diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 0204eb2800..31ad72c6e1 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,24 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-06-18 15:32 UTC+0200 Przemyslaw Czerpak (druzus/at/poczta.onet.pl)
+  * harbour/src/3rd/pcre/Makefile
+    * disabled JIT support in default builds.
+      It fixes build process for platforms which do not support MT mode
+      like some old Linux distors. I also made runtime tests with some
+      simple expressions and on x86 based CPUs the difference is really
+      minor. PCRE compiled with JIT is a little bit faster in regex
+      compilation (~5%) but slower in regex evaluation (10%).
+      AFAIR completely different results then suggested by documentation.
+      For tests I used rather simple expression on small data set:
+         cData := hb_TSToStr( hb_datetime() )
+         cExp := "[:]([a-zA-Z]|[0-9])[0-9][:]..[.]"
+      But such short expressions and data are quite common in real
+      programs.
+      If someone wants to enable JIT in his build then he can make it
+      using SUPPORT_JIT macro, i.e.:
+         export HB_USER_CFLAGS=-DSUPPORT_JIT
+
 2012-06-18 12:49 UTC+0200 Viktor Szakats (harbour syenar.net)
   * utils/hbmk2/hbmk2.prg
     * made --hbinfo to return information only for the top project
diff --git a/harbour/src/3rd/pcre/Makefile b/harbour/src/3rd/pcre/Makefile
index b70f98798a..0654dd9ece 100644
--- a/harbour/src/3rd/pcre/Makefile
+++ b/harbour/src/3rd/pcre/Makefile
@@ -48,13 +48,9 @@ ifneq ($(HB_HAS_PCRE_LOCAL),)
    endif
    endif
 
-   ifneq ($(filter $(HB_COMPILER),mingw mingw64 msvc mvc64),)
-      HB_CFLAGS += -DSUPPORT_JIT
-   else
-   ifneq ($(filter $(HB_PLATFORM),darwin linux),)
-      HB_CFLAGS += -DSUPPORT_JIT
-   endif
-   endif
+#   ifneq ($(filter $(HB_COMPILER),mingw mingw64 msvc mvc64)$(filter $(HB_PLATFORM),darwin linux),)
+#      HB_CFLAGS += -DSUPPORT_JIT
+#   endif
 
    HB_CFLAGS += -DHAVE_CONFIG_H