diff --git a/examples/NonArduino/Tock/CMakeLists.txt b/examples/NonArduino/Tock/CMakeLists.txt
index 8801d3194..eed0d0862 100644
--- a/examples/NonArduino/Tock/CMakeLists.txt
+++ b/examples/NonArduino/Tock/CMakeLists.txt
@@ -47,26 +47,61 @@ add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../../../../RadioLib" "${CMAKE_CUR
 add_executable(${PROJECT_NAME} main.cpp)
 
 # link with RadioLib and libtock-c
+# The build system for libtock-c is a bit odd and the version of libraries
+# built changes based on compiler version.
 if (RISCV_BUILD)
-    target_link_libraries(${PROJECT_NAME} PUBLIC
-        RadioLib
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/rv32imc/libtock.a
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/newlib/rv32/rv32i/libc.a
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/newlib/rv32/rv32i/libm.a
-    )
+    if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-13.2.0")
+        target_link_libraries(${PROJECT_NAME} PUBLIC
+            RadioLib
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/rv32imc/libtock.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-13.2.0/riscv/lib/gcc/riscv64-unknown-elf/13.2.0/rv32i/ilp32/libgcc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-13.2.0/riscv/riscv64-unknown-elf/lib/rv32i/ilp32/libstdc++.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.3.0.20230120/riscv/riscv64-unknown-elf/lib/rv32i/ilp32/libc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.3.0.20230120/riscv/riscv64-unknown-elf/lib/rv32i/ilp32/libm.a
+        )
+
+        target_include_directories(RadioLib AFTER PUBLIC
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.3.0.20230120/riscv/riscv64-unknown-elf/include/
+        )
+    else()
+        target_link_libraries(${PROJECT_NAME} PUBLIC
+            RadioLib
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/rv32imc/libtock.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-10.5.0/riscv/lib/gcc/riscv64-unknown-elf/10.5.0/rv32i/ilp32/libgcc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-10.5.0/riscv/riscv64-unknown-elf/lib/rv32i/ilp32/libstdc++.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.2.0.20211231/riscv/riscv64-unknown-elf/lib/rv32i/ilp32/libc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.2.0.20211231/riscv/riscv64-unknown-elf/lib/rv32i/ilp32/libm.a
+        )
+
+        target_include_directories(RadioLib AFTER PUBLIC
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.2.0.20211231/riscv/riscv64-unknown-elf/include/
+        )
+    endif()
 else()
-    target_link_libraries(${PROJECT_NAME} PUBLIC
-        RadioLib
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/cortex-m4/libtock.a
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libc++/cortex-m/libgcc.a
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libc++/cortex-m/libstdc++.a
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/newlib/cortex-m/v7-m/libc.a
-        ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/newlib/cortex-m/v7-m/libm.a
-    )
+    if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-13.2.0")
+        target_link_libraries(${PROJECT_NAME} PUBLIC
+            RadioLib
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/cortex-m4/libtock.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-13.2.0/arm/lib/gcc/arm-none-eabi/13.2.0/libgcc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-13.2.0/arm/arm-none-eabi/lib/libstdc++.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.3.0.20230120/arm/arm-none-eabi/lib/libc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.3.0.20230120/arm/arm-none-eabi/lib/libm.a
+        )
+    else()
+        target_link_libraries(${PROJECT_NAME} PUBLIC
+            RadioLib
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/cortex-m4/libtock.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-10.5.0/arm/lib/gcc/arm-none-eabi/10.5.0/libgcc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-libc++-10.5.0/arm/arm-none-eabi/lib/libstdc++.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.2.0.20211231/arm/arm-none-eabi/lib/libc.a
+            ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/lib/libtock-newlib-4.2.0.20211231/arm/arm-none-eabi/lib/libm.a
+        )
+    endif()
 endif()
 
 target_include_directories(${PROJECT_NAME} PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/
     ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c
 )
 
diff --git a/examples/NonArduino/Tock/README.md b/examples/NonArduino/Tock/README.md
index 6589f4791..77ee19b76 100644
--- a/examples/NonArduino/Tock/README.md
+++ b/examples/NonArduino/Tock/README.md
@@ -13,6 +13,10 @@ This has been tested on the
 but will work on any LoRa compatible Tock board (currently only the
 expLoRaBLE board).
 
+libtock-c by default is bulit for RISC-V and ARM. RadioLib is also built
+for both architectures by default. You can skip the RISC-V RadioLib build
+by setting the `SKIP_RISCV` varaible.
+
 The RadioLib example can be built with:
 
 ```shell
diff --git a/examples/NonArduino/Tock/build.sh b/examples/NonArduino/Tock/build.sh
index b3db89fc7..4f53d3849 100755
--- a/examples/NonArduino/Tock/build.sh
+++ b/examples/NonArduino/Tock/build.sh
@@ -3,9 +3,9 @@ set -e
 
 rm -rf ./build-*
 
-cd libtock-c/libtock
-make RISCV=1 -j4
-cd ../../
+cd libtock-c/examples/cxx_hello
+make -j4
+cd ../../../
 
 mkdir -p build-arm
 cd build-arm
@@ -15,13 +15,15 @@ make -j4
 
 cd ..
 
-mkdir -p build-riscv
-cd build-riscv
+if ! env | grep SKIP_RISCV; then
+	mkdir -p build-riscv
+	cd build-riscv
 
-cmake -G "CodeBlocks - Unix Makefiles" -DRISCV_BUILD=1 ..
-make -j4
+	cmake -G "CodeBlocks - Unix Makefiles" -DRISCV_BUILD=1 ..
+	make -j4 VERBOSE=1
 
-cd ..
+	cd ..
+fi
 
 elf2tab -n radio-lib --stack 4096 --app-heap 2048 --kernel-heap 2048 \
 	--kernel-major 2 --kernel-minor 1 \
diff --git a/examples/NonArduino/Tock/libtock-c b/examples/NonArduino/Tock/libtock-c
index 1c1f4c081..44bf89c54 160000
--- a/examples/NonArduino/Tock/libtock-c
+++ b/examples/NonArduino/Tock/libtock-c
@@ -1 +1 @@
-Subproject commit 1c1f4c0810aa0fbd50aa91a11aaa7c05d2abb1bc
+Subproject commit 44bf89c545953d8859faf101d4b4a4b6a151fe6c
diff --git a/src/protocols/FSK4/FSK4.cpp b/src/protocols/FSK4/FSK4.cpp
index 4fd267e66..785961dfe 100644
--- a/src/protocols/FSK4/FSK4.cpp
+++ b/src/protocols/FSK4/FSK4.cpp
@@ -1,4 +1,5 @@
 #include "FSK4.h"
+#include <stdlib.h>
 #include <math.h>
 #if !RADIOLIB_EXCLUDE_FSK4