diff --git a/src/SConscript b/src/SConscript
index cd42c27..7cd7116 100755
--- a/src/SConscript
+++ b/src/SConscript
@@ -30,6 +30,7 @@
 
 import array
 import bisect
+import functools
 import imp
 import marshal
 import os
@@ -62,32 +63,68 @@
 # When specifying a source file of some type, a set of tags can be
 # specified for that file.
 
+class SourceFilter(object):
+    def __init__(self, predicate):
+        self.predicate = predicate
+
+    def __or__(self, other):
+        return SourceFilter(lambda tags: self.predicate(tags) or
+                                         other.predicate(tags))
+
+    def __and__(self, other):
+        return SourceFilter(lambda tags: self.predicate(tags) and
+                                         other.predicate(tags))
+
+def with_tags_that(predicate):
+    '''Return a list of sources with tags that satisfy a predicate.'''
+    return SourceFilter(predicate)
+
+def with_any_tags(*tags):
+    '''Return a list of sources with any of the supplied tags.'''
+    return SourceFilter(lambda stags: len(set(tags) & stags) > 0)
+
+def with_all_tags(*tags):
+    '''Return a list of sources with all of the supplied tags.'''
+    return SourceFilter(lambda stags: set(tags) <= stags)
+
+def with_tag(tag):
+    '''Return a list of sources with the supplied tag.'''
+    return SourceFilter(lambda stags: tag in stags)
+
+def without_tags(*tags):
+    '''Return a list of sources without any of the supplied tags.'''
+    return SourceFilter(lambda stags: len(set(tags) & stags) == 0)
+
+def without_tag(tag):
+    '''Return a list of sources with the supplied tag.'''
+    return SourceFilter(lambda stags: tag not in stags)
+
+source_filter_factories = {
+    'with_tags_that': with_tags_that,
+    'with_any_tags': with_any_tags,
+    'with_all_tags': with_all_tags,
+    'with_tag': with_tag,
+    'without_tags': without_tags,
+    'without_tag': without_tag,
+}
+
+Export(source_filter_factories)
+
 class SourceList(list):
-    def with_tags_that(self, predicate):
-        '''Return a list of sources with tags that satisfy a predicate.'''
+    def apply_filter(self, f):
         def match(source):
-            return predicate(source.tags)
+            return f.predicate(source.tags)
         return SourceList(filter(match, self))
 
-    def with_any_tags(self, *tags):
-        '''Return a list of sources with any of the supplied tags.'''
-        return self.with_tags_that(lambda stags: len(set(tags) & stags) > 0)
+    def __getattr__(self, name):
+        func = source_filter_factories.get(name, None)
+        if not func:
+            raise AttributeError
 
-    def with_all_tags(self, *tags):
-        '''Return a list of sources with all of the supplied tags.'''
-        return self.with_tags_that(lambda stags: set(tags) <= stags)
-
-    def with_tag(self, tag):
-        '''Return a list of sources with the supplied tag.'''
-        return self.with_tags_that(lambda stags: tag in stags)
-
-    def without_tags(self, *tags):
-        '''Return a list of sources without any of the supplied tags.'''
-        return self.with_tags_that(lambda stags: len(set(tags) & stags) == 0)
-
-    def without_tag(self, tag):
-        '''Return a list of sources with the supplied tag.'''
-        return self.with_tags_that(lambda stags: tag not in stags)
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            return self.apply_filter(func(*args, **kwargs))
+        return wrapper
 
 class SourceMeta(type):
     '''Meta class for source files that keeps track of all files of a
@@ -294,11 +331,14 @@
 
 class GTest(UnitTest):
     '''Create a unit test based on the google test framework.'''
-
     all = []
     def __init__(self, *args, **kwargs):
+        isFilter = lambda arg: isinstance(arg, SourceFilter)
+        self.filters = filter(isFilter, args)
+        args = filter(lambda a: not isFilter(a), args)
         super(GTest, self).__init__(*args, **kwargs)
         self.dir = Dir('.')
+        self.skip_lib = kwargs.pop('skip_lib', False)
 
 # Children should have access
 Export('Source')
@@ -1049,9 +1089,14 @@
     gtest_env = new_env.Clone()
     gtest_env.Append(LIBS=gtest_env['GTEST_LIBS'])
     gtest_env.Append(CPPFLAGS=gtest_env['GTEST_CPPFLAGS'])
+    gtestlib_sources = Source.all.with_tag('gtest lib')
     gtests = []
     for test in GTest.all:
-        test_sources = Source.all.with_tag(str(test.target))
+        test_sources = test.sources
+        if not test.skip_lib:
+            test_sources += gtestlib_sources
+        for f in test.filters:
+            test_sources += Source.all.apply_filter(f)
         test_objs = [ s.static(gtest_env) for s in test_sources ]
         gtests.append(gtest_env.Program(
             test.dir.File('%s.%s' % (test.target, label)), test_objs))