diff --git a/build_qt4.sh b/build_qt4.sh
index 6090467..08dab97 100755
--- a/build_qt4.sh
+++ b/build_qt4.sh
@@ -4,10 +4,10 @@ echo "Trying to build PE-bear..."
 
 #QT check
 
-QT_VER=`qmake -v`
+QT_VER=$(qmake -v)
 QTV="version"
 if echo "$QT_VER" | grep -q "$QTV"; then
-    QT4_FOUND=`whereis qt4`
+    QT4_FOUND=$(whereis qt4)
     if echo "$QT4_FOUND" | grep -q "lib"; then
         echo "[+] Qt4 found!"
     else
@@ -19,7 +19,7 @@ else
     exit -1
 fi
 
-CMAKE_VER=`cmake --version`
+CMAKE_VER=$(cmake --version)
 CMAKEV="cmake version"
 if echo "$CMAKE_VER" | grep -q "$CMAKEV"; then
     echo "[+] CMake found!"
diff --git a/build_qt5.sh b/build_qt5.sh
index ac93506..1474f56 100755
--- a/build_qt5.sh
+++ b/build_qt5.sh
@@ -4,15 +4,15 @@ echo "Trying to build PE-bear..."
 
 #QT check
 
-QT_VER=`qmake -v`
-str=$QT_VER
+QT_VER=$(qmake -v)
+str="$QT_VER"
 substr="Qt version 5"
 
 echo $QT_VER
 if [[ $str == *"$substr"* ]]; then
     echo "[+] Qt5 found!"
 else
-    str2=`whereis qt5`
+    str2=$(whereis qt5)
     substr2="/qt5"
     if [[ $str2 == *"$substr2"* ]]; then
         echo "[+] Qt5 found!"
@@ -23,7 +23,7 @@ else
 fi
 
 
-CMAKE_VER=`cmake --version`
+CMAKE_VER=$(cmake --version)
 CMAKEV="cmake version"
 if echo "$CMAKE_VER" | grep -q "$CMAKEV"; then
     echo "[+] CMake found!"
diff --git a/build_qt6.sh b/build_qt6.sh
index f951542..66c9018 100755
--- a/build_qt6.sh
+++ b/build_qt6.sh
@@ -4,15 +4,15 @@ echo "Trying to build PE-bear..."
 
 #QT check
 
-QT_VER=`qmake -v`
-str=$QT_VER
+QT_VER=$(qmake -v)
+str="$QT_VER"
 substr="Qt version 6"
 
 echo $QT_VER
 if [[ $str == *"$substr"* ]]; then
     echo "[+] Qt6 found!"
 else
-    str2=`whereis qt6`
+    str2=$(whereis qt6)
     substr2="/qt6"
     if [[ $str2 == *"$substr2"* ]]; then
         echo "[+] Qt6 found!"
@@ -22,8 +22,7 @@ else
     fi
 fi
 
-
-CMAKE_VER=`cmake --version`
+CMAKE_VER=$(cmake --version)
 CMAKEV="cmake version"
 if echo "$CMAKE_VER" | grep -q "$CMAKEV"; then
     echo "[+] CMake found!"