Fixed quoting in INSTALL check.

configure

diff --git a/configure b/configure
index bdf2258..eaa5f65 100755
--- a/configure
+++ b/configure
@@ -4753,7 +4753,7 @@
 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
 
 case "$INSTALL" in
-  \\/$* | ?:\\/* ) ;;
+  [\\/$]* | ?:[\\/]* ) ;;
   *)  INSTALL="\\\$(TOPSRCDIR)/$INSTALL" ;;
 esac
 

configure.ac

diff --git a/configure.ac b/configure.ac
index 5745914..eb91bc3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,7 +90,7 @@
 AC_PROG_INSTALL
 dnl Prepend src dir to install path dir if it's a relative path
 case "$INSTALL" in
-  [\\/$]* | ?:[\\/]* ) ;;
+  [[\\/$]]* | ?:[[\\/]]* ) ;;
   *)  INSTALL="\\\$(TOPSRCDIR)/$INSTALL" ;;
 esac