diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 587996a8b9..dfd1b051ed 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -1,3 +1,7 @@
+19990724-11:50 CET Patrick Mast <harbour@PatrickMast.com>
+  * Makefile.b16 and Makefile.b32
+    added -DHARBOUR_USE_GTAPI swicth
+
 19990723-06:39 EDT Paul Tucker <ptucker@sympatico.ca>
    * source/rtl/gtapi.c
    * source/rtl/setcolor.c
diff --git a/harbour/makefile.b16 b/harbour/makefile.b16
index e167fc6e80..e0b77f0c16 100644
--- a/harbour/makefile.b16
+++ b/harbour/makefile.b16
@@ -26,7 +26,7 @@ libs\win16\terminal.lib : console.obj
 console.obj  : console.c  extend.h hbdefs.h
   bcc -c -O2 -I.\include -o$@ source\rtl\console.c
   tlib .\libs\b16\terminal.lib -+$@,,
-  bcc -c -O2 -DWINDOWS -I.\include -o$@ source\rtl\console.c
+  bcc -c -O2 -DWINDOWS _DHARBOUR_USE_GTAPI -I.\include -o$@ source\rtl\console.c
   tlib .\libs\win16\terminal.lib -+$@,,
 
 arrays.obj   : arrays.c   extend.h hbdefs.h
@@ -75,7 +75,8 @@ tclass.c     : tclass.prg    harbour.exe
   bin\harbour $< /n /osource\rtl
 
 .c.obj:
-  bcc -c -ml -O2 -I.\include -o$@ $<
+  bcc -c -ml -O2 -I.\include -o$@ -DHARBOUR_USE_GTAPI $<
+
   tlib .\libs\b16\harbour.lib -+$@,,
 
 harbour.exe : harboury.c harbourl.c harbour.obj
diff --git a/harbour/makefile.b32 b/harbour/makefile.b32
index 234c045708..3b5477dec5 100644
--- a/harbour/makefile.b32
+++ b/harbour/makefile.b32
@@ -77,7 +77,8 @@ tclass.c     : tclass.prg    harbour.exe
   bin\harbour $< /n /osource\rtl /iinclude
 
 .c.obj:
-  bcc32 -c -O2 -I.\include -o$@ $<
+  bcc32 -c -O2 -I.\include -o$@ -DHARBOUR_USE_GTAPI $<
+
   tlib .\libs\b32\harbour.lib -+$@,,
 
 harbour.exe : harboury.c harbourl.c genobj32.obj harbour.obj compiler.h hbppint.c hbpp.c table.c