Install everything in PREFIX, set EXTRA_PATH to find it there.

--- ./Makefile.in~	2016-02-06 01:29:16.595090365 +0100
+++ ./Makefile.in	2016-02-06 09:29:04.286008931 +0100
@@ -133,9 +133,9 @@
 # require for testing here (like TCLX_LIBRARY).
 #========================================================================

-EXTRA_PATH	= $(top_builddir):$(TCL_BIN_DIR)
+EXTRA_PATH	= $(top_builddir):$(TCL_BIN_DIR):$(libdir)
 #EXTRA_PATH     = $(top_builddir):$(TCL_BIN_DIR):$(TK_BIN_DIR)
-TCLLIBPATH      = $(top_builddir)
+TCLLIBPATH      = $(pkglibdir)
 TCLSH_ENV	= TCL_LIBRARY=`@CYGPATH@ $(TCL_SRC_DIR)/library` \
 		  @LD_LIBRARY_PATH_VAR@="$(EXTRA_PATH):$(@LD_LIBRARY_PATH_VAR@)" \
 		  PATH="$(EXTRA_PATH):$(PATH)" \
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<div class='path'>path: <a href='/guix/log/?id=2dfb16150e11f273fd6f991bb563bf02a8a69402'>root</a>/<a href='/guix/log/gnu?id=2dfb16150e11f273fd6f991bb563bf02a8a69402'>gnu</a>/<a href='/guix/log/gnu/packages?id=2dfb16150e11f273fd6f991bb563bf02a8a69402'>packages</a>/<a href='/guix/log/gnu/packages/pretty-print.scm?id=2dfb16150e11f273fd6f991bb563bf02a8a69402'>pretty-print.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/pretty-print.scm?id=2dfb16150e11f273fd6f991bb563bf02a8a69402&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-15 00:38:32 +0100'>2020-11-15</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=cd551413eef6fbf54eff20792661e9fc279bdd7f'>gnu: highlight: Update to 3.59.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (highlight): Update to 3.59.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-11 21:37:12 +0100'>2020-11-11</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=5b48d6de23fb3936750df7571d3067b28a8ee6d1'>gnu: a2ps: Remove unused input.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (a2ps)[inputs]: Remove IMAGEMAGICK.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-10-09 23:59:14 +0200'>2020-10-09</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=2f4b51ab22b312b11656f70e2dd08290592358d3'>gnu: source-highlight: Allow cross-compilation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (source-highlight)[arguments]: Add
'skip-doc-directory' when (%current-target-system) is true.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-15 12:02:28 +0300'>2020-09-15</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=a8360892d734b6c7418dd600b838faf2b2eda30c'>gnu: waybar: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>Reported by bdju.

* gnu/packages/pretty-print.scm (fmt-6): New variable.
* gnu/packages/wm.scm (waybar)[inputs]: Replace fmt with fmt-6.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-09-13 23:34:23 +0200'>2020-09-13</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=0f918908ebcfc1d5aeb780d6fbe5c52a48178e85'>gnu: fmt: Update to 7.0.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>From 820d39a55a5673fffac70c919b8cc3b28d94f6e7 Mon Sep 17 00:00:00 2001
From: Greg Hogan &lt;code@greghogan.com&gt;
Date: Fri, 11 Sep 2020 10:53:20 +0000
Subject: [PATCH] gnu: fmt: Update to 7.0.3.

* gnu/packages/pretty-print.scm (fmt): Update to 7.0.3.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Greg Hogan</td></tr>
<tr><td><span title='2020-09-11 16:28:02 +0200'>2020-09-11</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=6bdc3b429af1d1be7120c594c0ed4826acde9c3d'>gnu: highlight: Update to 3.58.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (highlight): Update to 3.58.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-30 21:13:51 +0300'>2020-06-30</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=13bd54b15da134012d40822c867bc70aa0bb14af'>gnu: Sort package modules alphabetically in (gnu packages pretty-print).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm: Sort package module imports
alphabetically.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-06-03 06:51:45 +0200'>2020-06-03</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=523ddf348c6c24e1dddc86be0e136e7014fed7d0'>gnu: fmt: Update to 6.2.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (fmt): Update to 6.2.1.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-04-04 12:45:36 +0200'>2020-04-04</span></td><td><a href='/guix/commit/gnu/packages/pretty-print.scm?id=6e834bdd9fc201fa6da2ee2d5b1ae77088eec90a'>gnu: a2ps: Make some inputs native.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (a2ps)[inputs]: Move groff from here...
[native-inputs]: ...to here.

Signed-off-by: Mathieu Othacehe &lt;m.othacehe@gmail.com&gt;
</span></span></td><td>Vincent Legoll</td></tr>