+
+# For all platforms: Use Gtk+3.0 if available; else revert to Gtk+2.0
+PKG_CHECK_MODULES([GTK],
+ [gtk+-3.0 >= 3.1],
+ [GTK_VERSION="gtk+-3.0"],
+ [PKG_CHECK_MODULES([GTK],
+ [gtk+-2.0 >= 2.18],
+ [GTK_VERSION="gtk+-2.0"]
+ )]
+)
+AC_SUBST(GTK_VERSION)
+
+
+# For all platforms: If Log4Vala is enabled, then Use Log4Vala 0.2 if available; else revert to 0.1
+if [test x$log4vala = xtrue]; then
+PKG_CHECK_MODULES([LOG4VALA],
+ [log4vala-0.2],
+ [LOG4VALA_VERSION="log4vala-0.2"],
+ [PKG_CHECK_MODULES([LOG4VALA],
+ [log4vala-0.1],
+ [LOG4VALA_VERSION="log4vala-0.1"]
+ )]
+)
+AC_SUBST(LOG4VALA_VERSION)
+fi
+
+
+# For all platforms: Use gee-0.8 if available; else revert to gee-1.0
+# (yes, gee-0.8 is an upgrade from gee-1.0!)
+PKG_CHECK_MODULES([LIB_GEE],
+ [gee-0.8 >= 0.10.5],
+ [GEE_VERSION="gee-0.8"],
+ [PKG_CHECK_MODULES([LIB_GEE],
+ [gee-1.0 >= 0.5],
+ [GEE_VERSION="gee-1.0"]
+ )]
+)
+AC_SUBST(GEE_VERSION)
+
+#enable the optional use of Log4Vala (Must have the package installed!)
+AC_ARG_ENABLE([log4vala],
+[ --enable-log4vala Enable use of log4vala for logging],
+[case "${enableval}" in
+ yes) log4vala=true ;;
+ no) log4vala=false ;;
+ *) AC_MSG_ERROR([bad value ${enableval} for --enable-log4vala]) ;;
+esac],[log4vala=false])
+AM_CONDITIONAL([LOG4VALA], [test x$log4vala = xtrue])
+
+
+AM_CONDITIONAL([OS_LINUX], [test "$linux" = "yes"])