diff --git a/src/acc/acc.h b/src/acc/acc.h
index f21190b9..01e50a58 100644
--- a/src/acc/acc.h
+++ b/src/acc/acc.h
@@ -27,7 +27,7 @@
 #ifndef __ACC_H_INCLUDED
 #define __ACC_H_INCLUDED 1
 
-#define ACC_VERSION     20040511L
+#define ACC_VERSION     20040623L
 
 #if !defined(ACC_CONFIG_INCLUDE)
 #  define ACC_CONFIG_INCLUDE(file)     file
diff --git a/src/acc/acc_auto.h b/src/acc/acc_auto.h
index f3f727d8..4ac4a09f 100644
--- a/src/acc/acc_auto.h
+++ b/src/acc/acc_auto.h
@@ -205,6 +205,18 @@
 #  undef HAVE_SYS_STAT_H
 #  undef HAVE_SYS_TIME_H
 #  undef HAVE_SYS_TYPES_H
+#elif (ACC_OS_WIN32 && ACC_CC_PELLESC)
+#  undef HAVE_DIRENT_H
+#  undef HAVE_DOS_H
+#  undef HAVE_MALLOC_H
+#  undef HAVE_SHARE_H
+#  undef HAVE_UNISTD_H
+#  undef HAVE_UTIME_H
+#  undef HAVE_SYS_TIME_H
+#  if (__POCC__ < 280)
+#  else
+#    define HAVE_SYS_UTIME_H 1
+#  endif
 #elif (ACC_OS_WIN32 && ACC_CC_PGI) && defined(__MINGW32__)
 #  undef HAVE_UTIME_H
 #  define HAVE_SYS_UTIME_H 1
@@ -462,6 +474,11 @@
 #  undef HAVE_STRFTIME
 #  undef HAVE_UTIME
 #  undef HAVE_VSNPRINTF
+#elif (ACC_OS_WIN32 && ACC_CC_PELLESC)
+#  if (__POCC__ < 280)
+#    define alloca _alloca
+#    undef HAVE_UTIME
+#  endif
 #elif (ACC_OS_WIN32 && ACC_CC_PGI) && defined(__MINGW32__)
 #  define snprintf _snprintf
 #  define vsnprintf _vsnprintf
@@ -592,7 +609,7 @@
 #elif (ACC_ARCH_IA32 && (ACC_CC_INTELC && defined(__linux__)))
 #  define SIZEOF_LONG_LONG          8
 #  define SIZEOF_UNSIGNED_LONG_LONG 8
-#elif (ACC_ARCH_IA32 && (ACC_CC_MWERKS || ACC_CC_PGI))
+#elif (ACC_ARCH_IA32 && (ACC_CC_MWERKS || ACC_CC_PELLESC || ACC_CC_PGI))
 #  define SIZEOF_LONG_LONG          8
 #  define SIZEOF_UNSIGNED_LONG_LONG 8
 #elif (ACC_ARCH_IA32 && (ACC_CC_INTELC || ACC_CC_MSC))
diff --git a/src/acc/acc_cc.h b/src/acc/acc_cc.h
index 557ea423..6b317649 100644
--- a/src/acc/acc_cc.h
+++ b/src/acc/acc_cc.h
@@ -25,6 +25,10 @@
 #  define ACC_CC_INTELC         1
 #  define ACC_INFO_CC           "Intel C"
 #  define ACC_INFO_CCVER        ACC_CPP_MACRO_EXPAND(__INTEL_COMPILER)
+#elif defined(__POCC__)
+#  define ACC_CC_PELLESC        1
+#  define ACC_INFO_CC           "Pelles C"
+#  define ACC_INFO_CCVER        ACC_CPP_MACRO_EXPAND(__POCC__)
 #elif defined(__GNUC__) && defined(__VERSION__)
 #  if defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
 #    define ACC_CC_GNUC         (__GNUC__ * 0x10000L + __GNUC_MINOR__ * 0x100 + __GNUC_PATCHLEVEL__)
diff --git a/src/acc/acc_defs.h b/src/acc/acc_defs.h
index 6ffe3491..fe98aabb 100644
--- a/src/acc/acc_defs.h
+++ b/src/acc/acc_defs.h
@@ -42,6 +42,8 @@
 #  define acc_inline            __inline
 #elif (ACC_CC_PGI)
 #  define acc_inline            __inline__
+#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901)
+#  define acc_inline            inline
 #endif
 
 
diff --git a/src/acc/acc_lib.h b/src/acc/acc_lib.h
index cd16fe8a..9def79a2 100644
--- a/src/acc/acc_lib.h
+++ b/src/acc/acc_lib.h
@@ -315,13 +315,12 @@ ACCLIB_EXTERN(acc_uint32l_t, acc_umuldiv32) (acc_uint32l_t, acc_uint32l_t, acc_u
 
 
 /*************************************************************************
-// uclock
+// uclock (real, i.e. "wall" clock)
 **************************************************************************/
 
 #if defined(acc_int32e_t)
 ACCLIB_EXTERN(int, acc_tsc_read) (acc_uint32e_t*);
 ACCLIB_EXTERN(int, acc_tsc_read_add) (acc_uint32e_t*);
-#define acc_rdtsc(x)    acc_tsc_read(x)
 #endif
 
 
@@ -361,6 +360,47 @@ ACCLIB_EXTERN(void, acc_uclock_read) (acc_uclock_handle_p, acc_uclock_p);
 ACCLIB_EXTERN(double, acc_uclock_get_elapsed) (acc_uclock_handle_p, const acc_uclock_p, const acc_uclock_p);
 
