diff -dur popt-1.16.orig/configure.ac popt-1.16/configure.ac
--- popt-1.16.orig/configure.ac	2012-06-18 21:12:58.000000000 +0200
+++ popt-1.16/configure.ac	2012-06-18 21:14:01.185438214 +0200
@@ -46,7 +46,6 @@
 AC_SYS_LARGEFILE
 
 AC_ISC_POSIX
-AM_C_PROTOTYPES
 
 AC_CHECK_HEADERS(float.h fnmatch.h glob.h langinfo.h libintl.h mcheck.h unistd.h)