From 4ff67b044e16d29c1dcc51afc3561e413e7994a6 Mon Sep 17 00:00:00 2001
From: David Young <dyoung@hdfgroup.org>
Date: Tue, 5 Nov 2019 10:14:59 -0600
Subject: Make this script relocatable again: derive a relative path for the
 original installation prefix from the examples prefix.  Use that relative
 path to locate the current installation prefix, always.  Fall back to an
 absolute installation prefix if the relative path cannot be derived.

---
 examples/run-c-ex.sh.in | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/examples/run-c-ex.sh.in b/examples/run-c-ex.sh.in
index 3648706..238b665 100644
--- a/examples/run-c-ex.sh.in
+++ b/examples/run-c-ex.sh.in
@@ -28,10 +28,33 @@
 # Initializations
 EXIT_SUCCESS=0
 EXIT_FAILURE=1
- 
+
+#
+# Try to derive the path to the installation $prefix established
+# by ./configure relative to the examples directory established by
+# ./configure.  If successful, set `prefix_relto_examplesdir` to the
+# relative path.  Otherwise, set `prefix_relto_examplesdir` to the
+# absolute installation $prefix.
+#
+# This script uses the value of `prefix` in the user's environment, if
+# it is set, below.  The content of $() is evaluated in a sub-shell, so
+# if `prefix` is set in the user's environment, the shell statements in
+# $() won't clobbered it.
+#
+prefix_relto_examplesdir=$(
+prefix=@prefix@
+examplesdir=@examplesdir@
+if [ ${examplesdir##${prefix}/} != ${examplesdir} ]; then
+	echo $(echo ${examplesdir##${prefix}/} | \
+	    sed -E 's,[^/]+,..,g')
+else
+	echo $prefix
+fi
+)
+
 # Where the tool is installed.
 # default is relative path to installed location of the tools 
-prefix="${prefix:-@prefix@}"
+prefix="${prefix:-${prefix_relto_examplesdir}}"
 PARALLEL=@PARALLEL@             # Am I in parallel mode?
 AR="@AR@"
 RANLIB="@RANLIB@"
-- 
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