--- a/strace.SlackBuild	2018-02-17 22:45:11.482725005 +0200
+++ b/strace.SlackBuild	2018-02-17 22:46:20.017725005 +0200
@@ -68,6 +68,7 @@
 ./configure \
   --prefix=/usr \
   --mandir=/usr/man \
+  --enable-mpers=check \
   --build=$ARCH-slackware-linux || exit 1
 
 make $NUMJOBS || make || exit 1