diff --git a/src/libbitdht.pro b/src/libbitdht.pro
index ad6986f..d9e5816 100644
--- a/src/libbitdht.pro
+++ b/src/libbitdht.pro
@@ -6,23 +6,10 @@ CONFIG -= qt
 TARGET = bitdht
 DESTDIR = lib
 
+!include("use_libbitdht.pri"):error("Including")
+
 QMAKE_CXXFLAGS *= -Wall -DBE_DEBUG
 
-profiling {
-	QMAKE_CXXFLAGS -= -fomit-frame-pointer
-	QMAKE_CXXFLAGS *= -pg -g -fno-omit-frame-pointer
-}
-
-release {
-	# not much here yet.
-}
-
-#CONFIG += debug
-debug {
-        QMAKE_CXXFLAGS -= -O2 -fomit-frame-pointer
-        QMAKE_CXXFLAGS *= -g -fno-omit-frame-pointer
-}
-
 # treat warnings as error for better removing
 #QMAKE_CFLAGS += -Werror
 #QMAKE_CXXFLAGS += -Werror
diff --git a/src/use_libbitdht.pri b/src/use_libbitdht.pri
new file mode 100644
index 0000000..bbaf1d4
--- /dev/null
+++ b/src/use_libbitdht.pri
@@ -0,0 +1,5 @@
+DEPENDPATH *= $$system_path($$clean_path($${PWD}/../../libbitdht/src))
+INCLUDEPATH  *= $$system_path($$clean_path($${PWD}/../../libbitdht/src))
+LIBS *= -L$$system_path($$clean_path($${OUT_PWD}/../../libbitdht/src/lib/)) -lbitdht
+
+!equals(TARGET, bitdht):PRE_TARGETDEPS *= $$system_path($$clean_path($${OUT_PWD}/../../libbitdht/src/lib/libbitdht.a))