diff --git a/common/wscript b/common/wscript
index 36da386e..3741a98e 100644
--- a/common/wscript
+++ b/common/wscript
@@ -59,6 +59,7 @@ def build(bld):
         'JackServerGlobals.cpp',
         'JackControl.cpp',
         ]
+    serverlib.vnum = bld.env()['JACK_API_VERSION']
 
     clientlib = bld.create_obj('cpp', 'shlib')
     clientlib.features.append('cc')
@@ -76,5 +77,6 @@ def build(bld):
         'JackSocketClientChannel.cpp',
         'JackServerLaunch.cpp', 
         ]
+    clientlib.vnum = bld.env()['JACK_API_VERSION']
 
     install_files('PREFIX', 'jack', 'jack/*.h')
diff --git a/wscript b/wscript
index 5496b513..0dea7475 100644
--- a/wscript
+++ b/wscript
@@ -9,6 +9,7 @@ from Configure import g_maxlen
 
 VERSION='1.9.0'
 APPNAME='jack'
+JACK_API_VERSION = '0.1.0'
 
 # these variables are mandatory ('/' are converted automatically)
 srcdir = '.'
@@ -55,6 +56,7 @@ def configure(conf):
     conf.env['LIB_PTHREAD'] = ['pthread']
     conf.env['LIB_DL'] = ['dl']
     conf.env['LIB_RT'] = ['rt']
+    conf.env['JACK_API_VERSION'] = JACK_API_VERSION
 
     conf.define('ADDON_DIR', conf.env['PREFIX'] + '/lib/jack')
     conf.define('JACK_LOCATION', conf.env['PREFIX'] + '/bin')