diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..bfa70c9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,10 @@
+[submodule "lib/RTKLIB"]
+	path = lib/RTKLIB
+	url = https://github.com/tomojitakasu/RTKLIB
+	branch = rtklib_2.4.3
+[submodule "lib/LDPC-codes"]
+	path = lib/LDPC-codes
+	url = https://github.com/radfordneal/LDPC-codes
+[submodule "lib/libfec"]
+	path = lib/libfec
+	url = https://github.com/quiet/libfec.git
diff --git a/README.md b/README.md
index 8a0fddb..7cc36c4 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,10 @@ PocketSDR --+-- bin     Pocket SDR utilities and APs binary programs for Windows
 ```
     $ sudo apt install libfftw3-dev
 ```
+* Download the content of the libs submodules
+```
+$ git submodule update --init --recursive
+```
 * Move to the library directory, build libraries.
 ```
     $ cd <install_dir>/lib/build
diff --git a/lib/LDPC-codes b/lib/LDPC-codes
new file mode 160000
index 0000000..74a8e28
--- /dev/null
+++ b/lib/LDPC-codes
@@ -0,0 +1 @@
+Subproject commit 74a8e283be8259dbff7a6bab38ad7e9327825cbf
diff --git a/lib/RTKLIB b/lib/RTKLIB
new file mode 160000
index 0000000..180043e
--- /dev/null
+++ b/lib/RTKLIB
@@ -0,0 +1 @@
+Subproject commit 180043ee24b6d2b168f98b64be15f69d50046b1a
diff --git a/lib/libfec b/lib/libfec
new file mode 160000
index 0000000..9750ca0
--- /dev/null
+++ b/lib/libfec
@@ -0,0 +1 @@
+Subproject commit 9750ca0a6d0a786b506e44692776b541f90daa91