Enable build for FreeBSD (part 1/2)

Adopted from Michael Beer -- GH pull-request #232 with minor changes:

*   rebased on master,
*   removed trailing whitespace,
*   don't explicitly change saved configuration defaults (wscript)
*   moved sys/wait (WNOHANG) to header include
*   separate changes in GUI and lib

libs/ardour/route_group.cc

@@ -32,6 +32,7 @@
 #include "ardour/route.h"
 #include "ardour/route_group.h"
 #include "ardour/session.h"
+#include "ardour/debug.h"
 
 #include "i18n.h"
 

libs/ardour/session.cc

@@ -3459,7 +3459,7 @@ Session::add_routes_inner (RouteList& new_routes, bool input_auto_connect, bool
 			}
 		}
 
-#ifndef __APPLE__
+#if !defined(__APPLE__) && !defined(__FreeBSD__)
 		/* clang complains: 'operator<<' should be declared prior to the call site or in an associated namespace of one of its
 		 * arguments std::ostream& operator<<(std::ostream& o, ARDOUR::PresentationInfo const& rid)"
 		 */

libs/ardour/session_state.cc

@@ -39,7 +39,7 @@
 #include <sys/vfs.h>
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__FreeBSD__)
 #include <sys/param.h>
 #include <sys/mount.h>
 #endif
@@ -2262,7 +2262,7 @@ Session::save_template (string template_name, bool replace_existing)
 void
 Session::refresh_disk_space ()
 {
-#if __APPLE__ || (HAVE_SYS_VFS_H && HAVE_SYS_STATVFS_H)
+#if __APPLE__ || __FreeBSD__ || (HAVE_SYS_VFS_H && HAVE_SYS_STATVFS_H)
 
 	Glib::Threads::Mutex::Lock lm (space_lock);
 

libs/midi++2/midi++/ipmidi_port.h

@@ -23,7 +23,7 @@
 #include <iostream>
 #if defined(PLATFORM_WINDOWS)
 #include <winsock.h>
-#elif defined(__FREE_BSD__)
+#elif defined(__FreeBSD__)
 #include <netinet/in.h>
 #include <sys/socket.h>
 #include <sys/_sockaddr_storage.h>

libs/pbd/cpus.cc

@@ -43,10 +43,14 @@ hardware_concurrency()
 {
 #if defined(PTW32_VERSION) || defined(__hpux)
         return pthread_num_processors_np();
-#elif defined(__APPLE__) || defined(__FreeBSD__)
+#elif defined(__APPLE__)
         int count;
         size_t size=sizeof(count);
         return sysctlbyname("hw.physicalcpu",&count,&size,NULL,0)?0:count;
+#elif defined(__FreeBSD__)
+        int count;
+        size_t size=sizeof(count);
+        return sysctlbyname("hw.ncpu",&count,&size,NULL,0)?0:count;
 #elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
         int const count=sysconf(_SC_NPROCESSORS_ONLN);
         return (count>0)?count:0;

libs/pbd/pbd/floating.h

@@ -28,6 +28,7 @@
 
 #include <stdint.h>
 
+#include <cstdlib> // abs(int)
 #include <cmath>
 
 #include "pbd/libpbd_visibility.h"

libs/pbd/pbd/system_exec.h

@@ -37,6 +37,9 @@
 #undef interface // VKamyshniy: to avoid "include/giomm-2.4/giomm/dbusmessage.h:270:94: error: expected ',' or '...' before 'struct'"
 #endif
 
+#else // posix
+#include <sys/types.h>
+#include <sys/wait.h> /* WNOHANG is part of the exposed API */
 #endif
 
 #include <string>

libs/ptformat/ptfformat.cc

@@ -15,6 +15,7 @@
 */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string>
 #include <string.h>
 #include <assert.h>