Added double quotes

Added double quotes to prevent globbing and word splitting.

autogen.sh

@@ -5,9 +5,9 @@
 
 export LC_ALL=C
 set -e
-srcdir="$(dirname $0)"
+srcdir="$(dirname "$0")"
 cd "$srcdir"
-if [ -z ${LIBTOOLIZE} ] && GLIBTOOLIZE="$(command -v glibtoolize)"; then
+if [ -z "${LIBTOOLIZE}" ] && GLIBTOOLIZE="$(command -v glibtoolize)"; then
   LIBTOOLIZE="${GLIBTOOLIZE}"
   export LIBTOOLIZE
 fi