#!/bin/sh

try_dbm() {
    dbmdef="$1"
    link_possible="$2"
    
    bak_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$CPPFLAGS -D$dbmdef"

    if conftest_compile; then
	CPPFLAGS="$bak_CPPFLAGS"

	for flag in "" $link_possible; do
	    flag="`echo $flag|sed 's/./-l&/'`"
	    echo "trying to link with flags [$flag]" >&5
	    
	    bak_LDFLAGS="$LDFLAGS"
	    LDFLAGS="$LDFLAGS $flag"
	    if conftest_link; then
		# we found it!
		LDFLAGS="$bak_LDFLAGS"
		DBM_LDFLAGS="$flag"
		env_vars="$env_vars DBM_LDFLAGS"
		echo "#define $dbmdef" >> config.h
		echo "#define HAVE_NDBM" >> config.h
		return 0
	    else
		LDFLAGS="$bak_LDFLAGS"
	    fi
	done
	
	return 1
    else
	CPPFLAGS="$bak_CPPFLAGS"
	return 1
    fi
}

find_ndbm() {
    try_dbm DBM_H_GDBM "gdbm gdbm_compat"             && return 0
    try_dbm DBM_H_DEB  "gdbm gdbm_compat"             && return 0
    try_dbm DBM_H_UNIX "db db1 gdbm gdbm_compat ndbm" && return 0
    try_dbm DBM_H_DB_H "db db1 ndbm gdbm gdbm_compat" && return 0
    try_dbm DBM_H_DB   "db db1 gdbm gdbm_compat ndbm" && return 0
    try_dbm DBM_H_DB1  "db1 db"                       && return 0

    return 1
}

cat > conftest.c << EOF
#include <fcntl.h>
#include "find_dbm.h"
int main() {
    DBM *db = dbm_open(".", O_RDONLY, 0); /* will fail at run-time */
    datum my_datum;
    my_datum.dptr = 0;
    my_datum.dsize = (my_datum.dptr == 0 && db == 0);
    return 0;
}
EOF

echo1 "Checking for ndbm.h..."
if find_ndbm; then
    echo2 "yes"
else
    echo2 "no"
fi