 
+/*************************************************************************
+// performance counters (virtual clock)
+**************************************************************************/
+
+#if defined(acc_int64l_t)
+
+typedef struct { /* all private */
+#if (ACC_OS_POSIX_LINUX)
+    void* h;
+    unsigned cpu_type, cpu_features, cpu_khz, cpu_nrctrs;
+    const char* cpu_name;
+#else
+    void* h;
+#endif
+} acc_perfctr_handle_t;
+
+typedef struct {
+    acc_uint64l_t tsc;
+#if (ACC_OS_POSIX_LINUX)
+    acc_uint64l_t pmc[18];
+#else
+    acc_uint64l_t pmc[1];
+#endif
+} acc_perfctr_clock_t;
+
+#ifndef acc_perfctr_handle_p
+#define acc_perfctr_handle_p acc_perfctr_handle_t *
+#endif
+#ifndef acc_perfctr_clock_p
+#define acc_perfctr_clock_p acc_perfctr_clock_t *
+#endif
+
+ACCLIB_EXTERN(int, acc_perfctr_open)  (acc_perfctr_handle_p);
+ACCLIB_EXTERN(int, acc_perfctr_close) (acc_perfctr_handle_p);
+ACCLIB_EXTERN(void, acc_perfctr_read) (acc_perfctr_handle_p, acc_perfctr_clock_p);
+ACCLIB_EXTERN(double, acc_perfctr_get_elapsed) (acc_perfctr_handle_p, const acc_perfctr_clock_p, const acc_perfctr_clock_p);
+ACCLIB_EXTERN(double, acc_perfctr_get_elapsed_tsc) (acc_perfctr_handle_p, acc_uint64l_t);
+
+#endif
+
+
 /*************************************************************************
 // Big Endian / Little Endian
 **************************************************************************/
diff --git a/src/acc/acclib/misc.ch b/src/acc/acclib/misc.ch
index a2ced8a0..e0275ecc 100644
--- a/src/acc/acclib/misc.ch
+++ b/src/acc/acclib/misc.ch
@@ -34,7 +34,9 @@ ACCLIB_PUBLIC(acclib_handle_t, acc_get_osfhandle) (int fd)
 #elif (ACC_OS_WIN32 && ACC_CC_GNUC) && defined(__PW32__)
     return -1; /* FIXME */
 #elif (ACC_OS_WIN32 || ACC_OS_WIN64)
-# if (ACC_CC_WATCOMC && (__WATCOMC__ < 1000))
+# if (ACC_CC_PELLESC && (__POCC__ < 280))
+    return -1; /* FIXME */
+# elif (ACC_CC_WATCOMC && (__WATCOMC__ < 1000))
     return -1; /* FIXME */
 # elif (ACC_CC_WATCOMC && (__WATCOMC__ < 1100))
     return _os_handle(fd);
diff --git a/src/acc/acclib/uclock.ch b/src/acc/acclib/uclock.ch
index e9034e42..2e6fcd1a 100644
--- a/src/acc/acclib/uclock.ch
+++ b/src/acc/acclib/uclock.ch
@@ -43,7 +43,7 @@
 #    if 1
 #      include <mmsystem.h>
 #    else
-#      if (ACC_CC_INTELC || ACC_CC_MSC)
+#      if (ACC_CC_INTELC || ACC_CC_MSC || ACC_CC_PELLESC)
          ACC_EXTERN_C __declspec(dllimport) unsigned long __stdcall timeGetTime(void);
 #      else
          ACC_EXTERN_C unsigned long __stdcall timeGetTime(void);
@@ -51,7 +51,7 @@
 #    endif
 #    if (ACC_CC_DMC)
 #      pragma DMC includelib "winmm.lib"
-#    elif (ACC_CC_INTELC || ACC_CC_MSC)
+#    elif (ACC_CC_INTELC || ACC_CC_MSC || ACC_CC_PELLESC)
 #      pragma comment(lib, "winmm.lib")
 #    elif (ACC_CC_MWERKS && (__MWERKS__ >= 0x3000))
 #      pragma comment(lib, "winmm.lib")
@@ -94,6 +94,8 @@ ACCLIB_PUBLIC(int, acc_uclock_open) (acc_uclock_handle_p h)
             h->qpf = 0.0;
         }
     }
+#elif (ACC_HAVE_WINDOWS_H) && defined(acc_int64l_t)
+    h->qpf = 0.0;
 #endif
     h->h = 1;
     h->mode = 0;
@@ -119,6 +121,10 @@ ACCLIB_PUBLIC(int, acc_uclock_close) (acc_uclock_handle_p h)
 }
 
 
+/*************************************************************************
+//
+**************************************************************************/
+
 ACCLIB_PUBLIC(void, acc_uclock_read) (acc_uclock_handle_p h, acc_uclock_p c)
 {
 #if (__ACCLIB_UCLOCK_USE_QPC)
@@ -131,6 +137,8 @@ ACCLIB_PUBLIC(void, acc_uclock_read) (acc_uclock_handle_p h, acc_uclock_p c)
         }
         c->qpc = 0; /* failed */
     }
+#elif (ACC_HAVE_WINDOWS_H) && defined(acc_int64l_t)
+    /* c->qpc = 0; */
 #endif
 
     {
@@ -166,6 +174,10 @@ ACCLIB_PUBLIC(void, acc_uclock_read) (acc_uclock_handle_p h, acc_uclock_p c)
 }
 
 
+/*************************************************************************
+//
+**************************************************************************/
+
 ACCLIB_PUBLIC(double, acc_uclock_get_elapsed) (acc_uclock_handle_p h, const acc_uclock_p start, const acc_uclock_p stop)
 {
     double d;