diff --git a/README.md b/README.md
index e32ad25..dbd9469 100644
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ Path to a directory (`userland`) of [Source code for a C-based firmware patching
 ##### `ENABLE_NEXMON`=false
 Install and enable the [Source code for a C-based firmware patching framework for Broadcom/Cypress WiFi chips that enables you to write your own firmware patches, for example, to enable monitor mode with radiotap headers and frame injection](https://github.com/seemoo-lab/nexmon.git).
 
-##### `NEXMON_DIR`=""
+##### `NEXMONSRC_DIR`=""
 Path to a directory (`nexmon`) of [Source code for ARM side libraries for interfacing to Raspberry Pi GPU](https://github.com/raspberrypi/userland) that will be copied, configured, build and installed inside the chroot.
 
 ##### `ENABLE_IPTABLES`=false
diff --git a/bootstrap.d/13-kernel.sh b/bootstrap.d/13-kernel.sh
index b669013..a14c8fc 100644
--- a/bootstrap.d/13-kernel.sh
+++ b/bootstrap.d/13-kernel.sh
@@ -32,8 +32,7 @@ if [ "$BUILD_KERNEL" = true ] ; then
       else
         as_nobody -H git -C "${temp_dir}" clone --depth=1 --branch "${KERNEL_BRANCH}" "${KERNEL_URL}" linux
       fi
-	fi
-
+    fi
     # Copy downloaded kernel sources
     cp -r "${temp_dir}/linux/"* "${KERNEL_DIR}"
 
diff --git a/bootstrap.d/15-rpi-config.sh b/bootstrap.d/15-rpi-config.sh
index 5e33831..40c7ada 100644
--- a/bootstrap.d/15-rpi-config.sh
+++ b/bootstrap.d/15-rpi-config.sh
@@ -5,7 +5,7 @@
 # Load utility functions
 . ./functions.sh
 
-if [ "$BUILD_KERNEL" = true ] ; then
+#if [ "$BUILD_KERNEL" = true ] ; then
   if [ -n "$RPI_FIRMWARE_DIR" ] && [ -d "$RPI_FIRMWARE_DIR" ] ; then
     # Install boot binaries from local directory
     cp "${RPI_FIRMWARE_DIR}"/boot/bootcode.bin "${BOOT_DIR}"/bootcode.bin
@@ -38,7 +38,7 @@ if [ "$BUILD_KERNEL" = true ] ; then
     chown -R root:root "${BOOT_DIR}"
     chmod -R 600 "${BOOT_DIR}"
   fi
-fi
+#fi
 
 # Setup firmware boot cmdline
 if [ "$ENABLE_UBOOTUSB" = true ] ; then
diff --git a/bootstrap.d/44-nexmon_monitor_patch.sh b/bootstrap.d/44-nexmon_monitor_patch.sh
index aa37ef0..8e2984f 100644
--- a/bootstrap.d/44-nexmon_monitor_patch.sh
+++ b/bootstrap.d/44-nexmon_monitor_patch.sh
@@ -7,28 +7,39 @@
 . ./functions.sh
 
 if [ "$ENABLE_NEXMON" = true ] && [ "$ENABLE_WIRELESS" = true ]; then
+  # Copy existing nexmon sources into chroot directory
+  if [ -n "$NEXMONSRC_DIR" ] && [ -d "$NEXMONSRC_DIR" ] ; then
+    # Copy local U-Boot sources
+    cp -r "${NEXMONSRC_DIR}" "${R}/tmp"
+  else
+    # Create temporary directory for nexmon sources
+    temp_dir=$(as_nobody mktemp -d)
 
-  # Create temporary directory for nexmon sources
-  temp_dir=$(as_nobody mktemp -d)
+    # Fetch nexmon sources
+    as_nobody git -C "${temp_dir}" clone "${NEXMON_URL}"
 
-  # Fetch nexmon sources
-  as_nobody git -C "${temp_dir}" clone "${NEXMON_URL}"
+    # Copy downloaded nexmon sources
+    mv "${temp_dir}/nexmon" "${R}"/tmp/
 
