>).</para>
 
-	  <programlisting>PORTNAME=	gtkmumble
-PORTVERSION=	0.2
-PORTEPOCH=	1</programlisting>
+	  <programlisting>PORTNAME=       gtkmumble
+PORTVERSION=    0.2
+PORTEPOCH=      1</programlisting>
 
 	  <para><makevar>PKGNAME</makevar> becomes
 	    <literal>gtkmumble-0.2,1</literal></para>
@@ -978,9 +978,9 @@ PORTEPOCH=	1</programlisting>
 	    <makevar>PORTEPOCH</makevar> never decreases, the version
 	    variables are now:</para>
 
-	  <programlisting>PORTNAME=	gtkmumble
-PORTVERSION=	0.3
-PORTEPOCH=	1</programlisting>
+	  <programlisting>PORTNAME=       gtkmumble
+PORTVERSION=    0.3
+PORTEPOCH=      1</programlisting>
 
 	  <para><makevar>PKGNAME</makevar> becomes
 	    <literal>gtkmumble-0.3,1</literal></para>
@@ -4374,7 +4374,7 @@ LDCONFIG_DIRS=  %%PREFIX%%/lib/foo %%PREFIX%%/lib/bar</programlisting>
 	<filename role="package">audio/sdl_mixer</filename>,
 	the syntax will be:</para>
 
-      <programlisting>USE_SDL=	  net mixer</programlisting>
+      <programlisting>USE_SDL=        net mixer</programlisting>
 
       <para>The dependency <filename role="package">devel/sdl12</filename>,
 	which is required by <filename role="package">net/sdl_net</filename> and
@@ -6879,7 +6879,7 @@ post-install:
 	  looks as follows:</para>
 
         <programlisting>.if !defined(NOPORTDOCS)
-	PORTDOCS=	*
+        PORTDOCS=       *
 .endif</programlisting>
 
 	<note>