--- a/common/autoconf/toolchain_windows.m4	Tue Sep 09 15:12:50 2014 +0200
+++ b/common/autoconf/toolchain_windows.m4	Tue Sep 09 17:42:07 2014 +0100
@@ -33,6 +33,10 @@
       if test -f "$VS100BASE/$VCVARSFILE"; then
         AC_MSG_NOTICE([Found Visual Studio installation at $VS100BASE using $METHOD])
         VS_ENV_CMD="$VS100BASE/$VCVARSFILE"
+        # PLATFORM_TOOLSET is used during the compilation of the freetype sources (see
+        # 'LIB_BUILD_FREETYPE' in libraries.m4) and must be one of 'v100', 'v110' or 'v120' for VS 2010, 2012 or VS2013
+        # TODO: improve detection for other versions of VS
+        PLATFORM_TOOLSET="v100"
       else
         AC_MSG_NOTICE([Found Visual Studio installation at $VS100BASE using $METHOD])
         AC_MSG_NOTICE([Warning: $VCVARSFILE is missing, this is probably Visual Studio Express. Ignoring])
@@ -61,6 +65,10 @@
         else
           VS_ENV_ARGS="/x64"
         fi
+        # PLATFORM_TOOLSET is used during the compilation of the freetype sources (see
+        # 'LIB_BUILD_FREETYPE' in libraries.m4) and must be 'Windows7.1SDK' for Windows7.1SDK
+        # TODO: improve detection for other versions of SDK
+        PLATFORM_TOOLSET="Windows7.1SDK"
       else
         AC_MSG_NOTICE([Found Windows SDK installation at $WIN_SDK_BASE using $METHOD])
         AC_MSG_NOTICE([Warning: Installation is broken, SetEnv.Cmd is missing. Ignoring])