From 0dd3ebd68d1999631848975aa48fa0d89a323065 Mon Sep 17 00:00:00 2001
From: Larry Knox <lrknox@hdfgroup.org>
Date: Wed, 15 Apr 2020 13:48:03 -0500
Subject: Add prefix_relto_examplesdir function to set relative path to h5c++.

---
 c++/examples/run-c++-ex.sh.in | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/c++/examples/run-c++-ex.sh.in b/c++/examples/run-c++-ex.sh.in
index 4667878..d05b120 100644
--- a/c++/examples/run-c++-ex.sh.in
+++ b/c++/examples/run-c++-ex.sh.in
@@ -30,6 +30,29 @@
 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
+# $() won't clobber it.
+#
+prefix_relto_examplesdir=$(
+prefix=@prefix@
+examplesdir=@examplesdir@
+if [ ${examplesdir##${prefix}/} != ${examplesdir} ]; then
+        echo $(echo ${examplesdir##${prefix}/} | \
+            sed 's,[^/][^/]*,..,g')
+else
+        echo $prefix
+fi
+)
+
 # Where the tool is installed.
 # default is relative path to installed location of the tools
 prefix="${prefix:-../${prefix_relto_examplesdir}}"
-- 
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