add check for deps packages and REBUILD var

Signed-off-by: Ryan P.C. McQuen <ryan.q@linux.com>

build-deps.sh

@@ -27,11 +27,18 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-# These need set here:
+# These need to be set here:
 INST=1
 TMP=${TMP:-/tmp}
 ROOT=$(pwd)
 
+## Allow a rebuild of all dependencies,
+## even if they are already installed.
+##
+## Run:
+##   REBUILD=yes ./build-deps.sh
+REBUILD=${REBUILD:-no}
+
 # Loop for all packages
 for dir in \
   Deps/GraphicsMagick \
@@ -48,6 +55,7 @@ for dir in \
   # Get the package name
   package=$(echo $dir | cut -f2- -d /)
 
+  if [ -z "`find /var/log/packages/ -name *$package-*`" ] || [ "${REBUILD}" = "yes" ]; then
     # Change to package directory
     cd $ROOT/$dir || exit 1
 
@@ -71,4 +79,7 @@ for dir in \
 
     # back to original directory
     cd $ROOT
+  else
+    echo "$package already installed."
+  fi
 done