Index: postfix/makedefs
===================================================================
--- postfix.orig/makedefs
+++ postfix/makedefs
@@ -634,7 +634,7 @@ EOF
 		: ${SHLIB_ENV="LD_LIBRARY_PATH=`pwd`/lib"}
 		: ${PLUGIN_LD="${CC-gcc} -shared"}
 		;;
- Linux.[345].*)	SYSTYPE=LINUX$RELEASE_MAJOR
+ Linux.[3456].*)	SYSTYPE=LINUX$RELEASE_MAJOR
 		case "$CCARGS" in
 		 *-DNO_DB*) ;;
 		 *-DHAS_DB*) ;;
Index: postfix/src/util/sys_defs.h
===================================================================
--- postfix.orig/src/util/sys_defs.h
+++ postfix/src/util/sys_defs.h
@@ -751,7 +751,7 @@ extern int initgroups(const char *, int)
  /*
   * LINUX.
   */
-#if defined(LINUX2) || defined(LINUX3) || defined(LINUX4) || defined(LINUX5)
+#if defined(LINUX2) || defined(LINUX3) || defined(LINUX4) || defined(LINUX5) || defined(LINUX6)
 #define SUPPORTED
 #define UINT32_TYPE	unsigned int
 #define UINT16_TYPE	unsigned short
