diff --git a/SConstruct b/SConstruct
index 4f4d44c..48b0d84 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1,11 +1,12 @@
 # SConstruct
 # vim: set ft=python:
-#
-# Toplevel Scons build script. This should be mostly complete and generic enough
-# for most builds.
-#
 # Eryn Wells <eryn@erynwells.me>
 
+'''
+Toplevel Scons build script. This should be mostly complete and generic enough
+for most builds.
+'''
+
 import logging
 
 setup_logging()
diff --git a/site_scons/paths.py b/site_scons/paths.py
deleted file mode 100644
index c2b37b9..0000000
--- a/site_scons/paths.py
+++ /dev/null
@@ -1,30 +0,0 @@
-# paths.py
-# Eryn Wells <eryn@erynwells.me>
-
-import os
-import os.path
-
-
-def is_executable(path):
-    return os.path.exists(path) and os.access(path, os.X_OK)
-
-
-def which(program):
-    '''
-    Look for `program` in system path and return the full path to that binary if
-    it is found. Otherwise, return `None`.
-    '''
-    path, name = os.path.split(program)
-    if path:
-        if is_executable(program):
-            return program
-    else:
-        pathext = [''] + os.environ.get('PATHEXT', '').split(os.pathsep)
-        for path in os.environ.get('PATH', '').split(os.pathsep):
-            exe = os.path.join(path, program)
-            for ext in pathext:
-                candidate = exe + ext
-                if is_executable(candidate):
-                    return candidate
-    return None
-
diff --git a/site_scons/site_init.py b/site_scons/site_init.py
index cb25ecf..0c2f2ba 100644
--- a/site_scons/site_init.py
+++ b/site_scons/site_init.py
@@ -3,12 +3,9 @@
 
 import logging
 import sys
-
 import SCons.Environment
 import SCons.Errors
 
-import paths
-
 
 def setup_logging(level=logging.DEBUG):
     '''Configure global logging for the SCons system.'''
@@ -105,6 +102,9 @@ class Environment(SCons.Environment.Environment):
         if colorful and sys.stdout.isatty():
             if 'clang' in self['CC'] or 'clang' in self['CXX']:
                 self.AppendUnique(CCFLAGS=['-fcolor-diagnostics'])
+            elif 'gcc' in self['CC'] or 'g++' in self['CXX']:
+                # TODO: Also set a GCC_COLORS variable in the system environment?
+                self.AppendUnique(CCFLAGS=['-fdiagnostics-color=always'])
 
         # Pretty printing
         self.SetDefault(ARCOMSTR=Environment._comstr('Archiving', succinct))
@@ -135,8 +135,6 @@ class Environment(SCons.Environment.Environment):
 
     def process_src(self):
         out_dir = self.build_root.Dir('src')
-        # TODO: Do the thing.
-        # do_sconscript(env, env.source_root, src_out_dir)
         self.SConscript(self.src_root.File('SConscript'),
                         variant_dir=out_dir)
         self.Append(CPPPATH=[self.src_root])
@@ -184,7 +182,7 @@ class Environment(SCons.Environment.Environment):
     def _append_custom_tools(self, kwargs):
         '''Add custom tools to the `kwargs`.'''
         tools = kwargs.setdefault('tools', ['default'])
-        for tool in ['lib', 'test', 'program', 'sconscript']:
+        for tool in ['lib', 'test', 'program', 'sconscript', 'swiftc']:
             if tool in tools:
                 continue
             tools.append(tool)
diff --git a/site_scons/site_tools/sconscript.py b/site_scons/site_tools/sconscript.py
index b898481..3e9b597 100644
--- a/site_scons/site_tools/sconscript.py
+++ b/site_scons/site_tools/sconscript.py
@@ -9,18 +9,20 @@ import SCons.Script
 
 def _do_sconscript(env):
     original_sconscript = env.SConscript
-    
+
     def sconscript(env, sconscript, clone=False, *args, **kwargs):
-        exports = {'Library': env.Library,
-                   'StaticLibrary': env.StaticLibrary,
-                   'SharedLibrary': env.SharedLibrary,
-                   'Program': env.Program}
+        exports = {
+            'Library': env.Library,
+            'Object': env.Object,
+            'SharedObject': env.SharedObject,
+            'StaticLibrary': env.StaticLibrary,
+            'SharedLibrary': env.SharedLibrary,
+            'Program': env.Program,
+            'env': env.Clone() if clone else env,
+        }
         SCons.Script._SConscript.GlobalDict.update(exports)
         env.log('Reading {}'.format(sconscript))
-        return original_sconscript(sconscript,
-                                   {'env': env.Clone() if clone else env},
-                                   *args,
-                                   **kwargs)
+        return original_sconscript(sconscript, {}, *args, **kwargs)
 
     return sconscript
 
diff --git a/site_scons/site_tools/swiftc.py b/site_scons/site_tools/swiftc.py
new file mode 100644
index 0000000..5d2766d
--- /dev/null
+++ b/site_scons/site_tools/swiftc.py
@@ -0,0 +1,33 @@
+# swiftc.py
+# vim: set ft=python:
+# Eryn Wells <eryn@erynwells.me>
+
+'''
+SCons plugin for building Swift files with swiftc.
+'''
+
+import SCons.Action
+import SCons.Tool
+import SCons.Util
+
+SwiftSuffix = '.swift'
+SwiftAction = SCons.Action.Action("$SWIFTCCOM", "$SWIFTCCOMSTR")
+
+compilers = ['swiftc']
+
+def generate(env):
+    static_obj, shared_obj = SCons.Tool.createObjBuilders(env)
+    static_obj.add_action(SwiftSuffix, SwiftAction)
+    static_obj.add_emitter(SwiftSuffix, SCons.Defaults.SharedObjectEmitter)
+    shared_obj.add_action(SwiftSuffix, SwiftAction)
+    shared_obj.add_emitter(SwiftSuffix, SCons.Defaults.SharedObjectEmitter)
+
+    if 'SWIFTC' not in env:
+        compiler = env.Detect(compilers)
+        env['SWIFTC'] = compiler if compiler else compilers[0]
+    env['SWIFTFLAGS'] = SCons.Util.CLVar('')
+    env['SWIFTCCOM']   = '$SWIFTC -o $TARGET -c $SWIFTFLAGS $SOURCES'
+    env['SWIFTFILESUFFIX'] = SwiftSuffix
+
+def exists(env):
+    return env.Detect(compilers)