diff --git a/development/rmac/rmac.SlackBuild b/development/rmac/rmac.SlackBuild
index 883d83b114..a304fad8b7 100644
--- a/development/rmac/rmac.SlackBuild
+++ b/development/rmac/rmac.SlackBuild
@@ -8,8 +8,11 @@
 
 # Upstream doesn't do source release tarballs, see git2targz.sh.
 
+# 20180922 bkw:
+# - updated for v1.13.5_20180603, had to add -j1 to make command.
+
 PRGNAM=rmac
-VERSION=${VERSION:-1.8.6_20170829}
+VERSION=${VERSION:-1.13.5_20180603}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 
@@ -49,14 +52,11 @@ rm -rf $PRGNAM-$VERSION
 tar xvf $CWD/$PRGNAM-$VERSION.tar.xz
 cd $PRGNAM-$VERSION
 chown -R root:root .
-find -L . \
- \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
-  -o -perm 511 \) -exec chmod 755 {} \; -o \
- \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
-  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+find -L .  -perm /111 -a \! -perm 755 -a -exec chmod 755 {} \+ -o \
+        \! -perm /111 -a \! -perm 644 -a -exec chmod 644 {} \+
 
 sed -i "s,-O2,$SLKCFLAGS," makefile
-make
+make -j1
 
 # Manual install.
 mkdir -p $PKG/usr/bin $PKG/usr/share/$PRGNAM
diff --git a/development/rmac/rmac.info b/development/rmac/rmac.info
index 9a41a9a83d..2bbf953b6e 100644
--- a/development/rmac/rmac.info
+++ b/development/rmac/rmac.info
@@ -1,9 +1,9 @@
 PRGNAM="rmac"
-VERSION="1.8.6_20170829"
+VERSION="1.13.5_20180603"
 HOMEPAGE="http://atariage.com/forums/topic/264842-rmac-the-grandchild-of-madmac-assembler-finally-gets-6502-support/"
-DOWNLOAD="http://urchlay.naptime.net/~urchlay/src/rmac-1.8.6_20170829.tar.xz \
+DOWNLOAD="http://urchlay.naptime.net/~urchlay/src/rmac-1.13.5_20180603.tar.xz \
           http://urchlay.naptime.net/~urchlay/src/madmac-examples.tar.xz"
-MD5SUM="603805326d105dca2fafd12f9ba81110 \
+MD5SUM="b42fb292daf2f20147bead7dc9fe607d \
         3d6dff2b72815935c322c91277ea5074"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""