Index: devel/boehm-gc/files/patch-freebsd-riscv
===================================================================
--- devel/boehm-gc/files/patch-freebsd-riscv	(nonexistent)
+++ devel/boehm-gc/files/patch-freebsd-riscv	(working copy)
@@ -0,0 +1,33 @@
+diff --git include/private/gcconfig.h include/private/gcconfig.h
+index 0743d8fc..e214587c 100644
+--- include/private/gcconfig.h
++++ include/private/gcconfig.h
+@@ -663,7 +663,7 @@ EXTERN_C_BEGIN
+ #   endif
+ #   define mach_type_known
+ # endif
+-# if defined(__riscv) && defined(LINUX)
++# if defined(__riscv)
+ #   define RISCV
+ #   define mach_type_known
+ # endif
+@@ -2939,6 +2939,19 @@ EXTERN_C_BEGIN
+ #     define LINUX_STACKBOTTOM
+ #     define DYNAMIC_LOADING
+ #   endif
++#   ifdef FREEBSD
++#     define OS_TYPE "FREEBSD"
++#     ifndef GC_FREEBSD_THREADS
++#       define MPROTECT_VDB
++#     endif
++#     define SIG_SUSPEND SIGUSR1
++#     define SIG_THR_RESTART SIGUSR2
++#     define FREEBSD_STACKBOTTOM
++#     define DYNAMIC_LOADING
++      extern char etext[];
++#     define DATASTART GC_FreeBSDGetDataStart(0x1000, (ptr_t)etext)
++#     define DATASTART_USES_BSDGETDATASTART
++#   endif
+ # endif /* RISCV */
+ 
+ #if defined(__GLIBC__) && !defined(DONT_USE_LIBC_PRIVATES)