It probably is better not to hide warning messages. Removed spaces from

AC_DEFINE( SYMBOL ) -> AC_DEFINE(SYMBOL)

autogen.sh

@@ -16,31 +16,29 @@ if [ $AUTO_MAKE_VERSION -ge 14 ]; then
     fi
 fi
 echo "Running aclocal $ACLOCAL_OPTS"
-aclocal $ACLOCAL_OPTS 2> autogen.err
+aclocal $ACLOCAL_OPTS
 
 echo "Running autoheader"
-autoheader 2>> autogen.err
+autoheader
 if [ ! -e src/Include/config.h.in ]; then
     echo "ERROR: autoheader didn't create simgear/simgear_config.h.in!"
-    echo "Aborting ... consulte autogen.err for details."
     exit 1
 fi    
 
 echo -n "Running automake"
 if [ $OSTYPE = "IRIX" -o $OSTYPE = "IRIX64" ]; then
     echo " --add-missing --include-deps"
-    automake --add-missing --include-deps 2>> autogen.err
+    automake --add-missing --include-deps
 else
     echo " --add-missing"
-    automake --add-missing 2>> autogen.err
+    automake --add-missing
 fi
 
 echo "Running autoconf"
-autoconf 2>> autogen.err
+autoconf
 
 if [ ! -e configure ]; then
     echo "ERROR: configure was not created!"
-    echo "Aborting ... consulte autogen.err for details."
     exit 1
 fi
 
@@ -66,5 +64,3 @@ fi
 
 echo "Now you are ready to run './configure'"
 echo "======================================"
-
-rm -f autogen.err