diff --git a/apps/codecs/libfaad/codebook/hcb.h b/apps/codecs/libfaad/codebook/hcb.h
index eaefdbf..8619d88 100644
--- a/apps/codecs/libfaad/codebook/hcb.h
+++ b/apps/codecs/libfaad/codebook/hcb.h
@@ -122,18 +122,18 @@ int hcb_2_quad_table_size[];
 int hcb_2_pair_table_size[];
 int hcb_bin_table_size[];
 
-#include "codebook/hcb_1.h"
-#include "codebook/hcb_2.h"
-#include "codebook/hcb_3.h"
-#include "codebook/hcb_4.h"
-#include "codebook/hcb_5.h"
-#include "codebook/hcb_6.h"
-#include "codebook/hcb_7.h"
-#include "codebook/hcb_8.h"
-#include "codebook/hcb_9.h"
-#include "codebook/hcb_10.h"
-#include "codebook/hcb_11.h"
-#include "codebook/hcb_sf.h"
+#include "../codebook/hcb_1.h"
+#include "../codebook/hcb_2.h"
+#include "../codebook/hcb_3.h"
+#include "../codebook/hcb_4.h"
+#include "../codebook/hcb_5.h"
+#include "../codebook/hcb_6.h"
+#include "../codebook/hcb_7.h"
+#include "../codebook/hcb_8.h"
+#include "../codebook/hcb_9.h"
+#include "../codebook/hcb_10.h"
+#include "../codebook/hcb_11.h"
+#include "../codebook/hcb_sf.h"
 
 
 #ifdef __cplusplus
diff --git a/tools/ovl_offset.pl b/tools/ovl_offset.pl
index 89c3468..01b70de 100755
--- a/tools/ovl_offset.pl
+++ b/tools/ovl_offset.pl
@@ -8,7 +8,7 @@ sub map_scan {
     my $ramstart = -1, $ramsize = -1, $startaddr = -1, $endaddr = -1;
     open (MAP, "<$map");
     while (<MAP>) {
-        if ($_ =~ /^PLUGIN_RAM +0x([0-9a-f]+) +0x([0-9a-f]+)$/) {
+        if ($_ =~ /^PLUGIN_RAM +0x([0-9a-f]+) +0x([0-9a-f]+)/) {
             $ramstart = hex($1);
             $ramsize = hex($2);
         }
diff --git a/tools/rockboxdev.sh b/tools/rockboxdev.sh
index 595a26a..cfc589f 100755
--- a/tools/rockboxdev.sh
+++ b/tools/rockboxdev.sh
@@ -236,7 +236,14 @@ gccurl="http://www.rockbox.org/gcc"
 case $arch in
   [Ss])
     target="sh-elf"
-    gccpatch="gcc-4.0.3-rockbox-1.diff"
+    case $system in
+      MINGW*)
+        gccpatch="gcc-4.0.3-rockbox-1-mingw.diff"
+        ;;
+      *)
+        gccpatch="gcc-4.0.3-rockbox-1.diff"
+        ;;
+    esac
     ;;
   [Mm])
     target="m68k-elf"
@@ -253,13 +260,23 @@ case $arch in
             ;;
         esac
         ;;
+      MINGW*)
+        gccpatch="gcc-3.4.6-mingw.patch"
+        ;;
       *)
         ;;
     esac
     ;;
   [Aa])
     target="arm-elf"
-    gccpatch="rockbox-multilibs-arm-elf-gcc-4.0.3_2.diff"
+    case $system in
+      MINGW*)
+        gccpatch="rockbox-multilibs-arm-elf-gcc-4.0.3_2-mingw.diff"
+        ;;
+      *)
+        gccpatch="rockbox-multilibs-arm-elf-gcc-4.0.3_2.diff"
+        ;;
+    esac
     ;;
   [Ii])
     target="mipsel-elf"
@@ -272,6 +289,9 @@ case $arch in
       Interix)
         gccpatch="gcc-4.1.2-interix.diff"
         ;;
+      MINGW*)
+        gccpatch="gcc-4.1.2-mingw.diff"
+        ;;
       *)
         ;;
     esac
@@ -282,6 +302,13 @@ case $arch in
     ;;
 esac
 
+# When gcc build on MinGW, "ln -s" does not use.
+case $arch in
+  MINGW*)
+    export ac_cv_prog_LN_S=ln
+    ;;
+esac
+
 bindir="$prefix/$target/bin"
 if test -n $pathadd; then
   pathadd="$pathadd:$bindir"
diff --git a/tools/root.make b/tools/root.make
index 49f6a7f..1c2fcb1 100644
--- a/tools/root.make
+++ b/tools/root.make
@@ -93,7 +93,10 @@ tools: $(TOOLS)
 -include $(DEPFILE)
 
 veryclean: clean
-	$(SILENT)rm -rf $(TOOLS)
+	$(SILENT)case `uname` in \
+	  MINGW*) rm -rf $(TOOLS:=.exe) ;; \
+	  *)      rm -rf $(TOOLS) ;; \
+	esac
 
 clean:
 	$(SILENT)echo Cleaning build directory