diff --git a/etc/tools/ThirdPartyFunctions b/etc/tools/ThirdPartyFunctions
index 4e468ed..df5a22e 100644
--- a/etc/tools/ThirdPartyFunctions
+++ b/etc/tools/ThirdPartyFunctions
@@ -20,9 +20,12 @@
 #------------------------------------------------------------------------------
 
 # The normal locations for source, build and installation (prefix-dir)
-sourceBASE=$WM_THIRD_PARTY_DIR
-buildBASE=$WM_THIRD_PARTY_DIR/build/$WM_ARCH$WM_COMPILER
-installBASE=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER
+sourceBASE="$WM_THIRD_PARTY_DIR"
+buildBASE="$WM_THIRD_PARTY_DIR/build/$WM_ARCH$WM_COMPILER"
+installBASE="$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER"
+
+# Synthetic value combining precision and label size (Eg, DPInt32)
+WM_SIZE_OPTIONS="${WM_PRECISION_OPTION}Int${WM_LABEL_SIZE}"
 
 # Dynamic library endings (default is .so)
 [ "$(uname -s)" = Darwin ] && SO=dylib || SO=so
@@ -116,29 +119,32 @@ whichMpicxx()
     echo "${mpicxx:-mpicxx}"
 }
 
-# The presence of wmkdep etc required for building with wmake
+# Require wmkdepend etc when building with wmake
 requireWMakeToolchain()
 {
-    local dir="${WM_DIR:-$WM_PROJECT_DIR/wmake}"
-    local src="$dir/src"
-    local bin="$dir/platforms/$WM_ARCH$WM_COMPILER/wmkdep"
+    local wmDir="${WM_DIR:-$WM_PROJECT_DIR/wmake}"
+    local archDir="$wmDir/platforms/$WM_ARCH$WM_COMPILER"
 
-    test -x $bin || {
-        echo "Warning: the 'wmkdep' binary is missing - attempting to build it"
-        ( cd $src && make -s )
-    }
+    if [ -x "$archDir/wmkdepend" ] || [ -x "$archDir/wmkdep" ]
+    then
+        echo "Appear to have {wmkdepend,wmkdep} binary" 1>&2
+    else
+        echo "Warning: appear to be missing {wmkdepend,wmkdep} binary ... building" 1>&2
+        ( cd "$wmDir/src" && make -s )
 
-    test -x $bin || {
-        exec 1>&2
-        echo
-        echo "Error: cannot use wmake build for '${0##*/}"
-        echo "    The 'wmkdep' binary is missing"
-        echo "    Please run the top-level OpenFOAM Allwmake first"
-        echo
-        exit 1
-    }
+        [ -x "$archDir/wmkdepend" ] || [ -x "$archDir/wmkdep" ] || {
+            exec 1>&2
+            echo
+            echo "Error: cannot use wmake build for '${0##*/}"
+            echo "    Missing {wmkdepend,wmkdep} binary"
+            echo "    Please try run the top-level OpenFOAM Allwmake first"
+            echo
+            exit 1
+        }
+    fi
 }
 
+
 #------------------------------------------------------------------------------
 # Some functions as per OpenFOAM etc/config.sh/functions
 
@@ -189,9 +195,7 @@ setBuildSuffix()
 #
 unset WM_HOSTS WM_SCHEDULER
 
-WM_NCOMPPROCS=$(egrep -c "^processor" /proc/cpuinfo 2>/dev/null) || \
-WM_NCOMPPROCS=$(getconf _NPROCESSORS_ONLN 2>/dev/null) || \
-WM_NCOMPPROCS=1
+WM_NCOMPPROCS=$(getconf _NPROCESSORS_ONLN 2>/dev/null) || WM_NCOMPPROCS=1
 : ${WM_NCOMPPROCS:=1}
 export WM_NCOMPPROCS
 
diff --git a/makeHYPRE b/makeHYPRE
index b8f3dcc..c125cb2 100755
--- a/makeHYPRE
+++ b/makeHYPRE
@@ -130,7 +130,7 @@ fi
 #   HYPRE_SOURCE_DIR : location of the original sources
 
