diff -dur rpm-4.5.orig/configure.ac rpm-4.5/configure.ac
--- rpm-4.5.orig/configure.ac	2012-06-19 15:52:36.000000000 +0200
+++ rpm-4.5/configure.ac	2012-06-19 15:54:29.000000000 +0200
@@ -211,7 +211,6 @@
 dnl This test must precede tests of compiler characteristics like
 dnl that for the inline keyword, since it may change the degree to
 dnl which the compiler supports such features.
-AM_C_PROTOTYPES
 AC_C_INLINE
 AC_C_BIGENDIAN
 
Only in rpm-4.5.orig: configure.ac.orig