diff --git a/patches/cgx-4.2/WritePixelArrayAlpha.diff b/patches/cgx-4.2/WritePixelArrayAlpha.diff
new file mode 100644
index 0000000..fdaebbb
--- /dev/null
+++ b/patches/cgx-4.2/WritePixelArrayAlpha.diff
@@ -0,0 +1,25 @@
+--- CGraphX/C/Include/clib/cybergraphics_protos.h.orig	2017-01-11 00:55:08.000000000 +0100
++++ CGraphX/C/Include/clib/cybergraphics_protos.h	2017-01-11 00:54:31.000000000 +0100
+@@ -44,6 +44,8 @@
+ void         UnLockBitMap(APTR);
+ ULONG        WritePixelArray(APTR, UWORD, UWORD, UWORD, struct RastPort *, UWORD,
+                              UWORD, UWORD, UWORD, UBYTE);
++ULONG        WritePixelArrayAlpha(APTR, UWORD, UWORD, UWORD, struct RastPort *,
++                                  UWORD, UWORD, UWORD, UWORD, ULONG);
+ ULONG        WriteLUTPixelArray(APTR, UWORD, UWORD, UWORD, struct RastPort *, APTR,
+ 			        UWORD, UWORD, UWORD, UWORD, UBYTE);
+ LONG         WriteRGBPixel(struct RastPort *, UWORD, UWORD, ULONG);
+--- CGraphX/FD/cybergraphics_lib.fd.orig	2017-01-11 00:50:21.000000000 +0100
++++ CGraphX/FD/cybergraphics_lib.fd	2017-01-11 00:52:18.000000000 +0100
+@@ -67,4 +67,11 @@
+ ##public
+ *
+ WriteLUTPixelArray(srcRect,SrcX,SrcY,SrcMod,RastPort,ColorTab,DestX,DestY,SizeX,SizeY,CTFormat)(a0,d0,d1,d2,a1,a2,d3,d4,d5,d6,d7)
++*
++##private
++cgfxPrivate8()()
++cgfxPrivate9()()
++##public
++*
++WritePixelArrayAlpha(Src,SrcX,SrcY,SrcMod,RastPort,DestX,DestY,Width,Height,GlobalAlpha)(a0,d0,d1,d2,a1,d3,d4,d5,d6,d7)
+ ##end
diff --git a/toolchain-m68k b/toolchain-m68k
index f9b75d3..e096aa0 100755
--- a/toolchain-m68k
+++ b/toolchain-m68k
@@ -578,8 +578,8 @@ def add_lib(src, libname):
 
 
 @recipe('install-sdk', 1)
-def process_sdk(sdk, dirname, files):
-  with cwd(path.join('{sources}', dirname)):
+def process_sdk(sdk, lib_name, files):
+  with cwd(path.join('{sources}', sdk)):
     for f in files:
       kind = f[0]
 
@@ -621,7 +621,7 @@ def process_sdk(sdk, dirname, files):
       elif kind == 'lib':
         filename = f[1]
         c_file = re.sub(r'_lib.sfd$', r'.c', path.basename(filename))
-        lib_file = 'lib' + sdk + '.a'
+        lib_file = 'lib' + lib_name + '.a'
 
         info('lib: %s -> %s', filename, c_file)
         execute('sfdc', '--quiet', '--target=m68k-amigaos', '--mode=stubs',
@@ -667,14 +667,18 @@ def install_sdk(*names):
 
     desc, files = read_sdk(filename)
 
+    pkg = name + '-' + desc['version']
+    _, ext = path.splitext(path.basename(desc['url']))
+
     with cwd('{archives}'):
-      fetch(path.basename(desc['url']), desc['url'])
+      fetch(pkg + ext, desc['url'])
 
-    basename = path.splitext(path.basename(desc['url']))[0]
+    unpack(pkg, top_dir='.')
 
-    unpack(basename, top_dir='.')
+    if path.isdir(path.join('{patches}', pkg)):
+      patch(pkg, work_dir=path.join('{sources}', pkg))
 
-    process_sdk(name, basename, files)
+    process_sdk(pkg, name, files)
 
 
 def test():