Don't forget to create the dynloader files...

src/backend/port/dynloader/freebsd.c

@@ -0,0 +1,104 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *	  notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *	  notice, this list of conditions and the following disclaimer in the
+ *	  documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *	  must display the following acknowledgement:
+ *		This product includes software developed by the University of
+ *		California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *	  may be used to endorse or promote products derived from this software
+ *	  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.	IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)dl.c	5.4 (Berkeley) 2/23/91";
+
+#endif	 /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <nlist.h>
+#include <link.h>
+#include <dlfcn.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "dynloader.h"
+
+static char error_message[BUFSIZ];
+
+char *
+BSD44_derived_dlerror(void)
+{
+	static char ret[BUFSIZ];
+
+	strcpy(ret, error_message);
+	error_message[0] = 0;
+	return (ret[0] == 0) ? (char *) NULL : ret;
+}
+
+void *
+BSD44_derived_dlopen(const char *file, int num)
+{
+#if defined(__mips__) || (defined(__NetBSD__) && defined(vax))
+	sprintf(error_message, "dlopen (%s) not supported", file);
+	return NULL;
+#else
+	void	   *vp;
+
+	if ((vp = dlopen((char *) file, num)) == (void *) NULL)
+		sprintf(error_message, "dlopen (%s) failed", file);
+	return vp;
+#endif
+}
+
+void *
+BSD44_derived_dlsym(void *handle, const char *name)
+{
+#if defined(__mips__) || (defined(__NetBSD__) && defined(vax))
+	sprintf(error_message, "dlsym (%s) failed", name);
+	return NULL;
+#else
+	void	   *vp;
+	char		buf[BUFSIZ];
+
+	if (*name != '_')
+	{
+		sprintf(buf, "_%s", name);
+		name = buf;
+	}
+	if ((vp = dlsym(handle, (char *) name)) == (void *) NULL)
+		sprintf(error_message, "dlsym (%s) failed", name);
+	return vp;
+#endif
+}
+
+void
+BSD44_derived_dlclose(void *handle)
+{
+#if defined(__mips__) || (defined(__NetBSD__) && defined(vax))
+#else
+	dlclose(handle);
+#endif
+}

src/backend/port/dynloader/freebsd.h

@@ -0,0 +1,48 @@
+/*-------------------------------------------------------------------------
+ *
+ * port-protos.h--
+ *	  port-specific prototypes for NetBSD 1.0
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: freebsd.h,v 1.1 1998/10/27 04:41:29 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PORT_PROTOS_H
+#define PORT_PROTOS_H
+
+#include <sys/types.h>
+#include <nlist.h>
+#include <link.h>
+
+#include "postgres.h"
+
+#include "fmgr.h"				/* for func_ptr */
+#include "utils/dynamic_loader.h"
+
+/* dynloader.c */
+/*
+ * Dynamic Loader on NetBSD 1.0.
+ *
+ * this dynamic loader uses the system dynamic loading interface for shared
+ * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
+ * library as the file to be dynamically loaded.
+ *
+ * agc - I know this is all a bit crufty, but it does work, is fairly
+ * portable, and works (the stipulation that the d.l. function must
+ * begin with an underscore is fairly tricky, and some versions of
+ * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
+ */
+#define		   pg_dlopen(f)    BSD44_derived_dlopen(f, 1)
+#define		   pg_dlsym		   BSD44_derived_dlsym
+#define		   pg_dlclose	   BSD44_derived_dlclose
+#define		   pg_dlerror	   BSD44_derived_dlerror
+
+char	   *BSD44_derived_dlerror(void);
+void	   *BSD44_derived_dlopen(const char *filename, int num);
+void	   *BSD44_derived_dlsym(void *handle, const char *name);
+void		BSD44_derived_dlclose(void *handle);
+
+#endif	 /* PORT_PROTOS_H */