diff --git a/variants/rak3401/fix_bsec_lib.py b/variants/rak3401/fix_bsec_lib.py
new file mode 100644
index 0000000000..605ff1187f
--- /dev/null
+++ b/variants/rak3401/fix_bsec_lib.py
@@ -0,0 +1,15 @@
+Import('env')
+import os
+
+# Bosch has a goof in their PlatformIO packaging making linking fail.
+# The BSEC library's extra_script.py selects cortex-m4/libalgobsec.a (soft-float ABI).
+# nRF52840 compiles with -mfloat-abi=hard, requiring the fpv4-sp-d16-hard blob.
+# Workaround to prepend the hard-float path so the linker finds it before the 
+# soft-float one.
+bsec_hard = os.path.join(
+    env.subst('$PROJECT_DIR'),
+    '.pio', 'libdeps', env.subst('$PIOENV'),
+    'BSEC Software Library', 'src',
+    'cortex-m4', 'fpv4-sp-d16-hard'
+)
+env.Prepend(LIBPATH=[bsec_hard])
\ No newline at end of file
diff --git a/variants/rak3401/platformio.ini b/variants/rak3401/platformio.ini
index 20a8a548b9..15c7782027 100644
--- a/variants/rak3401/platformio.ini
+++ b/variants/rak3401/platformio.ini
@@ -2,17 +2,26 @@
 extends = nrf52_base
 board = rak3401
 board_check = true
+extra_scripts = ${nrf52_base.extra_scripts}
+  post:variants/rak3401/fix_bsec_lib.py
 build_flags = ${nrf52_base.build_flags}
   ${sensor_base.build_flags}
   -I variants/rak3401
   -D RAK_3401
   -D NRF52_POWER_MANAGEMENT
+  -D PIN_BOARD_SCL=14
+  -D PIN_BOARD_SDA=13
+  -D PIN_GPS_TX=PIN_SERIAL1_RX
+  -D PIN_GPS_RX=PIN_SERIAL1_TX
   -D RADIO_CLASS=CustomSX1262
   -D WRAPPER_CLASS=CustomSX1262Wrapper
   -D LORA_TX_POWER=22
   -D SX126X_CURRENT_LIMIT=140
   -D SX126X_RX_BOOSTED_GAIN=1
   -D SX126X_REGISTER_PATCH=1       ; Patch register 0x8B5 for improved RX with SKY66122 FEM
+  -D ENV_INCLUDE_RAK12035=1
+  -UENV_INCLUDE_BME680
+  -D ENV_INCLUDE_BME680_BSEC=1
 build_src_filter = ${nrf52_base.build_src_filter}
   +<../variants/rak3401>
   +<helpers/sensors>
@@ -23,6 +32,7 @@ lib_deps =
   ${sensor_base.lib_deps}
   adafruit/Adafruit SSD1306 @ ^2.5.13
   sparkfun/SparkFun u-blox GNSS Arduino Library@^2.2.27
+  boschsensortec/BSEC Software Library @ ^1.8.1492
 
 [env:RAK_3401_repeater]
 extends = rak3401