academic/g3data: Miscellaneous cleanup and typo fix

Thanks to Serban Udrea for the heads-up on the typo.

academic/g3data/doinst.sh

@@ -1,3 +1,4 @@
 if [ -x /usr/bin/update-desktop-database ]; then
   /usr/bin/update-desktop-database -q usr/share/applications >/dev/null 2>&1
 fi
+

academic/g3data/g3data.SlackBuild

@@ -7,10 +7,19 @@
 
 PRGNAM=g3data
 VERSION=${VERSION:-1.5.3}
-ARCH=${ARCH:-i486}
 BUILD=${BUILD:-1}
 TAG=${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
@@ -25,6 +34,9 @@ elif [ "$ARCH" = "i686" ]; then
 elif [ "$ARCH" = "x86_64" ]; then
   SLKCFLAGS="-O2 -fPIC"
   LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
 fi
 
 set -e 
@@ -49,9 +61,8 @@ CPPFLAGS="$SLKCFLAGS" make
 mkdir -p $PKG/usr/bin $PKG/usr/man/man1
 make install bindir=$PKG/usr/bin mandir=$PKG/usr/man
 
-mkdir -p $PKG/usr/share/applications
-cat $CWD/g3data.desktop > $PKG/usr/share/applications/g3data.destop
-mkdir -p $PKG/usr/share/pixmaps
+mkdir -p $PKG/usr/share/{applications,pixmaps}
+cat $CWD/g3data.desktop > $PKG/usr/share/applications/g3data.desktop
 cat $CWD/g3data.xpm > $PKG/usr/share/pixmaps/g3data.xpm
 
 mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION

academic/g3data/g3data.desktop

@@ -5,4 +5,4 @@ Exec=g3data
 Icon=g3data
 Terminal=false
 Type=Application
-Categories=Science;Graphics;
+Categories=Education;Science;Graphics;