I upgraded a stable/8 i386 system and switched from lang/perl5.16 to lang/perl5.20 only to experience problems with swig generated code for AMANDA. I have confirmed this behaviour on stable/9 amd64 too.

I found 17 files containing these three lines:

#ifdef bool
#undef bool
#endif

This results in error messages such as:

Amanda/Application.c: In function 'SWIG_AsCharPtrAndSize':
Amanda/Application.c:1580: error: 'bool' undeclared (first use in this function)
Amanda/Application.c:1580: note: each undeclared identifier is reported only once for each function it appears in
Amanda/Application.c:1580: error: expected ':' before numeric constant

Creating these 17 patches and placing them in /usr/ports/misc/amanda-server/files with names such as patch-local-perl__Amanda__origname.c made the day:

--- perl/Amanda/Application.c.orig      2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Application.c   2014-10-27 08:48:58.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Archive.c.orig  2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Archive.c       2014-10-27 08:49:05.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Cmdline.c.orig  2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Cmdline.c       2014-10-27 08:49:13.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Config.c.orig   2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Config.c        2014-10-27 08:49:19.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Debug.c.orig    2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Debug.c 2014-10-27 08:49:25.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Device.c.orig   2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Device.c        2014-10-27 08:49:30.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Disklist.c.orig 2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Disklist.c      2014-10-27 08:49:36.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Feature.c.orig  2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Feature.c       2014-10-27 08:49:41.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Header.c.orig   2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Header.c        2014-10-27 08:49:48.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Logfile.c.orig  2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Logfile.c       2014-10-27 08:49:53.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/MainLoop.c.orig 2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/MainLoop.c      2014-10-27 08:49:59.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/NDMP.c.orig     2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/NDMP.c  2014-10-27 08:50:19.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Tapelist.c.orig 2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Tapelist.c      2014-10-27 08:50:24.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Tests.c.orig    2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Tests.c 2014-10-27 09:01:12.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Util.c.orig     2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Util.c  2014-10-27 09:01:17.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/Xfer.c.orig     2012-07-25 17:59:54.000000000 +0200
+++ perl/Amanda/Xfer.c  2014-10-27 09:01:22.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif
--- perl/Amanda/XferServer.c.orig       2012-07-25 17:59:55.000000000 +0200
+++ perl/Amanda/XferServer.c    2014-10-27 09:01:29.000000000 +0100
@@ -1450,9 +1450,6 @@
 #ifdef eof
   #undef eof
 #endif
-#ifdef bool
-  #undef bool
-#endif
 #ifdef close
   #undef close
 #endif

These patches are available as a single file at http://ximalas.info/~trond/create-zfs/canmount/patch-local-amanda-perl5.20.