Allow the location of the Phoenix library to be specified on the configure

commandline.

ext/msession/config.m4

@@ -1,15 +1,32 @@
 
 PHP_ARG_WITH(msession, for msession support,
-        [  --with-msession             Include msession support])
+[  --with-msession[=DIR]   Include msession support])
  
 if test "$PHP_MSESSION" != "no"; then
-	PHOENIX_HOME="/usr/local/phoenix"
-  	AC_DEFINE(HAVE_MSESSION, 1, [ ])
-  	PHP_EXTENSION(msession, $ext_shared)
-	PHOENIX_INCLUDE_="-I/usr/local/phoenix/lib"
-  	PHP_ADD_LIBRARY_WITH_PATH(phoenix, "/usr/local/phoenix/lib", PHOENIX_LIB)
+	if test -r $PHP_MSESSION/lib/libphoenix.a; then
+		PHOENIX_DIR=$PHP_MSESSION
+	else
+		AC_MSG_CHECKING(for msession in default path)
+		for i in /usr/local/phoenix /usr/local /usr; do
+			if test -r $i/lib/libphoenix.a; then
+				PHOENIX_DIR=$i
+				AC_MSG_RESULT(found in $i)
+			fi
+		done
+	fi
+
+	if test -z "$PHOENIX_DIR"; then
+		AC_MSG_RESULT(not found)
+		AC_MSG_ERROR(Please reinstall the Phoenix / msession distribution)
+	fi
+
 
+  	AC_DEFINE(HAVE_MSESSION, 1, [ ])
+  	PHP_ADD_LIBRARY_WITH_PATH(phoenix, "$PHOENIX_DIR/lib", PHOENIX_LIB)
+	PHOENIX_INCLUDE="-I$PHOENIX_DIR"
 	PHP_SUBST(PHOENIX_INCLUDE)
 	PHP_SUBST(PHOENIX_LIB)
+
+  	PHP_EXTENSION(msession, $ext_shared)
 fi