diff --git a/bash.spec b/bash.spec
index 0521da09..33e4bf7b 100644
--- a/bash.spec
+++ b/bash.spec
@@ -21,6 +21,8 @@
 %else
 %bcond_without alternatives
 %endif
+# Parallel builds do not work!
+%global         _smp_mflags -j1
 
 %define         bextend %{nil}
 %define         bversion 5.1
@@ -224,13 +226,12 @@ Legacy usrmove helper files for the build system. Do not install.
 
 %prep
 %if %{with sjis}
-echo -e '\033[1m\033[31mWarning: Shift JIS support is enabled\033[m'
+%{warn:Shift JIS support is enabled}
 %else
-echo -e '\033[1m\032[31mShift JIS support disabled\033[m'
+%{echo:Shift JIS support disabled}
 %endif
 %setup -q -n bash-%{bversion}%{bextend} -b1
 typeset -i level
-set +x
 for patch in ../bash-%{bversion}-patches/*-*[0-9]; do
     test -e $patch || break
 
@@ -245,7 +246,6 @@ for patch in ../bash-%{bversion}-patches/*-*[0-9]; do
     echo Patch $patch
     patch -s -p$level < $patch
 done
-set -x
 %patch1   -b .manual
 %patch3   -b .2.4.4
 %patch4   -b .evalexp
@@ -452,23 +452,23 @@ test ${rl1[2]} = ${rl2[2]} || exit 1
   profilecflags=CFLAGS="$CFLAGS %{cflags_profile_generate}"
 %endif
   makeopts="Machine=${HOSTTYPE} OS=${OSTYPE} VENDOR=${VENDOR} MACHTYPE=${MACHTYPE}"
-  make $makeopts "$profilecflags" \
+  %make_build $makeopts "$profilecflags" \
 	all printenv recho zecho xcase
   TMPDIR=$(mktemp -d /tmp/bash.XXXXXXXXXX) || exit 1
   > $SCREENLOG
   tail -q -s 0.5 -f $SCREENLOG & pid=$!
   env -i HOME=$PWD TERM=$TERM LD_LIBRARY_PATH=$LD_RUN_PATH TMPDIR=$TMPDIR \
 	SCREENRC=$SCREENRC SCREENDIR=$SCREENDIR \
-	screen -D -m make TESTSCRIPT=%{SOURCE4} check
+	screen -D -m %make_build TESTSCRIPT=%{SOURCE4} check
   kill -TERM $pid
 %if 0%{?do_profiling}
   rm -f jobs.gcda
   profilecflags=CFLAGS="$CFLAGS %{cflags_profile_feedback} -fprofile-correction"
   clean=clean
 %endif
-  make $makeopts "$profilecflags" $clean all
-  make $makeopts -C examples/loadables/
-  make $makeopts documentation
+  %make_build $makeopts "$profilecflags" $clean all
+  %make_build $makeopts -C examples/loadables/
+  %make_build $makeopts documentation
 
 %install
   %make_install