diff --git a/ChangeLog b/ChangeLog
index d9b66c44..29cba157 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2012-08-15  Rene Liebscher <R.Liebscher@gmx.de>
+
+	bug #30559 Ft232 bit-bang support, see comment #30
+	* ft245r.c: added semaphore workaround for MacOS X,
+	            added pthread_testcancel in reader thread
+	
+	* configure.ac: added check for TYPE_232H in libftdi (not in libftdi < 0.20)
+	* avrftdi.c: do not use TYPE_232H if not declared
+
 2012-08-13  Hannes Weisbach <hannes_weisbach@gmx.net>
 
 	* avrftdi.c: fixes pin_limit for different FTDI devices (there was a mixup
diff --git a/avrftdi.c b/avrftdi.c
index 67f06f98..7546ed85 100644
--- a/avrftdi.c
+++ b/avrftdi.c
@@ -774,7 +774,9 @@ static int avrftdi_open(PROGRAMMER * pgm, char *port)
 			pdata->pin_limit = 11;
 			break;
 		case TYPE_2232H:
+#ifdef HAVE_LIBFTDI_TYPE_232H
 		case TYPE_232H:
+#endif
 			pdata->pin_limit = 15;
 			break;
 		case TYPE_4232H:
diff --git a/configure.ac b/configure.ac
index 7d7c96ab..43f6dcd8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -147,10 +147,16 @@ fi
 AC_SUBST(LIBUSB_1_0, $LIBUSB_1_0)
 AH_TEMPLATE([HAVE_LIBFTDI],
             [Define if FTDI support is enabled via libftdi])
+AH_TEMPLATE([HAVE_LIBFTDI_TYPE_232H],
+            [Define if libftdi supports FT232H, libftdi version >= 0.20])
 AC_CHECK_LIB([ftdi], [ftdi_usb_get_strings], [have_libftdi=yes], [], [-lusb])
 if test x$have_libftdi = xyes; then
    LIBFTDI="-lftdi -lusb"
    AC_DEFINE([HAVE_LIBFTDI])
+   AC_CHECK_DECL(TYPE_232H,[have_libftdi_FT232H=yes], [], [[#include <ftdi.h>]])
+   if test x$have_libftdi_FT232H = xyes; then
+      AC_DEFINE([HAVE_LIBFTDI_TYPE_232H])
+   fi
 fi
 AC_SUBST(LIBFTDI, $LIBFTDI)
 AC_CHECK_HEADERS([pthread.h])
diff --git a/ft245r.c b/ft245r.c
index fa4f8f32..e6033a18 100644
--- a/ft245r.c
+++ b/ft245r.c
@@ -73,7 +73,19 @@
 #ifdef HAVE_PTHREAD_H
 
 #include <pthread.h>
+
+#ifdef __APPLE__
+/* Mac OS X defines sem_init but actually does not implement them */
+#include <dispatch/dispatch.h>
+
+typedef dispatch_semaphore_t	sem_t;
+
+#define sem_init(psem,x,val)	*psem = dispatch_semaphore_create(val)
+#define sem_post(psem)		dispatch_semaphore_signal(*psem)
+#define sem_wait(psem)		dispatch_semaphore_wait(*psem, DISPATCH_TIME_FOREVER)
+#else
 #include <semaphore.h>
+#endif
 
 #ifdef HAVE_LIBFTDI
 
@@ -130,6 +142,7 @@ static void *reader (void *arg) {
     int br, i;
 
     while (1) {
+        pthread_testcancel();
         br = ftdi_read_data (handle, buf, sizeof(buf));
         for (i=0; i<br; i++)
             add_to_buf (buf[i]);