diff --git a/Source/exehead/Main.c b/Source/exehead/Main.c
index 00b3135f..03942b51 100644
--- a/Source/exehead/Main.c
+++ b/Source/exehead/Main.c
@@ -221,7 +221,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpszCmdParam,
   ret = ui_doinstall();
 
 #ifdef NSIS_CONFIG_LOG
+#ifndef NSIS_CONFIG_LOG_ODS
   log_write(1);
+#endif//!NSIS_CONFIG_LOG_ODS
 #endif//NSIS_CONFIG_LOG
 end:
 
diff --git a/Source/exehead/Ui.c b/Source/exehead/Ui.c
index 3a0f8c96..adc378e7 100644
--- a/Source/exehead/Ui.c
+++ b/Source/exehead/Ui.c
@@ -123,11 +123,13 @@ static BOOL NSISCALL _HandleStaticBkColor(UINT uMsg, WPARAM wParam, LPARAM lPara
 #endif//!NSIS_CONFIG_ENHANCEDUI_SUPPORT
 
 #ifdef NSIS_CONFIG_LOG
+#ifndef NSIS_CONFIG_LOG_ODS
 void NSISCALL build_g_logfile()
 {
   lstrcat(addtrailingslash(mystrcpy(g_log_file,state_install_directory)),"install.log");
 }
 #endif
+#endif
 
 int *cur_langtable;
 
@@ -225,7 +227,9 @@ int NSISCALL ui_doinstall(void)
 #ifdef NSIS_CONFIG_LOG
   if (g_flags & CH_FLAGS_SILENT_LOG && !g_is_uninstaller)
   {
+#ifndef NSIS_CONFIG_LOG_ODS
     build_g_logfile();
+#endif
     log_dolog=1;
   }
 #endif
@@ -754,7 +758,9 @@ static BOOL CALLBACK DirProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPar
     GetUIText(IDC_DIR,dir,NSIS_MAX_STRLEN);
     validate_filename(dir);
 #ifdef NSIS_CONFIG_LOG
+#ifndef NSIS_CONFIG_LOG_ODS
     build_g_logfile();
+#endif
     log_dolog = IsDlgButtonChecked(hwndDlg,IDC_CHECK1);
 #endif
   }
diff --git a/Source/exehead/config.h b/Source/exehead/config.h
index 8174ca27..c8451c89 100644
--- a/Source/exehead/config.h
+++ b/Source/exehead/config.h
@@ -115,7 +115,12 @@
 // turning this on (by uncommenting it) adds about
 // 4kb, but can be useful in debugging your installers.
 // NOT ENABLED BY DEFAULT.
-//#define NSIS_CONFIG_LOG
+// #define NSIS_CONFIG_LOG
+
+// NSIS_CONFIG_LOG_ODS makes the logging facility
+// use OutputDebugString instead of a file.
+// NOT ENABLED BY DEFAULT.
+// #define NSIS_CONFIG_LOG_ODS
 
 // NSIS_SUPPORT_BGBG enables support for the blue (well, whatever
 // color you want) gradient background window.
@@ -275,6 +280,11 @@
   #endif
 #endif
 
+#ifdef NSIS_CONFIG_LOG_ODS
+  #ifndef NSIS_CONFIG_LOG
+    #error NSIS_CONFIG_LOG_ODS relies on NSIS_CONFIG_LOG, but NSIS_CONFIG_LOG is not defined
+  #endif
+#endif
 
 #if defined(NSIS_CONFIG_CRC_SUPPORT) && defined(NSIS_CONFIG_VISIBLE_SUPPORT)
   #define _NSIS_CONFIG_VERIFYDIALOG
diff --git a/Source/exehead/exec.c b/Source/exehead/exec.c
index 50213d4f..c725f430 100644
--- a/Source/exehead/exec.c
+++ b/Source/exehead/exec.c
@@ -1476,7 +1476,9 @@ static int NSISCALL ExecuteEntry(entry *entry_)
         log_printf2("settings logging to %d",parm1);
         log_dolog=parm1;
         log_printf2("logging set to %d",parm1);
+#ifndef NSIS_CONFIG_LOG_ODS
         if (parm1) build_g_logfile();
+#endif
       }
       else
       {
diff --git a/Source/exehead/util.c b/Source/exehead/util.c
index 3da5e422..6fb56514 100644
--- a/Source/exehead/util.c
+++ b/Source/exehead/util.c
@@ -11,8 +11,10 @@
 #include "ui.h"
 
