diff --git a/src/acc/acc.h b/src/acc/acc.h
index 8c85ef4d..75581521 100644
--- a/src/acc/acc.h
+++ b/src/acc/acc.h
@@ -22,7 +22,7 @@
  */
 
 
-#define ACC_VERSION     20030325L
+#define ACC_VERSION     20030401L
 
 #if !defined(ACC_CONFIG_INCLUDE)
 #  define ACC_CONFIG_INCLUDE(file)     file
diff --git a/src/acc/acc_arch.h b/src/acc/acc_arch.h
index 14c1b33a..764a8963 100644
--- a/src/acc/acc_arch.h
+++ b/src/acc/acc_arch.h
@@ -35,13 +35,13 @@
 #  define ACC_INFO_ARCH             "ia16"
 #elif (ACC_OS_DOS32 || ACC_OS_OS2 || ACC_OS_WIN32)
 #  if defined(_MSC_VER) && !defined(_M_IX86)
-#    error
+#    error "unexpected CPU architechture"
 #  endif
 #  define ACC_ARCH_IA32             1
 #  define ACC_INFO_ARCH             "ia32"
 #elif (ACC_OS_WIN64)
 #  if defined(_MSC_VER) && !defined(_M_IA64)
-#    error
+#    error "unexpected CPU architechture"
 #  endif
 #  define ACC_ARCH_IA64             1
 #  define ACC_INFO_ARCH             "ia64"
diff --git a/src/acc/acc_auto.h b/src/acc/acc_auto.h
index 6749c9c0..36f99c16 100644
--- a/src/acc/acc_auto.h
+++ b/src/acc/acc_auto.h
@@ -41,6 +41,8 @@
 #define HAVE_SYS_UTIME_H 1
 #define HAVE_SYS_TYPES_H 1
 
+#undef HAVE_STRINGS_H
+
 
 #if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
 #  undef HAVE_CONIO_H
@@ -48,6 +50,14 @@
 #  undef HAVE_IO_H
 #  undef HAVE_SHARE_H
 #  undef HAVE_SYS_UTIME_H
+#  define HAVE_STRINGS_H 1
+#elif defined(__dietlibc__)
+#  undef HAVE_CONIO_H
+#  undef HAVE_DOS_H
+#  undef HAVE_IO_H
+#  undef HAVE_SHARE_H
+#  undef HAVE_SYS_UTIME_H
+#  define HAVE_STRINGS_H 1
 #elif (ACC_CC_BORLANDC)
 #  undef HAVE_UNISTD_H
 #  undef HAVE_SYS_TIME_H
@@ -62,12 +72,15 @@
 #  undef HAVE_SYS_UTIME_H
 #elif (ACC_CC_GNUC && ACC_OS_WIN32 && defined(__MINGW32__))
 #  undef HAVE_UTIME_H
-#elif (ACC_CC_GNUC && ACC_OS_TOS && defined(__MINT__))
+#elif (ACC_CC_GNUC && ACC_OS_TOS)
 #  undef HAVE_CONIO_H
 #  undef HAVE_DOS_H
 #  undef HAVE_IO_H
 #  undef HAVE_SHARE_H
 #  undef HAVE_SYS_UTIME_H
+#  if !defined(__MINT__)
+#    undef HAVE_MALLOC_H
+#  endif
 #elif (ACC_CC_INTELC && ACC_OS_WIN32)
 #  undef HAVE_UNISTD_H
 #  undef HAVE_UTIME_H
@@ -244,6 +257,9 @@
 #if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
 #  undef HAVE_GETUMASK
 #  undef HAVE_SETMODE
+#elif defined(__dietlibc__)
+#  undef HAVE_GETUMASK
+#  undef HAVE_SETMODE
 #elif (ACC_CC_BORLANDC)
 #  if (__BORLANDC__ < 0x500)
 #    undef HAVE_DIFFTIME /* difftime() is in the math library */
@@ -259,8 +275,13 @@
 #  undef HAVE_SNPRINTF
 #  undef HAVE_VSNPRINTF
 #elif (ACC_CC_GNUC && ACC_OS_WIN32 && defined(__MINGW32__))
-#elif (ACC_CC_GNUC && ACC_OS_TOS && defined(__MINT__))
+#elif (ACC_CC_GNUC && ACC_OS_TOS)
 #  undef HAVE_SETMODE
+#  if !defined(__MINT__)
+#    undef HAVE_GETUMASK
+#    undef HAVE_SNPRINTF
+#    undef HAVE_VSNPRINTF
+#  endif
 #elif (ACC_CC_INTELC && ACC_OS_WIN32)
 #  define snprintf _snprintf
 #  define vsnprintf _vsnprintf