diff --git a/src/designer/qmake.pro.in b/src/designer/qmake.pro.in
index 7339393..ed79448 100644
--- a/src/designer/qmake.pro.in
+++ b/src/designer/qmake.pro.in
@@ -29,6 +29,7 @@ macx {
 win32 {
   QMAKE_LIBS += -lwinhttp -lgdi32 -lws2_32
   QMAKE_LIBS += /opt/local/i586-mingw32msvc/lib/winscard.a
+  QMAKE_INCDIR += /opt/local/i586-mingw32msvc/include
   QMAKE_LIBDIR += /opt/local/i586-mingw32msvc/lib
   CONFIG += dll
 }
diff --git a/src/qbrowserlib/qmake.pro.in b/src/qbrowserlib/qmake.pro.in
index d8bc00e..564fa6a 100644
--- a/src/qbrowserlib/qmake.pro.in
+++ b/src/qbrowserlib/qmake.pro.in
@@ -24,6 +24,7 @@ macx {
 win32 {
   QMAKE_LIBS += -lwinhttp -lgdi32 -lws2_32
   QMAKE_LIBS += /opt/local/i586-mingw32msvc/lib/winscard.a
+  QMAKE_INCDIR += /opt/local/i586-mingw32msvc/include
   QMAKE_LIBDIR += /opt/local/i586-mingw32msvc/lib
   CONFIG += release dll
 }
diff --git a/src/qmake.pro.in b/src/qmake.pro.in
index ecf1895..b7ac5af 100644
--- a/src/qmake.pro.in
+++ b/src/qmake.pro.in
@@ -26,6 +26,7 @@ macx {
 win32 {
   QMAKE_LIBS += -lwinhttp -lgdi32 -lws2_32
   QMAKE_LIBS += /opt/local/i586-mingw32msvc/lib/winscard.a
+  QMAKE_INCDIR += /opt/local/i586-mingw32msvc/include
   QMAKE_LIBDIR += /opt/local/i586-mingw32msvc/lib
   CONFIG += release
 }