 #ifdef NSIS_CONFIG_LOG
+#ifndef NSIS_CONFIG_LOG_ODS
 char g_log_file[1024];
 #endif
+#endif
 
 #ifdef NSIS_SUPPORT_NAMED_USERVARS
   // *** DO NOT DECLARE MORE VARIABLES INSIDE THIS PRAGMAS ***
@@ -722,11 +724,12 @@ char * NSISCALL validate_filename(char *in) {
 }
 
 #ifdef NSIS_CONFIG_LOG
-char log_text[4096];
 int log_dolog;
+char log_text[NSIS_MAX_STRLEN*4];
+
+#ifndef NSIS_CONFIG_LOG_ODS
 void NSISCALL log_write(int close)
 {
-  extern char g_log_file[1024];
   static HANDLE fp=INVALID_HANDLE_VALUE;
   if (close)
   {
@@ -753,7 +756,22 @@ void NSISCALL log_write(int close)
     }
   }
 }
+#endif//!NSIS_CONFIG_LOG_ODS
+
+void log_printf(char *format, ...)
+{
+  va_list val;
+  va_start(val,format);
+  wvsprintf(log_text,format,val);
+  va_end(val);
+#ifdef NSIS_CONFIG_LOG_ODS
+  if (log_dolog)
+    OutputDebugString(log_text);
+#else
+  log_write(0);
 #endif
+}
+#endif//NSIS_CONFIG_LOG
 
 WIN32_FIND_DATA * NSISCALL file_exists(char *buf)
 {
diff --git a/Source/exehead/util.h b/Source/exehead/util.h
index 3f1b0b5d..e4d08ec4 100644
--- a/Source/exehead/util.h
+++ b/Source/exehead/util.h
@@ -25,13 +25,14 @@ BOOL NSISCALL my_SetDialogItemText(HWND dlg, UINT idx, const char *val);
 #ifdef NSIS_CONFIG_LOG
 extern char log_text[NSIS_MAX_STRLEN*4];
 void NSISCALL log_write(int close);
-#define log_printf(x1) wsprintf(log_text,x1); log_write(0)
-#define log_printf2(x1,x2) wsprintf(log_text,x1,x2); log_write(0)
-#define log_printf3(x1,x2,x3) wsprintf(log_text,x1,x2,x3); log_write(0)
-#define log_printf4(x1,x2,x3,x4) wsprintf(log_text,x1,x2,x3,x4); log_write(0)
-#define log_printf5(x1,x2,x3,x4,x5) wsprintf(log_text,x1,x2,x3,x4,x5); log_write(0)
-#define log_printf6(x1,x2,x3,x4,x5,x6) wsprintf(log_text,x1,x2,x3,x4,x5,x6); log_write(0)
-#define log_printf8(x1,x2,x3,x4,x5,x6,x7,x8) wsprintf(log_text,x1,x2,x3,x4,x5,x6,x7,x8); log_write(0)
+void log_printf(char *format, ...);
+#define log_printf2(x1,x2) wsprintf(log_text,x1,x2);
+#define log_printf3(x1,x2,x3) wsprintf(log_text,x1,x2,x3);
+#define log_printf4(x1,x2,x3,x4) wsprintf(log_text,x1,x2,x3,x4);
+#define log_printf5(x1,x2,x3,x4,x5) wsprintf(log_text,x1,x2,x3,x4,x5);
+#define log_printf6(x1,x2,x3,x4,x5,x6) wsprintf(log_text,x1,x2,x3,x4,x5,x6);
+#define log_printf6(x1,x2,x3,x4,x5,x6,x7) wsprintf(log_text,x1,x2,x3,x4,x5,x6,x7);
+#define log_printf8(x1,x2,x3,x4,x5,x6,x7,x8) wsprintf(log_text,x1,x2,x3,x4,x5,x6,x7,x8);
 extern int log_dolog;
 extern char g_log_file[1024];
 #else