bugfix for an issue with recent autoconf versions on Ubuntu 10

[u/mrichter/AliRoot.git] / HLT / acinclude.m4

diff --git a/HLT/acinclude.m4 b/HLT/acinclude.m4
index 8cb3d72324e527c630f28e64bf414cf8c03d06cc..b80b4691978ab6340a326af27beab1f8449359a8 100644 (file)
--- a/HLT/acinclude.m4
+++ b/HLT/acinclude.m4
@@ -276,7 +276,9 @@ AC_ARG_ENABLE([$1],
      save_LIBS="$LIBS"
      CPPFLAGS="$save_CPPFLAGS [$3]"
 
-     AC_CHECK_HEADERS([$2], [], [enable_module="missheader"])
+     if test "x[$2]" != "x"; then
+        AC_CHECK_HEADERS([$2], [], [enable_module="missheader"])
+     fi
 
      dnl ==========================================================================
      dnl