diff --git a/src/Acid.Cam.v2.OpenCV3.Linux.pro b/src/Acid.Cam.v2.OpenCV3.Linux.pro
index d873831..612a2b8 100644
--- a/src/Acid.Cam.v2.OpenCV3.Linux.pro
+++ b/src/Acid.Cam.v2.OpenCV3.Linux.pro
@@ -4,7 +4,8 @@
 
 TEMPLATE = app
 TARGET = Acid_Cam_v2_Qt
-QT += core gui widgets opengl network
+QT += core gui opengl network
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 CONFIG += c++11
 DEPENDPATH += .
 INCLUDEPATH += . /usr/include/ /usr/local/include
diff --git a/src/Acid.Cam.v2.OpenCV3.pro b/src/Acid.Cam.v2.OpenCV3.pro
index 58a5480..d15c01c 100644
--- a/src/Acid.Cam.v2.OpenCV3.pro
+++ b/src/Acid.Cam.v2.OpenCV3.pro
@@ -4,7 +4,8 @@
 
 TEMPLATE = app
 TARGET = Acid_Cam_v2_Qt
-QT += core gui widgets opengl network
+QT += core gui opengl network
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 CONFIG += c++11
 DEPENDPATH += .
 INCLUDEPATH += . /usr/include/ /usr/local/include
diff --git a/src/Acid.Cam.v2.OpenCV4.Linux.pro b/src/Acid.Cam.v2.OpenCV4.Linux.pro
index 873dac7..a4e10b7 100644
--- a/src/Acid.Cam.v2.OpenCV4.Linux.pro
+++ b/src/Acid.Cam.v2.OpenCV4.Linux.pro
@@ -4,7 +4,8 @@
 
 TEMPLATE = app
 TARGET = Acid_Cam_v2_Qt
-QT += core gui widgets opengl network
+QT += core gui opengl network
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 CONFIG += c++11
 DEPENDPATH += .
 INCLUDEPATH += . /usr/include/ /usr/local/include
diff --git a/src/Acid.Cam.v2.OpenCV4.pro b/src/Acid.Cam.v2.OpenCV4.pro
index 58a5480..d15c01c 100644
--- a/src/Acid.Cam.v2.OpenCV4.pro
+++ b/src/Acid.Cam.v2.OpenCV4.pro
@@ -4,7 +4,8 @@
 
 TEMPLATE = app
 TARGET = Acid_Cam_v2_Qt
-QT += core gui widgets opengl network
+QT += core gui opengl network
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 CONFIG += c++11
 DEPENDPATH += .
 INCLUDEPATH += . /usr/include/ /usr/local/include