* autogen.sh: Fix for Solaris 10.

o Replace `test -e` by `test -d` (directory) and `-h`
  (symlink), because pre-POSIX /bin/sh of Solaris 10
  does not support `test -e`.
o Replace the combination of `head` and `sed ...` by
  single sed command `sed -n 1...p`.  GNU libtoolize
  with Solaris 10 /bin/sh complains "Broken Pipe" for
  the closure of stdout by `head`.  Let `sed` receive
  all stdout and discard.

autogen.sh

@@ -99,7 +99,7 @@ check_tool_version ()
   if test "$field"x = x; then
     field=3  # default to 3 for all GNU autotools, after filtering enclosed string
   fi
-  version=`$1 --version | head -1 | sed 's/([^)]*)/()/g' | cut -d ' ' -f $field`
+  version=`$1 --version | sed -n '1s/([^)]*)/()/gp' | cut -d ' ' -f $field`
   version_check=`compare_to_minimum_version $version $4`
   if test "$version_check"x = 0x; then
     echo "ERROR: Your version of the \`$2' tool is too old."
@@ -182,7 +182,7 @@ copy_submodule_files ()
   cp $DLG_SRC_DIR/* src/dlg
 }
 
-if test -e ".git"; then
+if test -d ".git" -o -h ".git"; then
   DLG_INC_DIR=subprojects/dlg/include/dlg
   DLG_SRC_DIR=subprojects/dlg/src/dlg