[...Took from jylefort's comment in email with a bit tweak...]

Mono will using Gamin or FAM by default if it exists in the runtime. If either
doesn't exist then it will use KeventWatcher.cs. Add auto-check on Gamin and
FAM for dependency. Bump the PORTREVISION to have the fix of kqueue.

Rationale:

	- KeventWatcher.cs is naive, it does not report changes made to
	  files within a monitored directory [1]
	- KeventWatcher.cs is implemented in C#, it is therefore slower than
	  Gamin or FAM, which are implemented in C and C++, respectively

[1] this is a bug which should be reported to the vendor

Testing, using the attached WatchTest.cs:

  With KeventWatcher.cs:

	$ mono WatchTest.exe /somedir &
	[1] 89857
	$ touch /somedir/foo
	OnCreatedEvent /somedir/foo
	$ echo foo >> /somedir/foo
	<nothing happens>

  With Gamin:

	$ mono WatchTest.exe /somedir &
	[1] 89889
	$ touch /somedir/foo
	OnCreatedEvent /somedir/foo
	$ echo foo >> /somedir/foo
	OnChangedEvent /somedir/foo

Submitted by:	jylefort

2 files changed, 41 insertions, 1 deletions

diff --git a/lang/mono/Makefile b/lang/mono/Makefile
index f33bc04b7c24..3f2512995134 100644
--- a/lang/mono/Makefile
+++ b/lang/mono/Makefile
@@ -8,7 +8,7 @@
 
 PORTNAME=	mono
 PORTVERSION=	1.1.7
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	lang
 MASTER_SITES=	http://www.go-mono.com/sources/mono-1.1/
 
@@ -52,6 +52,12 @@ IGNORE=	Does not work on 4.X and 5.X before 503000
 EXTRA_PATCHES+=	${FILESDIR}/extra-patch-support_mph.h
 .endif
 
+.if exists(${LOCALBASE}/lib/libgamin-1.so)
+LIB_DEPENDS+=	fam.0:${PORTSDIR}/devel/gamin
+.elif exists(${LOCALBASE}/lib/libfam.so)
+LIB_DEPENDS+=	fam.0:${PORTSDIR}/devel/fam
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e 's|%%X11BASE%%|${X11BASE}|g' \
 		${WRKSRC}/mono/metadata/assembly.c
diff --git a/lang/mono/files/patch-mono_metadata_filewatcher.c b/lang/mono/files/patch-mono_metadata_filewatcher.c
new file mode 100644
index 000000000000..3d36d76cdc31
--- /dev/null
+++ b/lang/mono/files/patch-mono_metadata_filewatcher.c
@@ -0,0 +1,34 @@
+--- mono/metadata/filewatcher.c.orig	Wed Jun  1 06:25:57 2005
++++ mono/metadata/filewatcher.c	Wed Jun  1 06:27:17 2005
+@@ -97,9 +97,6 @@
+ gint
+ ves_icall_System_IO_FSW_SupportsFSW (void)
+ {
+-#if HAVE_KQUEUE
+-	return 3;
+-#else
+ 	GModule *fam_module;
+ 	gchar *filename;
+ 
+@@ -109,13 +106,19 @@
+ 	fam_module = g_module_open (filename, G_MODULE_BIND_LAZY);
+ 	g_free (filename);
+ 	if (fam_module == NULL)
+-		return 0;
++		goto nofam;
+ 
+ 	g_module_symbol (fam_module, "FAMNextEvent", (gpointer *) &FAMNextEvent);
+ 	if (FAMNextEvent == NULL)
+-		return 0;
++		goto nofam;
+ 
+ 	return 2;
++
++ nofam:
++#if HAVE_KQUEUE
++	return 3;
++#else
++	return 0;
+ #endif
+ }
+