diff --git a/etc/settings.csh b/etc/settings.csh
index 058e7860ee..4c62006177 100644
--- a/etc/settings.csh
+++ b/etc/settings.csh
@@ -97,9 +97,6 @@ case OpenFOAM:
         _foamAddLib $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH/mpfr-2.4.1/lib
         _foamAddLib $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH/gmp-4.2.4/lib
     breaksw
-    case Gcc42:
-        setenv WM_COMPILER_DIR $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH/gcc-4.2.4
-    breaksw
     endsw
 
     # Check that the compiler directory can be found
@@ -123,12 +120,11 @@ endsw
 # Communications library
 # ~~~~~~~~~~~~~~~~~~~~~~
 
-unsetenv MPI_ARCH_PATH
+unsetenv MPI_ARCH_PATH MPI_HOME
 
 switch ("$WM_MPLIB")
 case OPENMPI:
     set mpi_version=openmpi-1.4.1
-    setenv MPI_HOME $WM_THIRD_PARTY_DIR/$mpi_version
     setenv MPI_ARCH_PATH $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$mpi_version
 
     # Tell OpenMPI where to find its install directory
diff --git a/etc/settings.sh b/etc/settings.sh
index 085744fead..73145ca507 100644
--- a/etc/settings.sh
+++ b/etc/settings.sh
@@ -130,9 +130,6 @@ OpenFOAM)
         _foamAddLib $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH/mpfr-2.4.1/lib
         _foamAddLib $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH/gmp-4.2.4/lib
         ;;
-    Gcc42)
-        export WM_COMPILER_DIR=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH/gcc-4.2.4
-        ;;
     esac
 
     # Check that the compiler directory can be found
@@ -164,12 +161,11 @@ unset compilerBin compilerLib compilerMan compilerInstall
 # Communications library
 # ~~~~~~~~~~~~~~~~~~~~~~
 
-unset MPI_ARCH_PATH
+unset MPI_ARCH_PATH MPI_HOME
 
 case "$WM_MPLIB" in
 OPENMPI)
     mpi_version=openmpi-1.4.1
-    export MPI_HOME=$WM_THIRD_PARTY_DIR/$mpi_version
     export MPI_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$mpi_version
 
     # Tell OpenMPI where to find its install directory
diff --git a/src/parallel/decompose/Allwmake b/src/parallel/decompose/Allwmake
index 2adc739cf1..69a8fff0ee 100755
--- a/src/parallel/decompose/Allwmake
+++ b/src/parallel/decompose/Allwmake
@@ -9,7 +9,7 @@ wmake libso metisDecomp
 
 if [ -d "$FOAM_MPI_LIBBIN" ]
 then
-    ( WM_OPTIONS=${WM_OPTIONS}$WM_MPLIB; wmake libso parMetisDecomp )
+    WM_OPTIONS=${WM_OPTIONS}$WM_MPLIB wmake libso parMetisDecomp
 fi
 
 wmake libso decompositionMethods