Outcome of discussions with Lenz and Monty about handling ccache in the build commands.

BUILD/SETUP.sh:
  Quote $CXX to make a test work even if CXX had spaces in it.
  Automatically add ccache to CC and CXX if ccache is present.
configure.in:
  Accept "ccache gcc" in the test.

BUILD/SETUP.sh

@@ -71,6 +71,22 @@ else
   make=make
 fi
 
-if test -z $CXX ; then
+if test -z "$CXX" ; then
   CXX=gcc
 fi
+
+# If ccache (a compiler cache which reduces build time)
+# (http://samba.org/ccache) is installed, use it.
+# We use 'grep' and hope 'grep' will work as expected
+# (returns 0 if finds lines)
+if ccache -V > /dev/null 2>&1
+then
+  if ! (echo "$CC" | grep "ccache" > /dev/null)
+  then
+    CC="ccache $CC"
+  fi
+  if ! (echo "$CXX" | grep "ccache" > /dev/null)
+  then
+    CXX="ccache $CXX"
+  fi
+fi

configure.in

@@ -361,7 +361,7 @@ then
   # we will gets some problems when linking static programs.
   # The following code is used to fix this problem.
 
-  if test "$CXX" = "gcc"
+  if test "$CXX" = "gcc" -o "$CXX" = "ccache gcc"
   then
     if $CXX -v 2>&1 | grep 'version 3' > /dev/null 2>&1
     then