--- CMakeLists.txt.orig	2016-09-18 02:37:43.092905000 +0200
+++ CMakeLists.txt	2016-09-18 02:40:00.487510000 +0200
@@ -82,6 +82,10 @@
 #TODO check cmake detection
 IF(CMAKE_USE_PTHREADS_INIT)
         SET(SRC ${SRC} pthread_start.c pthread_support.c pthread_stop_world.c)
+        IF ( "HOST" MATCHES .*-.*-bsdsunix.*)
+                MESSAGE("BSDSUniX does not yet fully support threads with Boehm GC.")
+                ADD_DEFINITIONS("-DGC_BSDSUNIX_THREADS")
+        ENDIF()
         IF( "HOST" MATCHES x86-.*-linux.*|ia64-.*-linux.*|i586-.*-linux.*|i686-.*-linux.*|x86_64-.*-linux.*|alpha-.*-linux.*|sparc.*-.*-linux.*)
                 ADD_DEFINITIONS("-DGC_LINUX_THREADS")
                 ADD_DEFINITIONS("-D_REENTRANT")
@@ -128,6 +132,15 @@
                 ADD_DEFINITIONS("-DTHREAD_LOCAL_ALLOC")
                 ADD_DEFINITIONS("-DUSE_COMPILER_TLS")
         ENDIF()
+        IF ( "HOST" MATCHES .*-.*-kbsdsunix.*-gnu)
+                ADD_DEFINITIONS("-DGC_BSDSUNIX_THREADS")
+                ADD_DEFINITIONS("-D_REENTRANT")
+                IF (${enable_parallel_mark})
+                        ADD_DEFINITIONS("-DPARALLEL_MARK")
+                ENDIF()
+                ADD_DEFINITIONS("-DTHREAD_LOCAL_ALLOC")
+                ADD_DEFINITIONS("-DUSE_COMPILER_TLS")
+        ENDIF()
         IF ( "HOST" MATCHES .*-.*-gnu.*)
                 ADD_DEFINITIONS("-DGC_GNU_THREADS")
                 ADD_DEFINITIONS("-D_REENTRANT")