diff --git a/Util/BuildTools/Ad-rss.sh b/Util/BuildTools/Ad-rss.sh
index ae36f5b0f..9c6bfecd1 100755
--- a/Util/BuildTools/Ad-rss.sh
+++ b/Util/BuildTools/Ad-rss.sh
@@ -78,7 +78,7 @@ fi
 # ==============================================================================
 ADRSS_INSTALL_DIR="${CARLA_BUILD_FOLDER}/${ADRSS_BASENAME}/install"
 
-CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | grep -o -E "[[:digit:]]+.[[:digit:]]+.[[:digit:]]+")")
+CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | sed -r 's/^([^.]+).*$/\1/; s/^[^0-9]*([0-9]+).*$/\1/')")
 
 if [ -z "$CARLA_LLVM_VERSION_MAJOR" ] ; then
   fatal_error "Failed to retrieve the installed version of the clang compiler."
diff --git a/Util/BuildTools/BuildOSM2ODR.sh b/Util/BuildTools/BuildOSM2ODR.sh
index 1ac30f04c..b7f8e9103 100755
--- a/Util/BuildTools/BuildOSM2ODR.sh
+++ b/Util/BuildTools/BuildOSM2ODR.sh
@@ -89,7 +89,7 @@ if ${BUILD_OSM2ODR} ; then
   mkdir -p ${OSM2ODR_BUILD_FOLDER}
   cd ${OSM2ODR_BUILD_FOLDER}
 
-  CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | grep -o -E "[[:digit:]]+.[[:digit:]]+.[[:digit:]]+")")
+  CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | sed -r 's/^([^.]+).*$/\1/; s/^[^0-9]*([0-9]+).*$/\1/')")
   
   if [ -z "$CARLA_LLVM_VERSION_MAJOR" ] ; then
     fatal_error "Failed to retrieve the installed version of the clang compiler."
diff --git a/Util/BuildTools/BuildPythonAPI.sh b/Util/BuildTools/BuildPythonAPI.sh
index 36e4d4658..16e288ea2 100755
--- a/Util/BuildTools/BuildPythonAPI.sh
+++ b/Util/BuildTools/BuildPythonAPI.sh
@@ -48,7 +48,7 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
-CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | grep -o -E "[[:digit:]]+.[[:digit:]]+.[[:digit:]]+")")
+CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | sed -r 's/^([^.]+).*$/\1/; s/^[^0-9]*([0-9]+).*$/\1/')")
 
 if [ -z "$CARLA_LLVM_VERSION_MAJOR" ] ; then
   fatal_error "Failed to retrieve the installed version of the clang compiler."
diff --git a/Util/BuildTools/Setup.sh b/Util/BuildTools/Setup.sh
index 8a8312999..3d78da477 100755
--- a/Util/BuildTools/Setup.sh
+++ b/Util/BuildTools/Setup.sh
@@ -37,7 +37,7 @@ done
 # -- Set up environment --------------------------------------------------------
 # ==============================================================================
 
-CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | grep -o -E "[[:digit:]]+.[[:digit:]]+.[[:digit:]]+")")
+CARLA_LLVM_VERSION_MAJOR=$(cut -d'.' -f1 <<<"$(clang --version | head -n 1 | sed -r 's/^([^.]+).*$/\1/; s/^[^0-9]*([0-9]+).*$/\1/')")
 
 if [ -z "$CARLA_LLVM_VERSION_MAJOR" ] ; then
   fatal_error "Failed to retrieve the installed version of the clang compiler."