Comment improvements.

Rev: configure.ac:1.59.2.5

configure.ac

@@ -798,6 +798,7 @@ if test x$GCC = xyes ; then
     CFLAGS="$CFLAGS -ggdb3"
   fi
   # FIXME: It would be better to actually test if this option works and/or is needed.
+  # Or perhaps use -funsigned-char.
   if "$CC" --version | grep 'gcc.* 4\.' 1>/dev/null 2>&1; then
     CFLAGS="$CFLAGS -Wno-pointer-sign"
   fi
@@ -812,6 +813,7 @@ if test x$GCC = xyes ; then
 
 fi
 
+# Used by contrib/solpkg.sh.in.
 AC_SUBST(BUILD_ARCH, `uname -p`)
 AC_SUBST(BUILD_OSSYS,`uname -s`)
 AC_SUBST(BUILD_OSREV,`uname -r`)