diff --git a/academic/gcalctool/gcalctool.SlackBuild b/academic/gcalctool/gcalctool.SlackBuild
index cd4064a304..4be2cdff1e 100644
--- a/academic/gcalctool/gcalctool.SlackBuild
+++ b/academic/gcalctool/gcalctool.SlackBuild
@@ -26,11 +26,11 @@
 PRGNAM=gcalctool
 VERSION=${VERSION:-6.6.2}
 BUILD=${BUILD:-1}
-TAG=${TAG=_SBo}
+TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
-    i?86) ARCH=i486 ;;
+    i?86) ARCH=i586 ;;
     arm*) ARCH=arm ;;
        *) ARCH=$( uname -m ) ;;
   esac
@@ -41,8 +41,8 @@ TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
 
-if [ "$ARCH" = "i486" ]; then
-  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
   LIBDIRSUFFIX=""
 elif [ "$ARCH" = "i686" ]; then
   SLKCFLAGS="-O2 -march=i686 -mtune=i686"