Made Tests Optional to Allow Older glib

Debian Stable had old Glib, only used for gtest, so made it optional.

Makefile.am

@@ -1,6 +1,7 @@
 include $(top_srcdir)/build/Makefile.am.lm
 
-SUBDIRS = loudmouth docs examples tests
+SUBDIRS = loudmouth docs examples $(TEST_DIRS)
+DIST_SUBDIRS = loudmouth docs examples tests
 
 EXTRA_DIST +=			\
 	loudmouth-1.0.pc.in     \

README

@@ -14,12 +14,15 @@ feedback I would be most grateful.
 Requirements:
 =============
 
-Glib >= 2.16.0:
+Glib >= 2.12.4:
 http://ftp.gnome.org/pub/GNOME/sources/glib/2.16/
 
 gtk-doc (optional, if you want documentation built):
 ftp://ftp.gnome.org/pub/GNOME/sources/gtk-doc/1.0
 
+If you want our unit tests through the g_test framework:
+Glib >= 2.16.0
+
 If you want SSL-support you'll also need:
 GnuTLS >= 1.2.0 with libtasn support.
 

configure.ac

@@ -79,7 +79,8 @@ changequote([,])dnl
 AC_SUBST(CFLAGS)
 AC_SUBST(LDFLAGS)
 
-GLIB2_REQUIRED=2.16.0
+GLIB2_REQUIRED=2.12.4
+GLIB2_TEST_REQUIRED=2.16.0
 GNUTLS_REQUIRED=1.4.0
 LIBTASN1_REQUIRED=0.2.6
 
@@ -93,6 +94,16 @@ PKG_CHECK_MODULES(LOUDMOUTH,
                   glib-2.0 >= $GLIB2_REQUIRED
                   gobject-2.0 >= $GLIB2_REQUIRED)
 
+PKG_CHECK_MODULES(LOUDMOUTHTEST,
+                  glib-2.0 >= $GLIB2_TEST_REQUIRED,
+		  enable_test=yes, enable_test=no)
+if test "$enable_test" = yes; then
+  TEST_DIRS=tests
+else
+  TEST_DIRS=
+fi
+AC_SUBST([TEST_DIRS])
+
 PKG_CHECK_MODULES(LIBIDN, libidn, have_idn=yes, have_idn=no)
 if test "x$have_idn" = "xyes"; then
 	AC_DEFINE(HAVE_IDN, 1, [Define if IDN support is included])
@@ -297,7 +308,8 @@ echo "
 	Linux TCP keepalives:     ${use_keepalives}
 	Enable Debug:             ${enable_debug}
 	Enable GSSAPI:            ${enable_gssapi}
-	Enable Documentation      ${enable_gtk_doc}
+	Enable Documentation:     ${enable_gtk_doc}
+	Enable Tests:             ${enable_test}
 
 	Now type 'make' to build Loudmouth
 "