add abt-snoozer configure enable/disable switch

configure.ac

@@ -73,16 +73,34 @@ CPPFLAGS="$ARGOBOTS_CFLAGS $CPPFLAGS"
 CFLAGS="$ARGOBOTS_CFLAGS $CFLAGS"
 
 PC_REQUIRES="mercury argobots"
-PKG_CHECK_MODULES([ABT_SNOOZER],[abt-snoozer],
-	[
-            AC_DEFINE([HAVE_ABT_SNOOZER], [1], [Use ABT-SNOOZER])
-            PC_REQUIRES="$PC_REQUIRES abt-snoozer"
-        ],
-	[printf ""])
-LIBS="$ABT_SNOOZER_LIBS $LIBS"
-CPPFLAGS="$ABT_SNOOZER_CFLAGS $CPPFLAGS"
-CFLAGS="$ABT_SNOOZER_CFLAGS $CFLAGS"
-AC_SUBST([PC_REQUIRES], ["$PC_REQUIRES"])
+
+check_abt_snoozer=auto
+AC_ARG_ENABLE([abt-snoozer],
+    [  --enable-abt-snoozer    enable abt-snoozer (default: dynamic check)],
+    [ case "${enableval}" in
+     yes) check_abt_snoozer=yes ;;
+     no)  check_abt_snoozer=no ;;
+     *) AC_MSG_ERROR([bad value ${enableval} for --enable-abt-snoozer]) ;;
+     esac],
+    [])
+
+check_abt_snoozer_status=fail
+if test "x${check_abt_snoozer}" = xauto -o "x${check_abt_snoozer}" = xyes ; then
+    dnl AC_MSG_CHECKING([If abt-snoozer is installed])
+    PKG_CHECK_MODULES([ABT_SNOOZER],[abt-snoozer],
+        [AC_DEFINE([HAVE_ABT_SNOOZER], [1], [Use ABT-SNOOZER])
+         PC_REQUIRES="$PC_REQUIRES abt-snoozer"
+         LIBS="$ABT_SNOOZER_LIBS $LIBS"
+         CPPFLAGS="$ABT_SNOOZER_CFLAGS $CPPFLAGS"
+         CFLAGS="$ABT_SNOOZER_CFLAGS $CFLAGS"
+         AC_SUBST([PC_REQUIRES], ["$PC_REQUIRES"])
+         check_abt_snoozer_status=success],
+        [printf ""])
+fi
+
+if test "x${check_abt_snoozer_status}" = xfail -a "x${check_abt_snoozer}" = xyes; then
+    AC_MSG_ERROR([Could not find working abt-snoozer installation!])
+fi
 
 # turn off a warning that is tripping up our use of utlist at the moment
 CFLAGS="-Wno-address $CFLAGS"