===================================================================
RCS file: /cvs/mandoc/configure,v
retrieving revision 1.41
retrieving revision 1.43
diff -u -p -r1.41 -r1.43
--- mandoc/configure	2016/07/15 15:08:37	1.41
+++ mandoc/configure	2016/07/19 13:36:13	1.43
@@ -35,7 +35,8 @@ MANPATH_DEFAULT="/usr/share/man:/usr/X11R6/man:/usr/lo
 OSNAME=
 
 CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | env -i make -f -`
-CFLAGS="-g -W -Wall -Wstrict-prototypes -Wno-unused-parameter -Wwrite-strings"
+CFLAGS="-g -W -Wall -Wmissing-prototypes -Wstrict-prototypes -Wwrite-strings"
+CFLAGS="${CFLAGS} -Wno-unused-parameter"
 LDADD=
 LDFLAGS=
 LD_OHASH=
@@ -284,8 +285,9 @@ cat << __HEREDOC__
 #error "Do not use C++.  See the INSTALL file."
 #endif
 
-#ifndef MANDOC_CONFIG_H
-#define MANDOC_CONFIG_H
+#if !defined(__GNUC__) || (__GNUC__ < 4)
+#define __attribute__(x)
+#endif
 
 #if defined(__linux__) || defined(__MINT__)
 #define _GNU_SOURCE	/* See test-*.c what needs this. */
@@ -389,9 +391,6 @@ fi
 
 [ ${HAVE_VASPRINTF} -eq 0 ] && \
 	echo "extern	int	  vasprintf(char **, const char *, va_list);"
-
-echo
-echo "#endif /* MANDOC_CONFIG_H */"
 
 echo "config.h: written" 1>&2
 echo "config.h: written" 1>&3