fi
AC_PROG_LN_S
+# We need the physical current working directory. We cannot use the
+# "pwd -P" shell builtin since that's not portable. Instead we try to
+# find a pwd binary. Note that assigning to the PWD environment
+# variable might have some interesting side effects, so we don't do
+# that.
+AC_PATH_PROG(PWD_P, pwd, no)
+if test "$PWD_P" = no; then
+ AC_MSG_ERROR(*** A pwd binary could not be found.)
+fi
+
# These programs are version sensitive.
AC_REQUIRE([AC_CHECK_TOOL_PREFIX])dnl
AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,