diff --git a/depends/packages/capnp.mk b/depends/packages/capnp.mk
index 6d792db7113..0c211cbc455 100644
--- a/depends/packages/capnp.mk
+++ b/depends/packages/capnp.mk
@@ -9,6 +9,7 @@ define $(package)_set_vars :=
   $(package)_config_opts := -DBUILD_TESTING=OFF
   $(package)_config_opts += -DWITH_OPENSSL=OFF
   $(package)_config_opts += -DWITH_ZLIB=OFF
+  $(package)_cxxflags += -ffile-prefix-map=$$($(package)_extract_dir)=/usr
 endef
 
 define $(package)_config_cmds
diff --git a/depends/packages/libmultiprocess.mk b/depends/packages/libmultiprocess.mk
index c292c49bfba..a181e05100b 100644
--- a/depends/packages/libmultiprocess.mk
+++ b/depends/packages/libmultiprocess.mk
@@ -13,6 +13,7 @@ ifneq ($(host),$(build))
 $(package)_config_opts := -DCAPNP_EXECUTABLE="$$(native_capnp_prefixbin)/capnp"
 $(package)_config_opts += -DCAPNPC_CXX_EXECUTABLE="$$(native_capnp_prefixbin)/capnpc-c++"
 endif
+$(package)_cxxflags += -ffile-prefix-map=$$($(package)_extract_dir)=/usr
 endef
 
 define $(package)_config_cmds
diff --git a/depends/toolchain.cmake.in b/depends/toolchain.cmake.in
index c733c81edf7..d805c1c4f9d 100644
--- a/depends/toolchain.cmake.in
+++ b/depends/toolchain.cmake.in
@@ -168,7 +168,8 @@ endif()
 
 if("@multiprocess@" STREQUAL "1")
   set(WITH_MULTIPROCESS ON CACHE BOOL "")
-  set(LibmultiprocessNative_DIR "${CMAKE_FIND_ROOT_PATH}/native/lib/cmake/Libmultiprocess" CACHE PATH "")
+  set(Libmultiprocess_ROOT "${CMAKE_CURRENT_LIST_DIR}" CACHE PATH "")
+  set(LibmultiprocessNative_ROOT "${CMAKE_CURRENT_LIST_DIR}/native" CACHE PATH "")
 else()
   set(WITH_MULTIPROCESS OFF CACHE BOOL "")
 endif()