Reported as <https://github.com/sgimenez/laby/pull/68>

diff --git a/build b/build
index 992a9e3..0df74d9 100755
--- a/build
+++ b/build
@@ -7,7 +7,6 @@ source build.conf || exit 1
 
 export PREFIX=${PREFIX-/usr}
 export DATADIR=${DATADIR-${PREFIX}/share}
-export TMPDIR=${TMPDIR-/tmp}
 
 export PROJECT_NAME=${PROJECT_NAME-unknown}
 export PROJECT_VERSION=${PROJECT_VERSION-unknown}
diff --git a/src/config.sh b/src/config.sh
index 19d4160..9338aad 100644
--- a/src/config.sh
+++ b/src/config.sh
@@ -29,5 +29,4 @@ let build_ocaml = "${OCAML_VERSION}"
 let build_lablgtk = "${BUILD_LABLGTK}"
 let build_lablgtk_sourceview = "${BUILD_LABLGTKSV}"
 let _ = Res.sys_data_dir := "${DATADIR}"
-let _ = Res.sys_tmp_dir := "${TMPDIR}"
 EOF
diff --git a/src/laby.ml b/src/laby.ml
index b77f2b2..e17acb9 100644
--- a/src/laby.ml
+++ b/src/laby.ml
@@ -48,6 +48,7 @@ let opts =
 
 let _ =
   Printexc.record_backtrace true;
+  Res.sys_tmp_dir := Filename.get_temp_dir_name ();
   Run.init
     ~name:Config.project_name
     ~conf:(conf, ["conf"])
-- 
2.34.1

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<div class='path'>path: <a href='/guix/log/?id=db2bfcb90d83324f33cfa6c224bfe504decf9056'>root</a>/<a href='/guix/log/tests?id=db2bfcb90d83324f33cfa6c224bfe504decf9056'>tests</a>/<a href='/guix/log/tests/graph.scm?id=db2bfcb90d83324f33cfa6c224bfe504decf9056'>graph.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/graph.scm?id=db2bfcb90d83324f33cfa6c224bfe504decf9056&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-10-20 16:30:15 +0200'>2020-10-20</span></td><td><a href='/guix/commit/tests/graph.scm?id=a9fd59dbd2d32e08c9479ac026b99b5c1dbbb0db'>graph: Adjust test for recent OCaml changes.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-22 01:29:39 +0200'>2020-05-22</span></td><td><a href='/guix/commit/tests/graph.scm?id=ce0be5675b702b2ff89aed1772ebb42af4150243'>packages: Introduce &lt;content-hash&gt; and use it in &lt;origin&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-11 23:30:55 +0200'>2020-05-11</span></td><td><a href='/guix/commit/tests/graph.scm?id=36c2192414dfcc43db767106cede2cc1d0e6e556'>graph: Add 'shortest-path'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-11 23:30:55 +0200'>2020-05-11</span></td><td><a href='/guix/commit/tests/graph.scm?id=724020213664239ec5c92d04f5fee44c25408a7f'>graph: reference/referrer node types work with graph traversal.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>