diff --git a/depends/config.site.in b/depends/config.site.in
index 4012f5a8d..1df04eec3 100644
--- a/depends/config.site.in
+++ b/depends/config.site.in
@@ -1,84 +1,84 @@
 cross_compiling=maybe
 host_alias=@HOST@
 ac_tool_prefix=${host_alias}-
 
 if test -z $with_boost; then
   with_boost=$prefix
 fi
 if test -z $with_qt_plugindir; then
   with_qt_plugindir=$prefix/plugins
 fi
 if test -z $with_qt_translationdir; then
   with_qt_translationdir=$prefix/translations
 fi
 if test -z $with_qt_bindir; then
   with_qt_bindir=$prefix/native/bin
 fi
 if test -z $with_protoc_bindir; then
   with_protoc_bindir=$prefix/native/bin
 fi
 if test -z $with_comparison_tool; then
   with_comparison_tool=$prefix/native/share/BitcoindComparisonTool_jar/BitcoindComparisonTool.jar
 fi
 
 
 if test -z $enable_wallet && test -n "@no_wallet@"; then
   enable_wallet=no
 fi
 
 if test -z $with_miniupnpc && test -n "@no_upnp@"; then
   with_miniupnpc=no
 fi
 
 if test -z $with_gui && test -n "@no_qt@"; then
   with_gui=no
 fi
 
 if test @host_os@ == darwin; then
   BREW=no
   PORT=no
 fi
 
 if test @host_os@ == mingw32; then
   if test -z $with_qt_incdir; then
     with_qt_incdir=$prefix/include
   fi
   if test -z $with_qt_libdir; then
     with_qt_libdir=$prefix/lib
   fi
 fi
 
 export PATH=$prefix/native/bin:$PATH
 export PKG_CONFIG="`which pkg-config` --static"
 export PKG_CONFIG_LIBDIR=$prefix/lib/pkgconfig
 export PKG_CONFIG_PATH=$prefix/share/pkgconfig
-export CPPFLAGS=-I$prefix/include/
+export CPPFLAGS="-I$prefix/include/ $CPPFLAGS"
 
 export CC="@CC@"
 export CXX="@CXX@"
 export OBJC="${CC}"
 export OBJCXX="${CXX}"
 export CCACHE=$prefix/native/bin/ccache
 
 if test -n "@AR@"; then
   export AR=@AR@
   ac_cv_path_ac_pt_AR=${AR}
 fi
 
 if test -n "@RANLIB@"; then
   export RANLIB=@RANLIB@
   ac_cv_path_ac_pt_RANLIB=${RANLIB}
 fi
 
 if test -n "@NM@"; then
   export NM=@NM@
   ac_cv_path_ac_pt_NM=${NM}
 fi
 
 if test -n "@CFLAGS@"; then
   export CFLAGS="@CFLAGS@ $CFLAGS"
 fi
 if test -n "@CXXFLAGS@"; then
   export CXXFLAGS="@CXXFLAGS@ $CXXFLAGS"
 fi
 export LDFLAGS="-L$prefix/lib @LDFLAGS@ $LDFLAGS"