diff --git a/acinclude.m4 b/acinclude.m4
index 97aed8aa..6974c0c1 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -181,8 +181,6 @@ AH_TOP([
 ])
 
 AH_TEMPLATE([C_HAS_ATTRIBUTE],[Determines if the compilers supports attributes for structures.])
-AH_TEMPLATE([C_DEBUG],[Enable the internal debugger.])
-AH_TEMPLATE([C_SSHOT],[Enable the screenshot support.])
 
 AH_BOTTOM([#define INLINE inline])
 
diff --git a/configure.in b/configure.in
index 2a03de91..a048585c 100644
--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,7 @@
 dnl Init.
 AC_INIT(dosbox,0.57)
 AC_CONFIG_SRCDIR(README)
+AC_RREREQ(2.50)
 
 dnl Detect the canonical host and target build environment
 AC_CANONICAL_HOST