diff --git a/CHANGES b/CHANGES
index 27c1f8d..f65203e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,4 @@
 
-
 security:
 	(CVE Id pending)
 	Fixed problems with signal handling caused by use of not async signal
@@ -104,6 +103,10 @@ porting:
 
 	Joachim Fenkes provided an new adapted spec file.
 
+	Type bool and macros Min and Max are defined by socat which led to
+	compile errors when they were already provided by build framework.
+	Thanks to Liyu Liu for providing a patch.
+
 testing:
 	Do not distribute testcert.conf with socat source but generate it
 	(and new testcert6.conf) during test.sh run.
diff --git a/config.h.in b/config.h.in
index 47a408e..3ed5bff 100644
--- a/config.h.in
+++ b/config.h.in
@@ -452,6 +452,9 @@
 /* is sig_atomic_t declared */
 #undef HAVE_TYPE_SIG_ATOMIC_T
 
+/* is bool already typedef'd? */
+#undef HAVE_TYPE_BOOL
+
 /* is socklen_t already typedef'd? */
 #undef HAVE_TYPE_SOCKLEN
 
diff --git a/configure.in b/configure.in
index 76ee9fb..52d0293 100644
--- a/configure.in
+++ b/configure.in
@@ -766,6 +766,16 @@ AC_MSG_RESULT($sc_cv_type_longlong)
 
 AC_CHECK_TYPE(sig_atomic_t,AC_DEFINE(HAVE_TYPE_SIG_ATOMIC_T),,[#include "sysincludes.h"])
 
+AC_MSG_CHECKING(for bool)
+AC_CACHE_VAL(sc_cv_type_bool,
+[AC_TRY_COMPILE([],[bool b;],
+[sc_cv_type_bool=yes],
+[sc_cv_type_bool=no])])
+if test $sc_cv_type_bool = yes; then
+   AC_DEFINE(HAVE_TYPE_BOOL)
+fi
+AC_MSG_RESULT($sc_cv_type_bool)
+
 # following builtin macro does not check unistd.h and sys/socket.h where
 # socklen_t might be defined
 #AC_CHECK_TYPE(socklen_t, int)
diff --git a/mytypes.h b/mytypes.h
index f625314..23193d5 100644
--- a/mytypes.h
+++ b/mytypes.h
@@ -1,5 +1,5 @@
 /* source: mytypes.h */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 #ifndef __mytypes_h_included
@@ -7,10 +7,18 @@
 
 /* some types and macros I miss in C89 */
 
+#ifndef HAVE_TYPE_BOOL
+#  undef bool
 typedef enum { false, true } bool;
+#endif
 
+#ifndef Min
 #define Min(x,y) ((x)<=(y)?(x):(y))
+#endif
+
+#ifndef Max
 #define Max(x,y) ((x)>=(y)?(x):(y))
+#endif
 
 #define SOCKADDR_MAX UNIX_PATH_MAX