diff --git a/gtk2_ardour/wscript b/gtk2_ardour/wscript
index 3a9e8a118b..ae7f48c497 100644
--- a/gtk2_ardour/wscript
+++ b/gtk2_ardour/wscript
@@ -156,7 +156,7 @@ gtk2_ardour_sources = [
         'main.cc',
         'main_clock.cc',
         'marker.cc',
-    	'mergeable_line.cc',
+        'mergeable_line.cc',
         'midi_automation_line.cc',
         'midi_channel_dialog.cc',
         'midi_channel_selector.cc',
@@ -876,7 +876,7 @@ def build(bld):
         obj.stdin = 'livetrax.menus.in'
     else:
         obj.stdin = 'ardour.menus.in'
-    obj.stdout = 'ardour.menus'        
+    obj.stdout = 'ardour.menus'
     bld.install_files (bld.env['CONFDIR'], 'ardour.menus')
 
     # Freedesktop
diff --git a/libs/aaf/wscript b/libs/aaf/wscript
index e6a1337b5a..491c3b8c97 100644
--- a/libs/aaf/wscript
+++ b/libs/aaf/wscript
@@ -16,22 +16,22 @@ top = '.'
 out = 'build'
 
 libaaf_sources = [
-	'AAFClass.c',
-	'AAFCore.c',
-	'AAFDump.c',
-	'AAFIEssenceFile.c',
-	'AAFIface.c',
-	'AAFIParser.c',
-	'AAFToText.c',
-	'CFBDump.c',
-	'LibCFB.c',
-	'ProTools.c',
-	'MediaComposer.c',
-	'Resolve.c',
-	'RIFFParser.c',
-	'URIParser.c',
-	'utils.c',
-	'log.c',
+    'AAFClass.c',
+    'AAFCore.c',
+    'AAFDump.c',
+    'AAFIEssenceFile.c',
+    'AAFIface.c',
+    'AAFIParser.c',
+    'AAFToText.c',
+    'CFBDump.c',
+    'LibCFB.c',
+    'ProTools.c',
+    'MediaComposer.c',
+    'Resolve.c',
+    'RIFFParser.c',
+    'URIParser.c',
+    'utils.c',
+    'log.c',
 ]
 
 def options(opt):
diff --git a/libs/surfaces/launchpad_pro/wscript b/libs/surfaces/launchpad_pro/wscript
index 4586eca48c..4c6bb57a7c 100644
--- a/libs/surfaces/launchpad_pro/wscript
+++ b/libs/surfaces/launchpad_pro/wscript
@@ -12,9 +12,9 @@ def configure(conf):
 def build(bld):
     obj = bld(features = 'cxx cxxshlib')
     obj.source = '''
-	lppro.cc
-	interface.cc
-	gui.cc
+        lppro.cc
+        interface.cc
+        gui.cc
     '''
     obj.defines      = [ 'PACKAGE="ardour_launchpad_pro"' ]
     obj.defines     += [ 'ARDOURSURFACE_DLL_EXPORTS' ]
diff --git a/libs/surfaces/launchpad_x/wscript b/libs/surfaces/launchpad_x/wscript
index f5588ce632..4473ed1f91 100644
--- a/libs/surfaces/launchpad_x/wscript
+++ b/libs/surfaces/launchpad_x/wscript
@@ -5,7 +5,7 @@ import os
 lpxm_sources = [
     'lpx.cc',
     'gui.cc',
-]    
+]
 
 def options(opt):
     pass
diff --git a/libs/tk/ytk/wscript b/libs/tk/ytk/wscript
index 63e1c2afc5..ea5484b258 100644
--- a/libs/tk/ytk/wscript
+++ b/libs/tk/ytk/wscript
@@ -286,9 +286,9 @@ def build(bld):
                             'GTK_VERSION="2.24.23"', 'GTK_BINARY_VERSION="2.10.0"', 'GTK_HOST="ardour"',
                             'PACKAGE="' + I18N_PACKAGE + '"',
                             'GETTEXT_PACKAGE="' + I18N_PACKAGE + '"',
-                            'GTK_DATA_PREFIX="' + bld.env['PREFIX'] + '"', 
-                            'GTK_SYSCONFDIR="' + bld.env['SYSCONFDIR'] + '"', 
-                            'GTK_DATA_DIR="' + bld.env['DATADIR'] + '"', 
+                            'GTK_DATA_PREFIX="' + bld.env['PREFIX'] + '"',
+                            'GTK_SYSCONFDIR="' + bld.env['SYSCONFDIR'] + '"',
+                            'GTK_DATA_DIR="' + bld.env['DATADIR'] + '"',
                             'GTK_LIBDIR="' + bld.env['LIBDIR'] + '"',
                           ]
     obj.vnum            = LIBYDK_VERSION