diff --git a/autogen.sh b/autogen.sh
index 973fb98..2491cb9 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -21,8 +21,8 @@ EOF
   exit 1
 }
 
-test -n "$srcdir" || srcdir=$(dirname "$0")
-test -n "$srcdir" || srcdir=.
+: ${srcdir:="$(dirname "$0")"}
+: ${srcdir=.}
 
 olddir=$(pwd)
 
@@ -36,23 +36,23 @@ cd $srcdir
 # shellcheck disable=SC2016
 PKG_NAME=$(autoconf --trace 'AC_INIT:$1' configure.ac)
 
-if [ "$#" = 0 -a "x$NOCONFIGURE" = "x" ]; then
+case "$# $NOCONFIGURE" in ('0 ')
         echo "*** WARNING: I am going to run 'configure' with no arguments." >&2
         echo "*** If you wish to pass any to it, please specify them on the" >&2
         echo "*** '$0' command line." >&2
         echo "" >&2
-fi
+;;esac
 
 aclocal --install || exit 1
 autoreconf --verbose --force --install || exit 1
 
 cd "$olddir"
-if [ "$NOCONFIGURE" = "" ]; then
+case "$NOCONFIGURE" in ('')
         $srcdir/configure "$@" || exit 1
 
-        if [ "$1" = "--help" ]; then exit 0 else
+        case "$1" in ("--help") exit 0 ;;(*)
                 echo "Now type 'make' to compile $PKG_NAME" || exit 1
-        fi
-else
+        ;;esac
+;;(*)
         echo "Skipping configure process."
-fi
+;;esac