-  # Copy downloaded nexmon sources
-  mv "${temp_dir}/nexmon" "${R}"/tmp/
+    # Set permissions of the nexmon sources
+    chown -R root:root "${R}"/tmp/nexmon
 
-  # Set permissions of the nexmon sources
-  chown -R root:root "${R}"/tmp/nexmon
-  
+    # Remove temporary directory for nexmon sources
+    rm -fr "${temp_dir}"
+  fi
+	
   # Set script Root
   export NEXMON_ROOT="${R}"/tmp/nexmon
 
-  # Remove temporary directory for nexmon sources
-  rm -fr "${temp_dir}"
-
   # Build nexmon firmware outside the build system, if we can.
   cd "${NEXMON_ROOT}" || exit
   
+  # Make ancient isl build
+  cd buildtools/isl-0.10 || exit
+  CC="${CC}"gcc
+  ./configure
+  make
+  
   # Disable statistics
   touch DISABLE_STATISTICS
   
@@ -49,12 +60,6 @@ if [ "$ENABLE_NEXMON" = true ] && [ "$ENABLE_WIRELESS" = true ]; then
   
   # Make nexmon
   make
-
-  # Make ancient isl build
-  cd buildtools/isl-0.10 || exit
-  CC="${CC}"gcc
-  ./configure
-  make
   
   # Backup stock broadcom wlan driver - "${LIB_DIR}"/modules/${KERNEL_VERSION}/kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko
   brcmfmac_path=$(modinfo brcmfmac | grep -m 1 -oP "^filename:(\s*?)(.*)$" | sed -e 's/^filename:\(\s*\)\(.*\)$/\2/g')
diff --git a/rpi23-gen-image.sh b/rpi23-gen-image.sh
index 2529d28..27dec1c 100755
--- a/rpi23-gen-image.sh
+++ b/rpi23-gen-image.sh
@@ -159,7 +159,7 @@ ENABLE_VIDEOCORE=${ENABLE_VIDEOCORE:=false}
 ENABLE_NEXMON=${ENABLE_NEXMON:=false}
 VIDEOCORESRC_DIR=${VIDEOCORESRC_DIR:=""}
 FBTURBOSRC_DIR=${FBTURBOSRC_DIR:=""}
-NEXMON_DIR=${NEXMON_DIR:=""}
+NEXMONSRC_DIR=${NEXMONSRC_DIR:=""}
 ENABLE_HARDNET=${ENABLE_HARDNET:=false}
 ENABLE_IPTABLES=${ENABLE_IPTABLES:=false}
 ENABLE_SPLITFS=${ENABLE_SPLITFS:=false}
@@ -372,6 +372,11 @@ if [ "$ENABLE_VIDEOCORE" = true ] ; then
   REQUIRED_PACKAGES="${REQUIRED_PACKAGES} cmake"
 fi
 
+# Add deps for nexmon
+if [ "$ENABLE_NEXMON" = true ] ; then
+  REQUIRED_PACKAGES="${REQUIRED_PACKAGES},libgmp3-dev,gawk,qpdf,bison,flex,make,autoconf,automake,build-essential,libtool"
+fi
+
 # Add libncurses5 to enable kernel menuconfig
 if [ "$KERNEL_MENUCONFIG" = true ] ; then
   REQUIRED_PACKAGES="${REQUIRED_PACKAGES} libncurses-dev"
@@ -486,9 +491,9 @@ if [ -n "$FBTURBOSRC_DIR" ] && [ ! -d "$FBTURBOSRC_DIR" ] ; then
   exit 1
 fi
 
-# Check if specified NEXMON_DIR directory exists
-if [ -n "$NEXMON_DIR" ] && [ ! -d "$NEXMON_DIR" ] ; then
-  echo "error: '${NEXMON_DIR}' specified directory not found (NEXMON_DIR)!"
+# Check if specified NEXMONSRC_DIR directory exists
+if [ -n "$NEXMONSRC_DIR" ] && [ ! -d "$NEXMONSRC_DIR" ] ; then
+  echo "error: '${NEXMONSRC_DIR}' specified directory not found (NEXMONSRC_DIR)!"
   exit 1
 fi