diff --git a/installation/docker/docker_base/install_fortran.sh b/installation/docker/docker_base/install_fortran.sh
index 2b92e14..92d475e 100755
--- a/installation/docker/docker_base/install_fortran.sh
+++ b/installation/docker/docker_base/install_fortran.sh
@@ -41,8 +41,8 @@ apt --yes install gnuplot
 ## INSTALL THE TOOLBOX
 
 # compile the toolbox
-gfortran -c -Werror -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./toolbox.f90 -o toolbox.o
 
 # copy the toolbox to the working directory
 mkdir -p /usr/local/include
diff --git a/installation/docker/docker_vnc/install_fortran.sh b/installation/docker/docker_vnc/install_fortran.sh
index e68f756..6a9662a 100755
--- a/installation/docker/docker_vnc/install_fortran.sh
+++ b/installation/docker/docker_vnc/install_fortran.sh
@@ -79,8 +79,8 @@ mv ./geany.conf /root/.config/geany/geany.conf
 ## INSTALL THE TOOLBOX
 
 # compile the toolbox
-gfortran -c -Werror -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./toolbox.f90 -o toolbox.o
 
 # copy the toolbox to the working directory
 mkdir -p /usr/local/include
diff --git a/installation/mac/install_fortran.command b/installation/mac/install_fortran.command
index d50c7d0..754822a 100755
--- a/installation/mac/install_fortran.command
+++ b/installation/mac/install_fortran.command
@@ -72,8 +72,8 @@ sudo mv ./geany.conf ~/.config/geany/geany.conf
 ## INSTALL THE TOOLBOX
 
 # compile the toolbox
-gfortran -c -Werror -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
 
 # copy the toolbox to the working directory
 sudo mkdir -p /usr/local/include
diff --git a/installation/mac/update_toolbox.command b/installation/mac/update_toolbox.command
index 57d6e6e..09ccbbf 100755
--- a/installation/mac/update_toolbox.command
+++ b/installation/mac/update_toolbox.command
@@ -31,8 +31,8 @@ fi
 ## INSTALL THE TOOLBOX
 
 # compile the toolbox
-gfortran -c -Werror -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused  -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
 
 # copy the toolbox to the working directory
 sudo mkdir -p /usr/local/include
diff --git a/installation/ubuntu/install_fortran.sh b/installation/ubuntu/install_fortran.sh
index 6fd1f77..28fe050 100755
--- a/installation/ubuntu/install_fortran.sh
+++ b/installation/ubuntu/install_fortran.sh
@@ -89,8 +89,8 @@ sudo chown $USER:$USER -c ~/Desktop/geany.desktop
 ## INSTALL THE TOOLBOX
 
 # compile the toolbox
-gfortran -c -Werror -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
 
 # copy the toolbox to the working directory
 sudo sudo mkdir -p /usr/local/include
diff --git a/installation/ubuntu/update_toolbox.sh b/installation/ubuntu/update_toolbox.sh
index 7147918..4cc1a4c 100755
--- a/installation/ubuntu/update_toolbox.sh
+++ b/installation/ubuntu/update_toolbox.sh
@@ -37,8 +37,8 @@ fi
 ## INSTALL THE TOOLBOX
 
 # compile the toolbox
-gfortran -c -Werror -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
 
 # copy the toolbox to the working directory
 sudo mkdir -p /usr/local/include
diff --git a/installation/windows/install_fortran.bat b/installation/windows/install_fortran.bat
index 6c0ff37..bad34b7 100644
--- a/installation/windows/install_fortran.bat
+++ b/installation/windows/install_fortran.bat
@@ -154,8 +154,8 @@ move geany.conf "%userprofile%\AppData\Roaming\geany\geany.conf"
 
 :: INSTALL THE TOOLBOX
 
-gfortran -c -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../../toolbox/toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./../../toolbox/toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused  -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../../toolbox/toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./../../toolbox/toolbox.f90 -o toolbox.o
 mkdir "%location%\include\" 2>nul
 del /Q "%location%\include\toolbox.mod" 2>nul
 del /Q "%location%\include\toolbox.o" 2>nul
diff --git a/installation/windows/update_toolbox.bat b/installation/windows/update_toolbox.bat
index cc81913..c5b4cac 100644
--- a/installation/windows/update_toolbox.bat
+++ b/installation/windows/update_toolbox.bat
@@ -55,8 +55,8 @@ if %exitres%==T exit
 
 
 :: INSTALL THE TOOLBOX
-gfortran -c -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
-gfortran -c -O3 -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
+gfortran -c -Werror -fopenmp -Wno-unused -ffree-line-length-none -fimplicit-none -Wall -fcheck=bound,do -ffpe-trap=invalid,zero,overflow -frecursive -g ./../toolbox/toolbox.f90 -o toolbox_debug.o
+gfortran -c -O3 -fopenmp -ffree-line-length-none ./../toolbox/toolbox.f90 -o toolbox.o
 mkdir "%location%\include\" 2>nul
 del /Q "%location%\include\toolbox.mod" 2>nul
 del /Q "%location%\include\toolbox.o" 2>nul