diff --git a/system/anacron/anacron.SlackBuild b/system/anacron/anacron.SlackBuild
index 392d00077f..7409cd765b 100644
--- a/system/anacron/anacron.SlackBuild
+++ b/system/anacron/anacron.SlackBuild
@@ -24,10 +24,19 @@
 
 PRGNAM=anacron
 VERSION=2.3
-ARCH=${ARCH:-i486} 
 BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
+# Automatically determine the architecture we're building on:
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
 CWD=$(pwd)
 TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM