- workaround for non-existent TMPDIR causing gmake failure: config.status: error: Something went wrong bootstrapping makefile fragments

--- configure.ac.orig	2018-11-12 11:36:13 UTC
+++ configure.ac
@@ -95,8 +95,8 @@ fi])
 
 AC_CONFIG_COMMANDS([dof_free_bit.h],
 [AS_TMPDIR([alberta])
-TMPDIR=${tmp}
-TARGET_NEW=${TMPDIR}/dof_free_bit.h
+TMPDIRx=${tmp}
+TARGET_NEW=${TMPDIRx}/dof_free_bit.h
 TARGET=alberta/src/Common/dof_free_bit.h
 ${SHELL} ${srcdir}/mkdoffreemasks.sh ${BITS} 1 > ${TARGET_NEW}
 if test -f ${TARGET} && cmp ${TARGET} ${TARGET_NEW} > /dev/null 2>&1 ; then
@@ -105,7 +105,7 @@ else
     AC_MSG_NOTICE([Creating ${TARGET}])
     mv -f ${TARGET_NEW} ${TARGET}
 fi
-rm -rf ${TMPDIR}],
+rm -rf ${TMPDIRx}],
 [BITS=$(( ${ac_cv_sizeof_long} * 8 ))])
 
 # Collect the demo programs