diff --git a/scripts/parse-config b/scripts/parse-config
index 8c23ceeb6..f88088a03 100644
--- a/scripts/parse-config
+++ b/scripts/parse-config
@@ -90,14 +90,18 @@ fi
 
 export PATH="$base/build/$ROCKCFG_ID/ROCK/$toolsdir/bin:$PATH"
 export PATH="$base/build/$ROCKCFG_ID/ROCK/$toolsdir/wrapper:$PATH"
-export LC_ALL=C ; unset LANG ; umask 022
+unset LANG ${!LC_*}; export LC_ALL=C; umask 022
 
 export BUILDCC="cc"   BUILD_CC="cc"   HOSTCC="cc"   HOST_CC="cc"
 export BUILDCXX="c++" BUILD_CXX="c++" HOSTCXX="c++" HOST_CXX="c++"
 
-unset CPP ARFLAGS ASFLAGS CFLAGS CXXFLAGS CPPFLAGS FFLAGS LDFLAGS 
+unset CPP ARFLAGS ASFLAGS CFLAGS CXXFLAGS CPPFLAGS FFLAGS LDFLAGS
 unset LD_LIBRARY_PATH LD_PRELOAD FLWRAPPER C_INCLUDE_PATH CONFIG_SITE
-unset DISPLAY
+unset DISPLAY BASH_ENV CDPATH GLOBIGNORE IFS MAIL MAILPATH
+unset POSIXLY_CORRECT PROMPT_COMMAND TIMEFORMAT TMOUT
+
+IFS=$' \t\n'
+set +o posix
 
 export STRIP_WRAPPER_MYPATH="$base/build/$ROCKCFG_ID/ROCK/$toolsdir/wrapper"
 export STRIP_WRAPPER_NOLOOP=0