[gnome-common] Fix bashisms in gnome-autogen.sh, bug 588020

[David King <davidk src gnome org>]

commit 101362218645db3f0fbb55e1e6ea80c4bd70f97d
Author: Emilio Pozuelo Monfort <pochu27 gmail com>
Date:   Mon Jul 30 15:24:00 2012 +0100

    Fix bashisms in gnome-autogen.sh, bug 588020

 macros2/gnome-autogen.sh |   31 ++++++++++++++++---------------
 1 files changed, 16 insertions(+), 15 deletions(-)
---
diff --git a/macros2/gnome-autogen.sh b/macros2/gnome-autogen.sh
index 3179c3f..960046f 100644
--- a/macros2/gnome-autogen.sh
+++ b/macros2/gnome-autogen.sh
@@ -2,24 +2,24 @@
 # Run this to generate all the initial makefiles, etc.
 
 #name of package
-PKG_NAME=${PKG_NAME:-Package}
-srcdir=${srcdir:-.}
+test "$PKG_NAME" || PKG_NAME=Package
+test "$srcdir" || srcdir=.
 
 # default version requirements ...
-REQUIRED_AUTOCONF_VERSION=${REQUIRED_AUTOCONF_VERSION:-2.53}
-REQUIRED_AUTOMAKE_VERSION=${REQUIRED_AUTOMAKE_VERSION:-1.9}
-REQUIRED_LIBTOOL_VERSION=${REQUIRED_LIBTOOL_VERSION:-1.4.3}
-REQUIRED_GETTEXT_VERSION=${REQUIRED_GETTEXT_VERSION:-0.10.40}
-REQUIRED_GLIB_GETTEXT_VERSION=${REQUIRED_GLIB_GETTEXT_VERSION:-2.2.0}
-REQUIRED_INTLTOOL_VERSION=${REQUIRED_INTLTOOL_VERSION:-0.25}
-REQUIRED_PKG_CONFIG_VERSION=${REQUIRED_PKG_CONFIG_VERSION:-0.14.0}
-REQUIRED_GTK_DOC_VERSION=${REQUIRED_GTK_DOC_VERSION:-1.0}
-REQUIRED_DOC_COMMON_VERSION=${REQUIRED_DOC_COMMON_VERSION:-2.3.0}
-REQUIRED_GNOME_DOC_UTILS_VERSION=${REQUIRED_GNOME_DOC_UTILS_VERSION:-0.4.2}
+test "$REQUIRED_AUTOCONF_VERSION" || REQUIRED_AUTOCONF_VERSION=2.53
+test "$REQUIRED_AUTOMAKE_VERSION" || REQUIRED_AUTOMAKE_VERSION=1.9
+test "$REQUIRED_LIBTOOL_VERSION" || REQUIRED_LIBTOOL_VERSION=1.4.3
+test "$REQUIRED_GETTEXT_VERSION" || REQUIRED_GETTEXT_VERSION=0.10.40
+test "$REQUIRED_GLIB_GETTEXT_VERSION" || REQUIRED_GLIB_GETTEXT_VERSION=2.2.0
+test "$REQUIRED_INTLTOOL_VERSION" || REQUIRED_INTLTOOL_VERSION=0.25
+test "$REQUIRED_PKG_CONFIG_VERSION" || REQUIRED_PKG_CONFIG_VERSION=0.14.0
+test "$REQUIRED_GTK_DOC_VERSION" || REQUIRED_GTK_DOC_VERSION=1.0
+test "$REQUIRED_DOC_COMMON_VERSION" || REQUIRED_DOC_COMMON_VERSION=2.3.0
+test "$REQUIRED_GNOME_DOC_UTILS_VERSION" || REQUIRED_GNOME_DOC_UTILS_VERSION=0.4.2
 
 # a list of required m4 macros.  Package can set an initial value
-REQUIRED_M4MACROS=${REQUIRED_M4MACROS:-}
-FORBIDDEN_M4MACROS=${FORBIDDEN_M4MACROS:-}
+test "$REQUIRED_M4MACROS" || REQUIRED_M4MACROS=
+test "$FORBIDDEN_M4MACROS" || FORBIDDEN_M4MACROS=
 
 # Not all echo versions allow -n, so we check what is possible. This test is
 # based on the one in autoconf.
@@ -174,7 +174,8 @@ check_m4macros() {
     # but it contains only Automake's own macros, so we can ignore it.
 
     # Read the dirlist file, supported by Automake >= 1.7.
-    if compare_versions 1.7 $AUTOMAKE_VERSION && [ -s $cm_macrodirs/dirlist ]; then
+    # If AUTOMAKE was defined, no version was detected.
+    if [ -z "$AUTOMAKE_VERSION" ] || compare_versions 1.7 $AUTOMAKE_VERSION && [ -s $cm_macrodirs/dirlist ]; then
 	cm_dirlist=`sed 's/[ 	]*#.*//;/^$/d' $cm_macrodirs/dirlist`
 	if [ -n "$cm_dirlist" ] ; then
 	    for cm_dir in $cm_dirlist; do