diff --git a/Jamfile b/Jamfile
index e9a41f273c..1b4c8da18b 100644
--- a/Jamfile
+++ b/Jamfile
@@ -145,6 +145,9 @@ if $(HAIKU_INCLUDE_3RDPARTY) {
 	SubInclude HAIKU_TOP 3rdparty ;
 }
 
+# Perform deferred SubIncludes.
+ExecuteDeferredSubIncludes ;
+
 # reset subdir
 SubDir HAIKU_TOP ;
 
@@ -153,6 +156,3 @@ include [ FDirName $(HAIKU_BUILD_RULES_DIR) HaikuImage ] ;
 include [ FDirName $(HAIKU_BUILD_RULES_DIR) NetBootArchive ] ;
 include [ FDirName $(HAIKU_BUILD_RULES_DIR) FloppyBootImage ] ;
 include [ FDirName $(HAIKU_BUILD_RULES_DIR) CDBootImage ] ;
-
-# Perform deferred SubIncludes.
-ExecuteDeferredSubIncludes ;
diff --git a/build/jam/ConfigRules b/build/jam/ConfigRules
index 6e9429852a..2f33a8106d 100644
--- a/build/jam/ConfigRules
+++ b/build/jam/ConfigRules
@@ -163,6 +163,6 @@ rule PrepareConfigVariables
 
 # Some config variables that should be set up automatically for subdirs.
 AUTO_SET_UP_CONFIG_VARIABLES +=
-	CCFLAGS C++FLAGS DEBUG DEFINES HDRS LINKFLAGS OPTIM OPTIMIZE
+	CCFLAGS C++FLAGS DEBUG DEFINES HDRS JAMFILE LINKFLAGS OPTIM OPTIMIZE
 	SYSHDRS WARNINGS
 ;
diff --git a/build/jam/MiscRules b/build/jam/MiscRules
index 625899e66c..5c1645b64c 100644
--- a/build/jam/MiscRules
+++ b/build/jam/MiscRules
@@ -90,15 +90,22 @@ rule MakeLocateDebug
 # The variable used to collect the deferred SubIncludes.
 HAIKU_DEFERRED_SUB_INCLUDES = ;
 
-rule DeferredSubInclude params
+rule DeferredSubInclude params : jamfile : scope
 {
-	# DeferredSubInclude <subdir tokens> ;
+	# DeferredSubInclude <subdir tokens> [ : <jamfile name>  [ : <scope> ] ] ;
 	#
-	# Takes the same parameter as SubInclude. The the subdirectory referred to
-	# by <subdir tokens> will be included when ExecuteDeferredSubIncludes is
-	# invoked, i.e. at the end of the root Jamfile.
+	# Takes the same directory tokens parameter as SubInclude plus an optional
+	# alternative Jamfile name. The the subdirectory referred to by
+	# <subdir tokens> will be included when ExecuteDeferredSubIncludes is
+	# invoked, i.e. at the end of the root Jamfile. The <jamfile name> parameter
+	# specifies the name of the Jamfile to include. By default it is "Jamfile".
+	# The <scope> parameter can be "global" (default) or "local", specifying
+	# whether the alternative Jamfile name shall also be used for subdirectories.
 
 	HAIKU_DEFERRED_SUB_INCLUDES += "/" $(params) ;
+	if $(jamfile) {
+		SetConfigVar JAMFILE : $(params) : $(jamfile) : $(scope) ;
+	}
 }
 
 rule ExecuteDeferredSubIncludes
diff --git a/build/jam/UserBuildConfig.ReadMe b/build/jam/UserBuildConfig.ReadMe
index 4786ffa3c8..5f440341a2 100644
--- a/build/jam/UserBuildConfig.ReadMe
+++ b/build/jam/UserBuildConfig.ReadMe
@@ -158,7 +158,7 @@ AddTargetVariableToScript test.inc : fs_shell_command : fsShellCommand ;
 AddTargetVariableToScript test.inc : <build>rc ;
 
 
-# Optimizing Jamfile Parsing Times
+# Optimizing Jamfile Parsing Times / Third Party Inclusion
 
 # Setting this variable will prevent the root Jamfile to include the Jamfile
 # in the src directory. Instead only the directories required for building the
@@ -172,6 +172,13 @@ HAIKU_DONT_INCLUDE_SRC = 1 ;
 DeferredSubInclude HAIKU_TOP src tests add-ons kernel file_systems
 	userlandfs ;
 
+# Schedule src/3rdparty/myproject/Jamfile.haiku for later inclusion. The "local"
+# parameter specifies that the alternative Jamfile name shall not be used for
+# any subdirectory of the given directory (i.e. "Jamfile" will be used as
+# usual). Omitting this parameter or specifying "global" will cause the given
+# name to be used recursively.
+DeferredSubInclude HAIKU_TOP src 3rdparty myproject : Jamfile.haiku : local ;
+
 
 # Copy the posix test suite onto the image (or on the installation) into 
 # "home/posixtestsuite" directory, including the run script.