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)" \
 ption value='koszko' selected='selected'>koszko</option>
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<div class='path'>path: <a href='/guix/log/?id=e0945a02a41afe31d99e3920aa9f7e2239df7bb7'>root</a>/<a href='/guix/log/tests?id=e0945a02a41afe31d99e3920aa9f7e2239df7bb7'>tests</a>/<a href='/guix/log/tests/ui.scm?id=e0945a02a41afe31d99e3920aa9f7e2239df7bb7'>ui.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/tests/ui.scm?id=e0945a02a41afe31d99e3920aa9f7e2239df7bb7&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-25 16:02:53 +0100'>2020-03-25</span></td><td><a href='/guix/commit/tests/ui.scm?id=c136da3fbd92a5db1f889d37f0a7c938ccd63648'>tests: Adjust to 'show-manifest-transaction' changes.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 3e5ab0a7a9399bb098b9ced46bf3cbf4085c6bab.

* tests/ui.scm ("show-manifest-transaction"): Update regexp.
* tests/guix-package.sh: Adjust Emacs regexp in --with-source test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-02-23 12:47:13 +0100'>2020-02-23</span></td><td><a href='/guix/commit/tests/ui.scm?id=fa99c4bbc7acdb8def9ce14a05aacb73f99fe3b1'>ui: (size-&gt;number "1.M") is correctly parsed.</a><span class='msg-avail'>...<span class='msg-tooltip'>Reported by Pierre Neidhardt &lt;mail@ambrevar.xyz&gt;.

* guix/ui.scm (size-&gt;number)[unit-pos]: Add #\. to CHAR-SET:DIGIT.
* tests/ui.scm ("size-&gt;number, 1.M"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-19 23:24:04 +0200'>2019-09-19</span></td><td><a href='/guix/commit/tests/ui.scm?id=d2cdef65605b9e14bfa02c3bf1612ab6b62f4a89'>ui: 'relevance' connects regexps with a logical and.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/36763&gt;.
Previously, the logical and connecting the regexps did not output the expected
results (introduced in 8874faaaac665100a095ef25e39c9a389f5a397f).

* guix/ui.scm (relevance)
[score]: Change its arguments.
[regexp-&gt;score]: New procedure.
* tests/ui.scm ("package-relevance"): Add test.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>zimoun</td></tr>
<tr><td><span title='2019-06-27 11:14:40 +0200'>2019-06-27</span></td><td><a href='/guix/commit/tests/ui.scm?id=8874faaaac665100a095ef25e39c9a389f5a397f'>ui: 'relevance' considers regexps connected with a logical and.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/ui.scm (relevance)[score]: Change to return 0 when one of REGEXPS
doesn't match.
* tests/ui.scm ("package-relevance"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-10 22:05:21 +0200'>2017-05-10</span></td><td><a href='/guix/commit/tests/ui.scm?id=30d2397f73d6fa9e77eed70ec6df8afd3b9f5f5e'>ui: 'string-&gt;duration' correctly handles hours.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/ui.scm (string-&gt;duration): Add missing '=&gt;' for hours.
* tests/ui.scm ("duration, 2 hours"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>