+# This should have been defined by AC_PROG_CC
+: ${CC:=cc}
+
+# Check for user's environment-breakage by stuffing CFLAGS/CPPFLAGS content
+# into CC. This will not help with broken scripts that wrap the compiler with
+# options, but eliminates a more common category of user confusion.
+AC_MSG_CHECKING(\$CC variable)
+case "$CC" in #(vi
+*[[\ \ ]]-[[IUD]]*)
+ AC_MSG_RESULT(broken)
+ AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
+ # humor him...
+ cf_flags=`echo "$CC" | sed -e 's/^[[^ ]]*[[ ]]//'`
+ CC=`echo "$CC" | sed -e 's/[[ ]].*//'`
+ CF_ADD_CFLAGS($cf_flags)
+ ;;
+*)
+ AC_MSG_RESULT(ok)
+ ;;
+esac
+