https://github.com/brezerk/q4wine/issues/39

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index adb8db6..7c0d0d2 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -275,7 +275,7 @@ SET ( Q4WINE_HEADERS_DIR
 
 IF (${WITH_SYSTEM_SINGLEAPP} MATCHES ON )
     MESSAGE(STATUS "Searching for QtSingleApplication package (WITH_SYSTEM_SINGLEAPP=ON) --\n")
-    find_path(QTSINGLEAPPLIB_INCLUDE_DIR QtSingleApplication PATH_SUFFIXES QtSolutions)
+    find_path(QTSINGLEAPPLIB_INCLUDE_DIR QtSingleApplication PATH_SUFFIXES QtSolutions PATHS /usr/include/qt4)
     find_library(QTSINGLEAPPLIB QtSolutions_SingleApplication-2.6)
 
     IF (QTSINGLEAPPLIB_INCLUDE_DIR AND QTSINGLEAPPLIB )