diff --git a/academic/sympy/sympy.SlackBuild b/academic/sympy/sympy.SlackBuild
index c9a05fe1ad..c9de4b415b 100644
--- a/academic/sympy/sympy.SlackBuild
+++ b/academic/sympy/sympy.SlackBuild
@@ -7,10 +7,17 @@
 
 PRGNAM=sympy
 VERSION=${VERSION:-0.6.7}
-ARCH=${ARCH:-noarch}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
 CWD=$(pwd)
 TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM