diff --git a/init.cfg b/init.cfg
new file mode 100644
index 0000000..06c54ad
--- /dev/null
+++ b/init.cfg
@@ -0,0 +1,68 @@
+# This file is sourced by init.sh, *before* its initialization.
+
+# Copyright (C) 2010-2018 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# Skip the current test if valgrind doesn't work,
+# which could happen if not installed,
+# or hasn't support for the built architecture,
+# or hasn't appropriate error suppressions installed etc.
+
+# This goes hand in hand with the "exec 9>&2;" in tests/Makefile.am's
+# TESTS_ENVIRONMENT definition.
+stderr_fileno_=9
+
+# Having an unsearchable directory in PATH causes execve to fail with EACCES
+# when applied to an unresolvable program name, contrary to the desired ENOENT.
+# Avoid the problem by rewriting PATH to exclude unsearchable directories.
+# Also, if PATH lacks /sbin and/or /usr/sbin, append it/them.
+sanitize_path_()
+{
+  # FIXME: remove double quotes around $IFS when all tests use init.sh.
+  # They constitute a work-around for a bug in FreeBSD 8.1's /bin/sh.
+  local saved_IFS="$IFS"
+    IFS=:
+    set -- $PATH
+  IFS=$saved_IFS
+
+  local d d1
+  local colon=
+  local new_path=
+  for d in "$@"; do
+    test -z "$d" && d1=. || d1=$d
+    if ls -d "$d1/." > /dev/null 2>&1; then
+      new_path="$new_path$colon$d"
+      colon=':'
+    fi
+  done
+
+  for d in /sbin /usr/sbin ; do
+    case ":$new_path:" in
+      *:$d:*) ;;
+      *) new_path="$new_path:$d" ;;
+    esac
+  done
+
+  PATH=$new_path
+  export PATH
+}
+
+require_valgrind_()
+{
+  valgrind --error-exitcode=1 true 2>/dev/null ||
+    skip_ "requires a working valgrind"
+}
+
+sanitize_path_
diff --git a/tests/Makefile.am b/tests/Makefile.am
index a1607cc..26646c0 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -80,7 +80,6 @@ TESTS_ENVIRONMENT =					\
   PREFERABLY_POSIX_SHELL='$(PREFERABLY_POSIX_SHELL)'	\
   REPLACE_GETCWD=$(REPLACE_GETCWD)			\
   PATH='$(abs_top_builddir)/src$(PATH_SEPARATOR)'"$$PATH"	\
-  stderr_fileno_=9					\
   ; 9>&2
 
 LOG_COMPILER= $(SHELL)
diff --git a/tests/init.cfg b/tests/init.cfg
new file mode 100644
index 0000000..06c54ad
--- /dev/null
+++ b/tests/init.cfg
@@ -0,0 +1,68 @@
+# This file is sourced by init.sh, *before* its initialization.
+
+# Copyright (C) 2010-2018 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# Skip the current test if valgrind doesn't work,
+# which could happen if not installed,
+# or hasn't support for the built architecture,
+# or hasn't appropriate error suppressions installed etc.
+
+# This goes hand in hand with the "exec 9>&2;" in tests/Makefile.am's
+# TESTS_ENVIRONMENT definition.
+stderr_fileno_=9
+
+# Having an unsearchable directory in PATH causes execve to fail with EACCES
+# when applied to an unresolvable program name, contrary to the desired ENOENT.
+# Avoid the problem by rewriting PATH to exclude unsearchable directories.
+# Also, if PATH lacks /sbin and/or /usr/sbin, append it/them.
+sanitize_path_()
+{
+  # FIXME: remove double quotes around $IFS when all tests use init.sh.
+  # They constitute a work-around for a bug in FreeBSD 8.1's /bin/sh.
+  local saved_IFS="$IFS"
+    IFS=:
+    set -- $PATH
+  IFS=$saved_IFS
+
+  local d d1
+  local colon=
+  local new_path=
+  for d in "$@"; do
+    test -z "$d" && d1=. || d1=$d
+    if ls -d "$d1/." > /dev/null 2>&1; then
+      new_path="$new_path$colon$d"
+      colon=':'
+    fi
+  done
+
+  for d in /sbin /usr/sbin ; do
+    case ":$new_path:" in
+      *:$d:*) ;;
+      *) new_path="$new_path:$d" ;;
+    esac
+  done
+
+  PATH=$new_path
+  export PATH
+}
+
+require_valgrind_()
+{
+  valgrind --error-exitcode=1 true 2>/dev/null ||
+    skip_ "requires a working valgrind"
+}
+
+sanitize_path_