 HYPRE_SOURCE_DIR=$sourceBASE/$hyprePACKAGE
-: ${HYPRE_ARCH_PATH:=$installBASE$WM_PRECISION_OPTION$WM_LABEL_OPTION/$hyprePACKAGE}
+: ${HYPRE_ARCH_PATH:=$installBASE$WM_SIZE_OPTIONS/$hyprePACKAGE}
 
 [ -d "$HYPRE_SOURCE_DIR" ] || {
     echo "Missing sources: '$hyprePACKAGE'"
diff --git a/makeMETIS b/makeMETIS
index 0011ead..103a8f6 100755
--- a/makeMETIS
+++ b/makeMETIS
@@ -130,7 +130,7 @@ fi
 #   METIS_SOURCE_DIR : location of the original sources
 
 METIS_SOURCE_DIR=$sourceBASE/$metisPACKAGE
-: ${METIS_ARCH_PATH:=$installBASE$WM_PRECISION_OPTION$WM_LABEL_OPTION/$metisPACKAGE}
+: ${METIS_ARCH_PATH:=$installBASE$WM_SIZE_OPTIONS/$metisPACKAGE}
 
 [ -d "$METIS_SOURCE_DIR" ] || {
     echo "Missing sources: '$metisPACKAGE'"
diff --git a/makeMGridGen b/makeMGridGen
index 711fce6..bb048cc 100755
--- a/makeMGridGen
+++ b/makeMGridGen
@@ -96,7 +96,7 @@ fi
 #   MGRIDGEN_ARCH_PATH  : installation directory
 
 MGRIDGEN_SOURCE_DIR=$WM_THIRD_PARTY_DIR/$mgridgenPACKAGE
-MGRIDGEN_ARCH_PATH=$installBASE$WM_PRECISION_OPTION$WM_LABEL_OPTION/$mgridgenPACKAGE
+MGRIDGEN_ARCH_PATH=$installBASE$WM_SIZE_OPTIONS/$mgridgenPACKAGE
 
 : ${FOAM_MPI:=dummy}
 
diff --git a/makePETSC b/makePETSC
index 6b86ec0..e362cd8 100755
--- a/makePETSC
+++ b/makePETSC
@@ -130,7 +130,7 @@ fi
 #   PETSC_SOURCE_DIR : location of the original sources
 
 PETSC_SOURCE_DIR=$sourceBASE/$petscPACKAGE
-: ${PETSC_ARCH_PATH:=$installBASE$WM_PRECISION_OPTION$WM_LABEL_OPTION/$petscPACKAGE}
+: ${PETSC_ARCH_PATH:=$installBASE$WM_SIZE_OPTIONS/$petscPACKAGE}
 
 [ -d "$PETSC_SOURCE_DIR" ] || {
     echo "Missing sources: '$petscPACKAGE'"
@@ -141,8 +141,8 @@ PETSC_SOURCE_DIR=$sourceBASE/$petscPACKAGE
 echo "Starting build: $petscPACKAGE ($targetType)"
 echo
 (
-    # PETSC arch
-    archOpt="${WM_PRECISION_OPTION}Int$WM_LABEL_SIZE"
+    # PETSC arch - same root as WM_OPTIONS (eg, DPInt32)
+    archOpt="$WM_SIZE_OPTIONS"
 
     # Configuration options:
     configOpt="--with-cc=$(whichMpicc) --with-cxx=$(whichMpicxx)"
@@ -181,9 +181,9 @@ echo
        --download-f2cblaslapack=1 \
        $configOpt \
      && echo "Configured: petsc" \
-     && make PETSC_DIR=$PETSC_SOURCE_DIR PETSC_ARCH=$archOpt all \
+     && make PETSC_DIR=$PETSC_SOURCE_DIR PETSC_ARCH="$archOpt" all \
      && echo "Built: petsc" \
-     && make PETSC_DIR=$PETSC_SOURCE_DIR PETSC_ARCH=$archOpt install
+     && make PETSC_DIR=$PETSC_SOURCE_DIR PETSC_ARCH="$archOpt" install
      && echo "Installed: petsc"
 ) || {
     echo "Error building: petsc"