diff --git a/Allwmake.firstInstall b/Allwmake.firstInstall
index 94acee1e4..de8eaea35 100755
--- a/Allwmake.firstInstall
+++ b/Allwmake.firstInstall
@@ -80,6 +80,7 @@ then
 fi
 
 # build ThirdParty sources that depend on main installation
+export WM_NCOMPPROCS=1
 ( cd $WM_THIRD_PARTY_DIR && ./AllMake.post )
 
 # ----------------------------------------------------------------- end-of-file
diff --git a/etc/bashrc b/etc/bashrc
index 6aad1f6ce..4d8c7ef55 100644
--- a/etc/bashrc
+++ b/etc/bashrc
@@ -1,3 +1,4 @@
+#!/bin/bash
 #----------------------------------*-sh-*--------------------------------------
 # =========                 |
 # \\      /  F ield         | foam-extend: Open Source CFD
diff --git a/etc/settings.sh b/etc/settings.sh
index 698b678df..455bcb68b 100644
--- a/etc/settings.sh
+++ b/etc/settings.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 #----------------------------------*-sh-*--------------------------------------
 # =========                 |
 # \\      /  F ield         | foam-extend: Open Source CFD